Export clang-format16 via ydblib project

6e6be3a95868fde888d801b7590af4044049563f

1 files changed, 8488 insertions, 0 deletions

diff --git a/contrib/libs/clang16/lib/Driver/ToolChains/Clang.cpp b/contrib/libs/clang16/lib/Driver/ToolChains/Clang.cpp
new file mode 100644
index 0000000000..a66b4f2971
--- /dev/null
+++ b/contrib/libs/clang16/lib/Driver/ToolChains/Clang.cpp
@@ -0,0 +1,8488 @@
+//===-- Clang.cpp - Clang+LLVM ToolChain Implementations --------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Clang.h"
+#include "AMDGPU.h"
+#include "Arch/AArch64.h"
+#include "Arch/ARM.h"
+#include "Arch/CSKY.h"
+#include "Arch/LoongArch.h"
+#include "Arch/M68k.h"
+#include "Arch/Mips.h"
+#include "Arch/PPC.h"
+#include "Arch/RISCV.h"
+#include "Arch/Sparc.h"
+#include "Arch/SystemZ.h"
+#include "Arch/VE.h"
+#include "Arch/X86.h"
+#include "CommonArgs.h"
+#include "Hexagon.h"
+#include "MSP430.h"
+#include "PS4CPU.h"
+#include "clang/Basic/CLWarnings.h"
+#include "clang/Basic/CharInfo.h"
+#include "clang/Basic/CodeGenOptions.h"
+#include "clang/Basic/HeaderInclude.h"
+#include "clang/Basic/LangOptions.h"
+#include "clang/Basic/MakeSupport.h"
+#include "clang/Basic/ObjCRuntime.h"
+#include "clang/Basic/Version.h"
+#include "clang/Config/config.h"
+#include "clang/Driver/Action.h"
+#include "clang/Driver/Distro.h"
+#include "clang/Driver/DriverDiagnostic.h"
+#include "clang/Driver/InputInfo.h"
+#include "clang/Driver/Options.h"
+#include "clang/Driver/SanitizerArgs.h"
+#include "clang/Driver/Types.h"
+#include "clang/Driver/XRayArgs.h"
+#include "llvm/ADT/SmallSet.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Config/llvm-config.h"
+#include "llvm/Option/ArgList.h"
+#include "llvm/Support/ARMTargetParserCommon.h"
+#include "llvm/Support/CodeGen.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/Compression.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/Path.h"
+#include "llvm/Support/Process.h"
+#include "llvm/Support/YAMLParser.h"
+#include <cctype>
+
+using namespace clang::driver;
+using namespace clang::driver::tools;
+using namespace clang;
+using namespace llvm::opt;
+
+static void CheckPreprocessingOptions(const Driver &D, const ArgList &Args) {
+  if (Arg *A = Args.getLastArg(clang::driver::options::OPT_C, options::OPT_CC,
+                               options::OPT_fminimize_whitespace,
+                               options::OPT_fno_minimize_whitespace)) {
+    if (!Args.hasArg(options::OPT_E) && !Args.hasArg(options::OPT__SLASH_P) &&
+        !Args.hasArg(options::OPT__SLASH_EP) && !D.CCCIsCPP()) {
+      D.Diag(clang::diag::err_drv_argument_only_allowed_with)
+          << A->getBaseArg().getAsString(Args)
+          << (D.IsCLMode() ? "/E, /P or /EP" : "-E");
+    }
+  }
+}
+
+static void CheckCodeGenerationOptions(const Driver &D, const ArgList &Args) {
+  // In gcc, only ARM checks this, but it seems reasonable to check universally.
+  if (Args.hasArg(options::OPT_static))
+    if (const Arg *A =
+            Args.getLastArg(options::OPT_dynamic, options::OPT_mdynamic_no_pic))
+      D.Diag(diag::err_drv_argument_not_allowed_with) << A->getAsString(Args)
+                                                      << "-static";
+}
+
+// Add backslashes to escape spaces and other backslashes.
+// This is used for the space-separated argument list specified with
+// the -dwarf-debug-flags option.
+static void EscapeSpacesAndBackslashes(const char *Arg,
+                                       SmallVectorImpl<char> &Res) {
+  for (; *Arg; ++Arg) {
+    switch (*Arg) {
+    default:
+      break;
+    case ' ':
+    case '\\':
+      Res.push_back('\\');
+      break;
+    }
+    Res.push_back(*Arg);
+  }
+}
+
+/// Apply \a Work on the current tool chain \a RegularToolChain and any other
+/// offloading tool chain that is associated with the current action \a JA.
+static void
+forAllAssociatedToolChains(Compilation &C, const JobAction &JA,
+                           const ToolChain &RegularToolChain,
+                           llvm::function_ref<void(const ToolChain &)> Work) {
+  // Apply Work on the current/regular tool chain.
+  Work(RegularToolChain);
+
+  // Apply Work on all the offloading tool chains associated with the current
+  // action.
+  if (JA.isHostOffloading(Action::OFK_Cuda))
+    Work(*C.getSingleOffloadToolChain<Action::OFK_Cuda>());
+  else if (JA.isDeviceOffloading(Action::OFK_Cuda))
+    Work(*C.getSingleOffloadToolChain<Action::OFK_Host>());
+  else if (JA.isHostOffloading(Action::OFK_HIP))
+    Work(*C.getSingleOffloadToolChain<Action::OFK_HIP>());
+  else if (JA.isDeviceOffloading(Action::OFK_HIP))
+    Work(*C.getSingleOffloadToolChain<Action::OFK_Host>());
+
+  if (JA.isHostOffloading(Action::OFK_OpenMP)) {
+    auto TCs = C.getOffloadToolChains<Action::OFK_OpenMP>();
+    for (auto II = TCs.first, IE = TCs.second; II != IE; ++II)
+      Work(*II->second);
+  } else if (JA.isDeviceOffloading(Action::OFK_OpenMP))
+    Work(*C.getSingleOffloadToolChain<Action::OFK_Host>());
+
+  //
+  // TODO: Add support for other offloading programming models here.
+  //
+}
+
+/// This is a helper function for validating the optional refinement step
+/// parameter in reciprocal argument strings. Return false if there is an error
+/// parsing the refinement step. Otherwise, return true and set the Position
+/// of the refinement step in the input string.
+static bool getRefinementStep(StringRef In, const Driver &D,
+                              const Arg &A, size_t &Position) {
+  const char RefinementStepToken = ':';
+  Position = In.find(RefinementStepToken);
+  if (Position != StringRef::npos) {
+    StringRef Option = A.getOption().getName();
+    StringRef RefStep = In.substr(Position + 1);
+    // Allow exactly one numeric character for the additional refinement
+    // step parameter. This is reasonable for all currently-supported
+    // operations and architectures because we would expect that a larger value
+    // of refinement steps would cause the estimate "optimization" to
+    // under-perform the native operation. Also, if the estimate does not
+    // converge quickly, it probably will not ever converge, so further
+    // refinement steps will not produce a better answer.
+    if (RefStep.size() != 1) {
+      D.Diag(diag::err_drv_invalid_value) << Option << RefStep;
+      return false;
+    }
+    char RefStepChar = RefStep[0];
+    if (RefStepChar < '0' || RefStepChar > '9') {
+      D.Diag(diag::err_drv_invalid_value) << Option << RefStep;
+      return false;
+    }
+  }
+  return true;
+}
+
+/// The -mrecip flag requires processing of many optional parameters.
+static void ParseMRecip(const Driver &D, const ArgList &Args,
+                        ArgStringList &OutStrings) {
+  StringRef DisabledPrefixIn = "!";
+  StringRef DisabledPrefixOut = "!";
+  StringRef EnabledPrefixOut = "";
+  StringRef Out = "-mrecip=";
+
+  Arg *A = Args.getLastArg(options::OPT_mrecip, options::OPT_mrecip_EQ);
+  if (!A)
+    return;
+
+  unsigned NumOptions = A->getNumValues();
+  if (NumOptions == 0) {
+    // No option is the same as "all".
+    OutStrings.push_back(Args.MakeArgString(Out + "all"));
+    return;
+  }
+
+  // Pass through "all", "none", or "default" with an optional refinement step.
+  if (NumOptions == 1) {
+    StringRef Val = A->getValue(0);
+    size_t RefStepLoc;
+    if (!getRefinementStep(Val, D, *A, RefStepLoc))
+      return;
+    StringRef ValBase = Val.slice(0, RefStepLoc);
+    if (ValBase == "all" || ValBase == "none" || ValBase == "default") {
+      OutStrings.push_back(Args.MakeArgString(Out + Val));
+      return;
+    }
+  }
+
+  // Each reciprocal type may be enabled or disabled individually.
+  // Check each input value for validity, concatenate them all back together,
+  // and pass through.
+
+  llvm::StringMap<bool> OptionStrings;
+  OptionStrings.insert(std::make_pair("divd", false));
+  OptionStrings.insert(std::make_pair("divf", false));
+  OptionStrings.insert(std::make_pair("divh", false));
+  OptionStrings.insert(std::make_pair("vec-divd", false));
+  OptionStrings.insert(std::make_pair("vec-divf", false));
+  OptionStrings.insert(std::make_pair("vec-divh", false));
+  OptionStrings.insert(std::make_pair("sqrtd", false));
+  OptionStrings.insert(std::make_pair("sqrtf", false));
+  OptionStrings.insert(std::make_pair("sqrth", false));
+  OptionStrings.insert(std::make_pair("vec-sqrtd", false));
+  OptionStrings.insert(std::make_pair("vec-sqrtf", false));
+  OptionStrings.insert(std::make_pair("vec-sqrth", false));
+
+  for (unsigned i = 0; i != NumOptions; ++i) {
+    StringRef Val = A->getValue(i);
+
+    bool IsDisabled = Val.startswith(DisabledPrefixIn);
+    // Ignore the disablement token for string matching.
+    if (IsDisabled)
+      Val = Val.substr(1);
+
+    size_t RefStep;
+    if (!getRefinementStep(Val, D, *A, RefStep))
+      return;
+
+    StringRef ValBase = Val.slice(0, RefStep);
+    llvm::StringMap<bool>::iterator OptionIter = OptionStrings.find(ValBase);
+    if (OptionIter == OptionStrings.end()) {
+      // Try again specifying float suffix.
+      OptionIter = OptionStrings.find(ValBase.str() + 'f');
+      if (OptionIter == OptionStrings.end()) {
+        // The input name did not match any known option string.
+        D.Diag(diag::err_drv_unknown_argument) << Val;
+        return;
+      }
+      // The option was specified without a half or float or double suffix.
+      // Make sure that the double or half entry was not already specified.
+      // The float entry will be checked below.
+      if (OptionStrings[ValBase.str() + 'd'] ||
+          OptionStrings[ValBase.str() + 'h']) {
+        D.Diag(diag::err_drv_invalid_value) << A->getOption().getName() << Val;
+        return;
+      }
+    }
+
+    if (OptionIter->second == true) {
+      // Duplicate option specified.
+      D.Diag(diag::err_drv_invalid_value) << A->getOption().getName() << Val;
+      return;
+    }
+
+    // Mark the matched option as found. Do not allow duplicate specifiers.
+    OptionIter->second = true;
+
+    // If the precision was not specified, also mark the double and half entry
+    // as found.
+    if (ValBase.back() != 'f' && ValBase.back() != 'd' && ValBase.back() != 'h') {
+      OptionStrings[ValBase.str() + 'd'] = true;
+      OptionStrings[ValBase.str() + 'h'] = true;
+    }
+
+    // Build the output string.
+    StringRef Prefix = IsDisabled ? DisabledPrefixOut : EnabledPrefixOut;
+    Out = Args.MakeArgString(Out + Prefix + Val);
+    if (i != NumOptions - 1)
+      Out = Args.MakeArgString(Out + ",");
+  }
+
+  OutStrings.push_back(Args.MakeArgString(Out));
+}
+
+/// The -mprefer-vector-width option accepts either a positive integer
+/// or the string "none".
+static void ParseMPreferVectorWidth(const Driver &D, const ArgList &Args,
+                                    ArgStringList &CmdArgs) {
+  Arg *A = Args.getLastArg(options::OPT_mprefer_vector_width_EQ);
+  if (!A)
+    return;
+
+  StringRef Value = A->getValue();
+  if (Value == "none") {
+    CmdArgs.push_back("-mprefer-vector-width=none");
+  } else {
+    unsigned Width;
+    if (Value.getAsInteger(10, Width)) {
+      D.Diag(diag::err_drv_invalid_value) << A->getOption().getName() << Value;
+      return;
+    }
+    CmdArgs.push_back(Args.MakeArgString("-mprefer-vector-width=" + Value));
+  }
+}
+
+static bool
+shouldUseExceptionTablesForObjCExceptions(const ObjCRuntime &runtime,
+                                          const llvm::Triple &Triple) {
+  // We use the zero-cost exception tables for Objective-C if the non-fragile
+  // ABI is enabled or when compiling for x86_64 and ARM on Snow Leopard and
+  // later.
+  if (runtime.isNonFragile())
+    return true;
+
+  if (!Triple.isMacOSX())
+    return false;
+
+  return (!Triple.isMacOSXVersionLT(10, 5) &&
+          (Triple.getArch() == llvm::Triple::x86_64 ||
+           Triple.getArch() == llvm::Triple::arm));
+}
+
+/// Adds exception related arguments to the driver command arguments. There's a
+/// main flag, -fexceptions and also language specific flags to enable/disable
+/// C++ and Objective-C exceptions. This makes it possible to for example
+/// disable C++ exceptions but enable Objective-C exceptions.
+static bool addExceptionArgs(const ArgList &Args, types::ID InputType,
+                             const ToolChain &TC, bool KernelOrKext,
+                             const ObjCRuntime &objcRuntime,
+                             ArgStringList &CmdArgs) {
+  const llvm::Triple &Triple = TC.getTriple();
+
+  if (KernelOrKext) {
+    // -mkernel and -fapple-kext imply no exceptions, so claim exception related
+    // arguments now to avoid warnings about unused arguments.
+    Args.ClaimAllArgs(options::OPT_fexceptions);
+    Args.ClaimAllArgs(options::OPT_fno_exceptions);
+    Args.ClaimAllArgs(options::OPT_fobjc_exceptions);
+    Args.ClaimAllArgs(options::OPT_fno_objc_exceptions);
+    Args.ClaimAllArgs(options::OPT_fcxx_exceptions);
+    Args.ClaimAllArgs(options::OPT_fno_cxx_exceptions);
+    Args.ClaimAllArgs(options::OPT_fasync_exceptions);
+    Args.ClaimAllArgs(options::OPT_fno_async_exceptions);
+    return false;
+  }
+
+  // See if the user explicitly enabled exceptions.
+  bool EH = Args.hasFlag(options::OPT_fexceptions, options::OPT_fno_exceptions,
+                         false);
+
+  bool EHa = Args.hasFlag(options::OPT_fasync_exceptions,
+                          options::OPT_fno_async_exceptions, false);
+  if (EHa) {
+    CmdArgs.push_back("-fasync-exceptions");
+    EH = true;
+  }
+
+  // Obj-C exceptions are enabled by default, regardless of -fexceptions. This
+  // is not necessarily sensible, but follows GCC.
+  if (types::isObjC(InputType) &&
+      Args.hasFlag(options::OPT_fobjc_exceptions,
+                   options::OPT_fno_objc_exceptions, true)) {
+    CmdArgs.push_back("-fobjc-exceptions");
+
+    EH |= shouldUseExceptionTablesForObjCExceptions(objcRuntime, Triple);
+  }
+
+  if (types::isCXX(InputType)) {
+    // Disable C++ EH by default on XCore and PS4/PS5.
+    bool CXXExceptionsEnabled = Triple.getArch() != llvm::Triple::xcore &&
+                                !Triple.isPS() && !Triple.isDriverKit();
+    Arg *ExceptionArg = Args.getLastArg(
+        options::OPT_fcxx_exceptions, options::OPT_fno_cxx_exceptions,
+        options::OPT_fexceptions, options::OPT_fno_exceptions);
+    if (ExceptionArg)
+      CXXExceptionsEnabled =
+          ExceptionArg->getOption().matches(options::OPT_fcxx_exceptions) ||
+          ExceptionArg->getOption().matches(options::OPT_fexceptions);
+
+    if (CXXExceptionsEnabled) {
+      CmdArgs.push_back("-fcxx-exceptions");
+
+      EH = true;
+    }
+  }
+
+  // OPT_fignore_exceptions means exception could still be thrown,
+  // but no clean up or catch would happen in current module.
+  // So we do not set EH to false.
+  Args.AddLastArg(CmdArgs, options::OPT_fignore_exceptions);
+
+  if (EH)
+    CmdArgs.push_back("-fexceptions");
+  return EH;
+}
+
+static bool ShouldEnableAutolink(const ArgList &Args, const ToolChain &TC,
+                                 const JobAction &JA) {
+  bool Default = true;
+  if (TC.getTriple().isOSDarwin()) {
+    // The native darwin assembler doesn't support the linker_option directives,
+    // so we disable them if we think the .s file will be passed to it.
+    Default = TC.useIntegratedAs();
+  }
+  // The linker_option directives are intended for host compilation.
+  if (JA.isDeviceOffloading(Action::OFK_Cuda) ||
+      JA.isDeviceOffloading(Action::OFK_HIP))
+    Default = false;
+  return Args.hasFlag(options::OPT_fautolink, options::OPT_fno_autolink,
+                      Default);
+}
+
+// Convert an arg of the form "-gN" or "-ggdbN" or one of their aliases
+// to the corresponding DebugInfoKind.
+static codegenoptions::DebugInfoKind DebugLevelToInfoKind(const Arg &A) {
+  assert(A.getOption().matches(options::OPT_gN_Group) &&
+         "Not a -g option that specifies a debug-info level");
+  if (A.getOption().matches(options::OPT_g0) ||
+      A.getOption().matches(options::OPT_ggdb0))
+    return codegenoptions::NoDebugInfo;
+  if (A.getOption().matches(options::OPT_gline_tables_only) ||
+      A.getOption().matches(options::OPT_ggdb1))
+    return codegenoptions::DebugLineTablesOnly;
+  if (A.getOption().matches(options::OPT_gline_directives_only))
+    return codegenoptions::DebugDirectivesOnly;
+  return codegenoptions::DebugInfoConstructor;
+}
+
+static bool mustUseNonLeafFramePointerForTarget(const llvm::Triple &Triple) {
+  switch (Triple.getArch()){
+  default:
+    return false;
+  case llvm::Triple::arm:
+  case llvm::Triple::thumb:
+    // ARM Darwin targets require a frame pointer to be always present to aid
+    // offline debugging via backtraces.
+    return Triple.isOSDarwin();
+  }
+}
+
+static bool useFramePointerForTargetByDefault(const ArgList &Args,
+                                              const llvm::Triple &Triple) {
+  if (Args.hasArg(options::OPT_pg) && !Args.hasArg(options::OPT_mfentry))
+    return true;
+
+  switch (Triple.getArch()) {
+  case llvm::Triple::xcore:
+  case llvm::Triple::wasm32:
+  case llvm::Triple::wasm64:
+  case llvm::Triple::msp430:
+    // XCore never wants frame pointers, regardless of OS.
+    // WebAssembly never wants frame pointers.
+    return false;
+  case llvm::Triple::ppc:
+  case llvm::Triple::ppcle:
+  case llvm::Triple::ppc64:
+  case llvm::Triple::ppc64le:
+  case llvm::Triple::riscv32:
+  case llvm::Triple::riscv64:
+  case llvm::Triple::sparc:
+  case llvm::Triple::sparcel:
+  case llvm::Triple::sparcv9:
+  case llvm::Triple::amdgcn:
+  case llvm::Triple::r600:
+  case llvm::Triple::csky:
+  case llvm::Triple::loongarch32:
+  case llvm::Triple::loongarch64:
+    return !areOptimizationsEnabled(Args);
+  default:
+    break;
+  }
+
+  if (Triple.isOSFuchsia() || Triple.isOSNetBSD()) {
+    return !areOptimizationsEnabled(Args);
+  }
+
+  if (Triple.isOSLinux() || Triple.getOS() == llvm::Triple::CloudABI ||
+      Triple.isOSHurd()) {
+    switch (Triple.getArch()) {
+    // Don't use a frame pointer on linux if optimizing for certain targets.
+    case llvm::Triple::arm:
+    case llvm::Triple::armeb:
+    case llvm::Triple::thumb:
+    case llvm::Triple::thumbeb:
+      if (Triple.isAndroid())
+        return true;
+      [[fallthrough]];
+    case llvm::Triple::mips64:
+    case llvm::Triple::mips64el:
+    case llvm::Triple::mips:
+    case llvm::Triple::mipsel:
+    case llvm::Triple::systemz:
+    case llvm::Triple::x86:
+    case llvm::Triple::x86_64:
+      return !areOptimizationsEnabled(Args);
+    default:
+      return true;
+    }
+  }
+
+  if (Triple.isOSWindows()) {
+    switch (Triple.getArch()) {
+    case llvm::Triple::x86:
+      return !areOptimizationsEnabled(Args);
+    case llvm::Triple::x86_64:
+      return Triple.isOSBinFormatMachO();
+    case llvm::Triple::arm:
+    case llvm::Triple::thumb:
+      // Windows on ARM builds with FPO disabled to aid fast stack walking
+      return true;
+    default:
+      // All other supported Windows ISAs use xdata unwind information, so frame
+      // pointers are not generally useful.
+      return false;
+    }
+  }
+
+  return true;
+}
+
+static CodeGenOptions::FramePointerKind
+getFramePointerKind(const ArgList &Args, const llvm::Triple &Triple) {
+  // We have 4 states:
+  //
+  //  00) leaf retained, non-leaf retained
+  //  01) leaf retained, non-leaf omitted (this is invalid)
+  //  10) leaf omitted, non-leaf retained
+  //      (what -momit-leaf-frame-pointer was designed for)
+  //  11) leaf omitted, non-leaf omitted
+  //
+  //  "omit" options taking precedence over "no-omit" options is the only way
+  //  to make 3 valid states representable
+  Arg *A = Args.getLastArg(options::OPT_fomit_frame_pointer,
+                           options::OPT_fno_omit_frame_pointer);
+  bool OmitFP = A && A->getOption().matches(options::OPT_fomit_frame_pointer);
+  bool NoOmitFP =
+      A && A->getOption().matches(options::OPT_fno_omit_frame_pointer);
+  bool OmitLeafFP =
+      Args.hasFlag(options::OPT_momit_leaf_frame_pointer,
+                   options::OPT_mno_omit_leaf_frame_pointer,
+                   Triple.isAArch64() || Triple.isPS() || Triple.isVE());
+  if (NoOmitFP || mustUseNonLeafFramePointerForTarget(Triple) ||
+      (!OmitFP && useFramePointerForTargetByDefault(Args, Triple))) {
+    if (OmitLeafFP)
+      return CodeGenOptions::FramePointerKind::NonLeaf;
+    return CodeGenOptions::FramePointerKind::All;
+  }
+  return CodeGenOptions::FramePointerKind::None;
+}
+
+/// Add a CC1 option to specify the debug compilation directory.
+static const char *addDebugCompDirArg(const ArgList &Args,
+                                      ArgStringList &CmdArgs,
+                                      const llvm::vfs::FileSystem &VFS) {
+  if (Arg *A = Args.getLastArg(options::OPT_ffile_compilation_dir_EQ,
+                               options::OPT_fdebug_compilation_dir_EQ)) {
+    if (A->getOption().matches(options::OPT_ffile_compilation_dir_EQ))
+      CmdArgs.push_back(Args.MakeArgString(Twine("-fdebug-compilation-dir=") +
+                                           A->getValue()));
+    else
+      A->render(Args, CmdArgs);
+  } else if (llvm::ErrorOr<std::string> CWD =
+                 VFS.getCurrentWorkingDirectory()) {
+    CmdArgs.push_back(Args.MakeArgString("-fdebug-compilation-dir=" + *CWD));
+  }
+  StringRef Path(CmdArgs.back());
+  return Path.substr(Path.find('=') + 1).data();
+}
+
+static void addDebugObjectName(const ArgList &Args, ArgStringList &CmdArgs,
+                               const char *DebugCompilationDir,
+                               const char *OutputFileName) {
+  // No need to generate a value for -object-file-name if it was provided.
+  for (auto *Arg : Args.filtered(options::OPT_Xclang))
+    if (StringRef(Arg->getValue()).startswith("-object-file-name"))
+      return;
+
+  if (Args.hasArg(options::OPT_object_file_name_EQ))
+    return;
+
+  SmallString<128> ObjFileNameForDebug(OutputFileName);
+  if (ObjFileNameForDebug != "-" &&
+      !llvm::sys::path::is_absolute(ObjFileNameForDebug) &&
+      (!DebugCompilationDir ||
+       llvm::sys::path::is_absolute(DebugCompilationDir))) {
+    // Make the path absolute in the debug infos like MSVC does.
+    llvm::sys::fs::make_absolute(ObjFileNameForDebug);
+  }
+  CmdArgs.push_back(
+      Args.MakeArgString(Twine("-object-file-name=") + ObjFileNameForDebug));
+}
+
+/// Add a CC1 and CC1AS option to specify the debug file path prefix map.
+static void addDebugPrefixMapArg(const Driver &D, const ToolChain &TC,
+                                 const ArgList &Args, ArgStringList &CmdArgs) {
+  auto AddOneArg = [&](StringRef Map, StringRef Name) {
+    if (!Map.contains('='))
+      D.Diag(diag::err_drv_invalid_argument_to_option) << Map << Name;
+    else
+      CmdArgs.push_back(Args.MakeArgString("-fdebug-prefix-map=" + Map));
+  };
+
+  for (const Arg *A : Args.filtered(options::OPT_ffile_prefix_map_EQ,
+                                    options::OPT_fdebug_prefix_map_EQ)) {
+    AddOneArg(A->getValue(), A->getOption().getName());
+    A->claim();
+  }
+  std::string GlobalRemapEntry = TC.GetGlobalDebugPathRemapping();
+  if (GlobalRemapEntry.empty())
+    return;
+  AddOneArg(GlobalRemapEntry, "environment");
+}
+
+/// Add a CC1 and CC1AS option to specify the macro file path prefix map.
+static void addMacroPrefixMapArg(const Driver &D, const ArgList &Args,
+                                 ArgStringList &CmdArgs) {
+  for (const Arg *A : Args.filtered(options::OPT_ffile_prefix_map_EQ,
+                                    options::OPT_fmacro_prefix_map_EQ)) {
+    StringRef Map = A->getValue();
+    if (!Map.contains('='))
+      D.Diag(diag::err_drv_invalid_argument_to_option)
+          << Map << A->getOption().getName();
+    else
+      CmdArgs.push_back(Args.MakeArgString("-fmacro-prefix-map=" + Map));
+    A->claim();
+  }
+}
+
+/// Add a CC1 and CC1AS option to specify the coverage file path prefix map.
+static void addCoveragePrefixMapArg(const Driver &D, const ArgList &Args,
+                                   ArgStringList &CmdArgs) {
+  for (const Arg *A : Args.filtered(options::OPT_ffile_prefix_map_EQ,
+                                    options::OPT_fcoverage_prefix_map_EQ)) {
+    StringRef Map = A->getValue();
+    if (!Map.contains('='))
+      D.Diag(diag::err_drv_invalid_argument_to_option)
+          << Map << A->getOption().getName();
+    else
+      CmdArgs.push_back(Args.MakeArgString("-fcoverage-prefix-map=" + Map));
+    A->claim();
+  }
+}
+
+/// Vectorize at all optimization levels greater than 1 except for -Oz.
+/// For -Oz the loop vectorizer is disabled, while the slp vectorizer is
+/// enabled.
+static bool shouldEnableVectorizerAtOLevel(const ArgList &Args, bool isSlpVec) {
+  if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
+    if (A->getOption().matches(options::OPT_O4) ||
+        A->getOption().matches(options::OPT_Ofast))
+      return true;
+
+    if (A->getOption().matches(options::OPT_O0))
+      return false;
+
+    assert(A->getOption().matches(options::OPT_O) && "Must have a -O flag");
+
+    // Vectorize -Os.
+    StringRef S(A->getValue());
+    if (S == "s")
+      return true;
+
+    // Don't vectorize -Oz, unless it's the slp vectorizer.
+    if (S == "z")
+      return isSlpVec;
+
+    unsigned OptLevel = 0;
+    if (S.getAsInteger(10, OptLevel))
+      return false;
+
+    return OptLevel > 1;
+  }
+
+  return false;
+}
+
+/// Add -x lang to \p CmdArgs for \p Input.
+static void addDashXForInput(const ArgList &Args, const InputInfo &Input,
+                             ArgStringList &CmdArgs) {
+  // When using -verify-pch, we don't want to provide the type
+  // 'precompiled-header' if it was inferred from the file extension
+  if (Args.hasArg(options::OPT_verify_pch) && Input.getType() == types::TY_PCH)
+    return;
+
+  CmdArgs.push_back("-x");
+  if (Args.hasArg(options::OPT_rewrite_objc))
+    CmdArgs.push_back(types::getTypeName(types::TY_PP_ObjCXX));
+  else {
+    // Map the driver type to the frontend type. This is mostly an identity
+    // mapping, except that the distinction between module interface units
+    // and other source files does not exist at the frontend layer.
+    const char *ClangType;
+    switch (Input.getType()) {
+    case types::TY_CXXModule:
+      ClangType = "c++";
+      break;
+    case types::TY_PP_CXXModule:
+      ClangType = "c++-cpp-output";
+      break;
+    default:
+      ClangType = types::getTypeName(Input.getType());
+      break;
+    }
+    CmdArgs.push_back(ClangType);
+  }
+}
+
+static void addPGOAndCoverageFlags(const ToolChain &TC, Compilation &C,
+                                   const Driver &D, const InputInfo &Output,
+                                   const ArgList &Args, SanitizerArgs &SanArgs,
+                                   ArgStringList &CmdArgs) {
+
+  auto *PGOGenerateArg = Args.getLastArg(options::OPT_fprofile_generate,
+                                         options::OPT_fprofile_generate_EQ,
+                                         options::OPT_fno_profile_generate);
+  if (PGOGenerateArg &&
+      PGOGenerateArg->getOption().matches(options::OPT_fno_profile_generate))
+    PGOGenerateArg = nullptr;
+
+  auto *CSPGOGenerateArg = Args.getLastArg(options::OPT_fcs_profile_generate,
+                                           options::OPT_fcs_profile_generate_EQ,
+                                           options::OPT_fno_profile_generate);
+  if (CSPGOGenerateArg &&
+      CSPGOGenerateArg->getOption().matches(options::OPT_fno_profile_generate))
+    CSPGOGenerateArg = nullptr;
+
+  auto *ProfileGenerateArg = Args.getLastArg(
+      options::OPT_fprofile_instr_generate,
+      options::OPT_fprofile_instr_generate_EQ,
+      options::OPT_fno_profile_instr_generate);
+  if (ProfileGenerateArg &&
+      ProfileGenerateArg->getOption().matches(
+          options::OPT_fno_profile_instr_generate))
+    ProfileGenerateArg = nullptr;
+
+  if (PGOGenerateArg && ProfileGenerateArg)
+    D.Diag(diag::err_drv_argument_not_allowed_with)
+        << PGOGenerateArg->getSpelling() << ProfileGenerateArg->getSpelling();
+
+  auto *ProfileUseArg = getLastProfileUseArg(Args);
+
+  if (PGOGenerateArg && ProfileUseArg)
+    D.Diag(diag::err_drv_argument_not_allowed_with)
+        << ProfileUseArg->getSpelling() << PGOGenerateArg->getSpelling();
+
+  if (ProfileGenerateArg && ProfileUseArg)
+    D.Diag(diag::err_drv_argument_not_allowed_with)
+        << ProfileGenerateArg->getSpelling() << ProfileUseArg->getSpelling();
+
+  if (CSPGOGenerateArg && PGOGenerateArg) {
+    D.Diag(diag::err_drv_argument_not_allowed_with)
+        << CSPGOGenerateArg->getSpelling() << PGOGenerateArg->getSpelling();
+    PGOGenerateArg = nullptr;
+  }
+
+  if (TC.getTriple().isOSAIX()) {
+    if (ProfileGenerateArg)
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << ProfileGenerateArg->getSpelling() << TC.getTriple().str();
+    if (Arg *ProfileSampleUseArg = getLastProfileSampleUseArg(Args))
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << ProfileSampleUseArg->getSpelling() << TC.getTriple().str();
+  }
+
+  if (ProfileGenerateArg) {
+    if (ProfileGenerateArg->getOption().matches(
+            options::OPT_fprofile_instr_generate_EQ))
+      CmdArgs.push_back(Args.MakeArgString(Twine("-fprofile-instrument-path=") +
+                                           ProfileGenerateArg->getValue()));
+    // The default is to use Clang Instrumentation.
+    CmdArgs.push_back("-fprofile-instrument=clang");
+    if (TC.getTriple().isWindowsMSVCEnvironment()) {
+      // Add dependent lib for clang_rt.profile
+      CmdArgs.push_back(Args.MakeArgString(
+          "--dependent-lib=" + TC.getCompilerRTBasename(Args, "profile")));
+    }
+  }
+
+  Arg *PGOGenArg = nullptr;
+  if (PGOGenerateArg) {
+    assert(!CSPGOGenerateArg);
+    PGOGenArg = PGOGenerateArg;
+    CmdArgs.push_back("-fprofile-instrument=llvm");
+  }
+  if (CSPGOGenerateArg) {
+    assert(!PGOGenerateArg);
+    PGOGenArg = CSPGOGenerateArg;
+    CmdArgs.push_back("-fprofile-instrument=csllvm");
+  }
+  if (PGOGenArg) {
+    if (TC.getTriple().isWindowsMSVCEnvironment()) {
+      // Add dependent lib for clang_rt.profile
+      CmdArgs.push_back(Args.MakeArgString(
+          "--dependent-lib=" + TC.getCompilerRTBasename(Args, "profile")));
+    }
+    if (PGOGenArg->getOption().matches(
+            PGOGenerateArg ? options::OPT_fprofile_generate_EQ
+                           : options::OPT_fcs_profile_generate_EQ)) {
+      SmallString<128> Path(PGOGenArg->getValue());
+      llvm::sys::path::append(Path, "default_%m.profraw");
+      CmdArgs.push_back(
+          Args.MakeArgString(Twine("-fprofile-instrument-path=") + Path));
+    }
+  }
+
+  if (ProfileUseArg) {
+    if (ProfileUseArg->getOption().matches(options::OPT_fprofile_instr_use_EQ))
+      CmdArgs.push_back(Args.MakeArgString(
+          Twine("-fprofile-instrument-use-path=") + ProfileUseArg->getValue()));
+    else if ((ProfileUseArg->getOption().matches(
+                  options::OPT_fprofile_use_EQ) ||
+              ProfileUseArg->getOption().matches(
+                  options::OPT_fprofile_instr_use))) {
+      SmallString<128> Path(
+          ProfileUseArg->getNumValues() == 0 ? "" : ProfileUseArg->getValue());
+      if (Path.empty() || llvm::sys::fs::is_directory(Path))
+        llvm::sys::path::append(Path, "default.profdata");
+      CmdArgs.push_back(
+          Args.MakeArgString(Twine("-fprofile-instrument-use-path=") + Path));
+    }
+  }
+
+  bool EmitCovNotes = Args.hasFlag(options::OPT_ftest_coverage,
+                                   options::OPT_fno_test_coverage, false) ||
+                      Args.hasArg(options::OPT_coverage);
+  bool EmitCovData = TC.needsGCovInstrumentation(Args);
+  if (EmitCovNotes)
+    CmdArgs.push_back("-ftest-coverage");
+  if (EmitCovData)
+    CmdArgs.push_back("-fprofile-arcs");
+
+  if (Args.hasFlag(options::OPT_fcoverage_mapping,
+                   options::OPT_fno_coverage_mapping, false)) {
+    if (!ProfileGenerateArg)
+      D.Diag(clang::diag::err_drv_argument_only_allowed_with)
+          << "-fcoverage-mapping"
+          << "-fprofile-instr-generate";
+
+    CmdArgs.push_back("-fcoverage-mapping");
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_ffile_compilation_dir_EQ,
+                               options::OPT_fcoverage_compilation_dir_EQ)) {
+    if (A->getOption().matches(options::OPT_ffile_compilation_dir_EQ))
+      CmdArgs.push_back(Args.MakeArgString(
+          Twine("-fcoverage-compilation-dir=") + A->getValue()));
+    else
+      A->render(Args, CmdArgs);
+  } else if (llvm::ErrorOr<std::string> CWD =
+                 D.getVFS().getCurrentWorkingDirectory()) {
+    CmdArgs.push_back(Args.MakeArgString("-fcoverage-compilation-dir=" + *CWD));
+  }
+
+  if (Args.hasArg(options::OPT_fprofile_exclude_files_EQ)) {
+    auto *Arg = Args.getLastArg(options::OPT_fprofile_exclude_files_EQ);
+    if (!Args.hasArg(options::OPT_coverage))
+      D.Diag(clang::diag::err_drv_argument_only_allowed_with)
+          << "-fprofile-exclude-files="
+          << "--coverage";
+
+    StringRef v = Arg->getValue();
+    CmdArgs.push_back(
+        Args.MakeArgString(Twine("-fprofile-exclude-files=" + v)));
+  }
+
+  if (Args.hasArg(options::OPT_fprofile_filter_files_EQ)) {
+    auto *Arg = Args.getLastArg(options::OPT_fprofile_filter_files_EQ);
+    if (!Args.hasArg(options::OPT_coverage))
+      D.Diag(clang::diag::err_drv_argument_only_allowed_with)
+          << "-fprofile-filter-files="
+          << "--coverage";
+
+    StringRef v = Arg->getValue();
+    CmdArgs.push_back(Args.MakeArgString(Twine("-fprofile-filter-files=" + v)));
+  }
+
+  if (const auto *A = Args.getLastArg(options::OPT_fprofile_update_EQ)) {
+    StringRef Val = A->getValue();
+    if (Val == "atomic" || Val == "prefer-atomic")
+      CmdArgs.push_back("-fprofile-update=atomic");
+    else if (Val != "single")
+      D.Diag(diag::err_drv_unsupported_option_argument)
+          << A->getSpelling() << Val;
+  } else if (SanArgs.needsTsanRt()) {
+    CmdArgs.push_back("-fprofile-update=atomic");
+  }
+
+  int FunctionGroups = 1;
+  int SelectedFunctionGroup = 0;
+  if (const auto *A = Args.getLastArg(options::OPT_fprofile_function_groups)) {
+    StringRef Val = A->getValue();
+    if (Val.getAsInteger(0, FunctionGroups) || FunctionGroups < 1)
+      D.Diag(diag::err_drv_invalid_int_value) << A->getAsString(Args) << Val;
+  }
+  if (const auto *A =
+          Args.getLastArg(options::OPT_fprofile_selected_function_group)) {
+    StringRef Val = A->getValue();
+    if (Val.getAsInteger(0, SelectedFunctionGroup) ||
+        SelectedFunctionGroup < 0 || SelectedFunctionGroup >= FunctionGroups)
+      D.Diag(diag::err_drv_invalid_int_value) << A->getAsString(Args) << Val;
+  }
+  if (FunctionGroups != 1)
+    CmdArgs.push_back(Args.MakeArgString("-fprofile-function-groups=" +
+                                         Twine(FunctionGroups)));
+  if (SelectedFunctionGroup != 0)
+    CmdArgs.push_back(Args.MakeArgString("-fprofile-selected-function-group=" +
+                                         Twine(SelectedFunctionGroup)));
+
+  // Leave -fprofile-dir= an unused argument unless .gcda emission is
+  // enabled. To be polite, with '-fprofile-arcs -fno-profile-arcs' consider
+  // the flag used. There is no -fno-profile-dir, so the user has no
+  // targeted way to suppress the warning.
+  Arg *FProfileDir = nullptr;
+  if (Args.hasArg(options::OPT_fprofile_arcs) ||
+      Args.hasArg(options::OPT_coverage))
+    FProfileDir = Args.getLastArg(options::OPT_fprofile_dir);
+
+  // Put the .gcno and .gcda files (if needed) next to the object file or
+  // bitcode file in the case of LTO.
+  // FIXME: There should be a simpler way to find the object file for this
+  // input, and this code probably does the wrong thing for commands that
+  // compile and link all at once.
+  if ((Args.hasArg(options::OPT_c) || Args.hasArg(options::OPT_S)) &&
+      (EmitCovNotes || EmitCovData) && Output.isFilename()) {
+    SmallString<128> OutputFilename;
+    if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT__SLASH_Fo))
+      OutputFilename = FinalOutput->getValue();
+    else if (Arg *FinalOutput = C.getArgs().getLastArg(options::OPT_o))
+      OutputFilename = FinalOutput->getValue();
+    else
+      OutputFilename = llvm::sys::path::filename(Output.getBaseInput());
+    SmallString<128> CoverageFilename = OutputFilename;
+    if (llvm::sys::path::is_relative(CoverageFilename))
+      (void)D.getVFS().makeAbsolute(CoverageFilename);
+    llvm::sys::path::replace_extension(CoverageFilename, "gcno");
+
+    CmdArgs.push_back("-coverage-notes-file");
+    CmdArgs.push_back(Args.MakeArgString(CoverageFilename));
+
+    if (EmitCovData) {
+      if (FProfileDir) {
+        CoverageFilename = FProfileDir->getValue();
+        llvm::sys::path::append(CoverageFilename, OutputFilename);
+      }
+      llvm::sys::path::replace_extension(CoverageFilename, "gcda");
+      CmdArgs.push_back("-coverage-data-file");
+      CmdArgs.push_back(Args.MakeArgString(CoverageFilename));
+    }
+  }
+}
+
+/// Check whether the given input tree contains any compilation actions.
+static bool ContainsCompileAction(const Action *A) {
+  if (isa<CompileJobAction>(A) || isa<BackendJobAction>(A))
+    return true;
+
+  return llvm::any_of(A->inputs(), ContainsCompileAction);
+}
+
+/// Check if -relax-all should be passed to the internal assembler.
+/// This is done by default when compiling non-assembler source with -O0.
+static bool UseRelaxAll(Compilation &C, const ArgList &Args) {
+  bool RelaxDefault = true;
+
+  if (Arg *A = Args.getLastArg(options::OPT_O_Group))
+    RelaxDefault = A->getOption().matches(options::OPT_O0);
+
+  if (RelaxDefault) {
+    RelaxDefault = false;
+    for (const auto &Act : C.getActions()) {
+      if (ContainsCompileAction(Act)) {
+        RelaxDefault = true;
+        break;
+      }
+    }
+  }
+
+  return Args.hasFlag(options::OPT_mrelax_all, options::OPT_mno_relax_all,
+                      RelaxDefault);
+}
+
+static void RenderDebugEnablingArgs(const ArgList &Args, ArgStringList &CmdArgs,
+                                    codegenoptions::DebugInfoKind DebugInfoKind,
+                                    unsigned DwarfVersion,
+                                    llvm::DebuggerKind DebuggerTuning) {
+  switch (DebugInfoKind) {
+  case codegenoptions::DebugDirectivesOnly:
+    CmdArgs.push_back("-debug-info-kind=line-directives-only");
+    break;
+  case codegenoptions::DebugLineTablesOnly:
+    CmdArgs.push_back("-debug-info-kind=line-tables-only");
+    break;
+  case codegenoptions::DebugInfoConstructor:
+    CmdArgs.push_back("-debug-info-kind=constructor");
+    break;
+  case codegenoptions::LimitedDebugInfo:
+    CmdArgs.push_back("-debug-info-kind=limited");
+    break;
+  case codegenoptions::FullDebugInfo:
+    CmdArgs.push_back("-debug-info-kind=standalone");
+    break;
+  case codegenoptions::UnusedTypeInfo:
+    CmdArgs.push_back("-debug-info-kind=unused-types");
+    break;
+  default:
+    break;
+  }
+  if (DwarfVersion > 0)
+    CmdArgs.push_back(
+        Args.MakeArgString("-dwarf-version=" + Twine(DwarfVersion)));
+  switch (DebuggerTuning) {
+  case llvm::DebuggerKind::GDB:
+    CmdArgs.push_back("-debugger-tuning=gdb");
+    break;
+  case llvm::DebuggerKind::LLDB:
+    CmdArgs.push_back("-debugger-tuning=lldb");
+    break;
+  case llvm::DebuggerKind::SCE:
+    CmdArgs.push_back("-debugger-tuning=sce");
+    break;
+  case llvm::DebuggerKind::DBX:
+    CmdArgs.push_back("-debugger-tuning=dbx");
+    break;
+  default:
+    break;
+  }
+}
+
+static bool checkDebugInfoOption(const Arg *A, const ArgList &Args,
+                                 const Driver &D, const ToolChain &TC) {
+  assert(A && "Expected non-nullptr argument.");
+  if (TC.supportsDebugInfoOption(A))
+    return true;
+  D.Diag(diag::warn_drv_unsupported_debug_info_opt_for_target)
+      << A->getAsString(Args) << TC.getTripleString();
+  return false;
+}
+
+static void RenderDebugInfoCompressionArgs(const ArgList &Args,
+                                           ArgStringList &CmdArgs,
+                                           const Driver &D,
+                                           const ToolChain &TC) {
+  const Arg *A = Args.getLastArg(options::OPT_gz_EQ);
+  if (!A)
+    return;
+  if (checkDebugInfoOption(A, Args, D, TC)) {
+    StringRef Value = A->getValue();
+    if (Value == "none") {
+      CmdArgs.push_back("--compress-debug-sections=none");
+    } else if (Value == "zlib") {
+      if (llvm::compression::zlib::isAvailable()) {
+        CmdArgs.push_back(
+            Args.MakeArgString("--compress-debug-sections=" + Twine(Value)));
+      } else {
+        D.Diag(diag::warn_debug_compression_unavailable) << "zlib";
+      }
+    } else if (Value == "zstd") {
+      if (llvm::compression::zstd::isAvailable()) {
+        CmdArgs.push_back(
+            Args.MakeArgString("--compress-debug-sections=" + Twine(Value)));
+      } else {
+        D.Diag(diag::warn_debug_compression_unavailable) << "zstd";
+      }
+    } else {
+      D.Diag(diag::err_drv_unsupported_option_argument)
+          << A->getSpelling() << Value;
+    }
+  }
+}
+
+static void handleAMDGPUCodeObjectVersionOptions(const Driver &D,
+                                                 const ArgList &Args,
+                                                 ArgStringList &CmdArgs,
+                                                 bool IsCC1As = false) {
+  // If no version was requested by the user, use the default value from the
+  // back end. This is consistent with the value returned from
+  // getAMDGPUCodeObjectVersion. This lets clang emit IR for amdgpu without
+  // requiring the corresponding llvm to have the AMDGPU target enabled,
+  // provided the user (e.g. front end tests) can use the default.
+  if (haveAMDGPUCodeObjectVersionArgument(D, Args)) {
+    unsigned CodeObjVer = getAMDGPUCodeObjectVersion(D, Args);
+    CmdArgs.insert(CmdArgs.begin() + 1,
+                   Args.MakeArgString(Twine("--amdhsa-code-object-version=") +
+                                      Twine(CodeObjVer)));
+    CmdArgs.insert(CmdArgs.begin() + 1, "-mllvm");
+    // -cc1as does not accept -mcode-object-version option.
+    if (!IsCC1As)
+      CmdArgs.insert(CmdArgs.begin() + 1,
+                     Args.MakeArgString(Twine("-mcode-object-version=") +
+                                        Twine(CodeObjVer)));
+  }
+}
+
+void Clang::AddPreprocessingOptions(Compilation &C, const JobAction &JA,
+                                    const Driver &D, const ArgList &Args,
+                                    ArgStringList &CmdArgs,
+                                    const InputInfo &Output,
+                                    const InputInfoList &Inputs) const {
+  const bool IsIAMCU = getToolChain().getTriple().isOSIAMCU();
+
+  CheckPreprocessingOptions(D, Args);
+
+  Args.AddLastArg(CmdArgs, options::OPT_C);
+  Args.AddLastArg(CmdArgs, options::OPT_CC);
+
+  // Handle dependency file generation.
+  Arg *ArgM = Args.getLastArg(options::OPT_MM);
+  if (!ArgM)
+    ArgM = Args.getLastArg(options::OPT_M);
+  Arg *ArgMD = Args.getLastArg(options::OPT_MMD);
+  if (!ArgMD)
+    ArgMD = Args.getLastArg(options::OPT_MD);
+
+  // -M and -MM imply -w.
+  if (ArgM)
+    CmdArgs.push_back("-w");
+  else
+    ArgM = ArgMD;
+
+  if (ArgM) {
+    // Determine the output location.
+    const char *DepFile;
+    if (Arg *MF = Args.getLastArg(options::OPT_MF)) {
+      DepFile = MF->getValue();
+      C.addFailureResultFile(DepFile, &JA);
+    } else if (Output.getType() == types::TY_Dependencies) {
+      DepFile = Output.getFilename();
+    } else if (!ArgMD) {
+      DepFile = "-";
+    } else {
+      DepFile = getDependencyFileName(Args, Inputs);
+      C.addFailureResultFile(DepFile, &JA);
+    }
+    CmdArgs.push_back("-dependency-file");
+    CmdArgs.push_back(DepFile);
+
+    bool HasTarget = false;
+    for (const Arg *A : Args.filtered(options::OPT_MT, options::OPT_MQ)) {
+      HasTarget = true;
+      A->claim();
+      if (A->getOption().matches(options::OPT_MT)) {
+        A->render(Args, CmdArgs);
+      } else {
+        CmdArgs.push_back("-MT");
+        SmallString<128> Quoted;
+        quoteMakeTarget(A->getValue(), Quoted);
+        CmdArgs.push_back(Args.MakeArgString(Quoted));
+      }
+    }
+
+    // Add a default target if one wasn't specified.
+    if (!HasTarget) {
+      const char *DepTarget;
+
+      // If user provided -o, that is the dependency target, except
+      // when we are only generating a dependency file.
+      Arg *OutputOpt = Args.getLastArg(options::OPT_o);
+      if (OutputOpt && Output.getType() != types::TY_Dependencies) {
+        DepTarget = OutputOpt->getValue();
+      } else {
+        // Otherwise derive from the base input.
+        //
+        // FIXME: This should use the computed output file location.
+        SmallString<128> P(Inputs[0].getBaseInput());
+        llvm::sys::path::replace_extension(P, "o");
+        DepTarget = Args.MakeArgString(llvm::sys::path::filename(P));
+      }
+
+      CmdArgs.push_back("-MT");
+      SmallString<128> Quoted;
+      quoteMakeTarget(DepTarget, Quoted);
+      CmdArgs.push_back(Args.MakeArgString(Quoted));
+    }
+
+    if (ArgM->getOption().matches(options::OPT_M) ||
+        ArgM->getOption().matches(options::OPT_MD))
+      CmdArgs.push_back("-sys-header-deps");
+    if ((isa<PrecompileJobAction>(JA) &&
+         !Args.hasArg(options::OPT_fno_module_file_deps)) ||
+        Args.hasArg(options::OPT_fmodule_file_deps))
+      CmdArgs.push_back("-module-file-deps");
+  }
+
+  if (Args.hasArg(options::OPT_MG)) {
+    if (!ArgM || ArgM->getOption().matches(options::OPT_MD) ||
+        ArgM->getOption().matches(options::OPT_MMD))
+      D.Diag(diag::err_drv_mg_requires_m_or_mm);
+    CmdArgs.push_back("-MG");
+  }
+
+  Args.AddLastArg(CmdArgs, options::OPT_MP);
+  Args.AddLastArg(CmdArgs, options::OPT_MV);
+
+  // Add offload include arguments specific for CUDA/HIP.  This must happen
+  // before we -I or -include anything else, because we must pick up the
+  // CUDA/HIP headers from the particular CUDA/ROCm installation, rather than
+  // from e.g. /usr/local/include.
+  if (JA.isOffloading(Action::OFK_Cuda))
+    getToolChain().AddCudaIncludeArgs(Args, CmdArgs);
+  if (JA.isOffloading(Action::OFK_HIP))
+    getToolChain().AddHIPIncludeArgs(Args, CmdArgs);
+
+  // If we are offloading to a target via OpenMP we need to include the
+  // openmp_wrappers folder which contains alternative system headers.
+  if (JA.isDeviceOffloading(Action::OFK_OpenMP) &&
+      !Args.hasArg(options::OPT_nostdinc) &&
+      !Args.hasArg(options::OPT_nogpuinc) &&
+      (getToolChain().getTriple().isNVPTX() ||
+       getToolChain().getTriple().isAMDGCN())) {
+    if (!Args.hasArg(options::OPT_nobuiltininc)) {
+      // Add openmp_wrappers/* to our system include path.  This lets us wrap
+      // standard library headers.
+      SmallString<128> P(D.ResourceDir);
+      llvm::sys::path::append(P, "include");
+      llvm::sys::path::append(P, "openmp_wrappers");
+      CmdArgs.push_back("-internal-isystem");
+      CmdArgs.push_back(Args.MakeArgString(P));
+    }
+
+    CmdArgs.push_back("-include");
+    CmdArgs.push_back("__clang_openmp_device_functions.h");
+  }
+
+  // Add -i* options, and automatically translate to
+  // -include-pch/-include-pth for transparent PCH support. It's
+  // wonky, but we include looking for .gch so we can support seamless
+  // replacement into a build system already set up to be generating
+  // .gch files.
+
+  if (getToolChain().getDriver().IsCLMode()) {
+    const Arg *YcArg = Args.getLastArg(options::OPT__SLASH_Yc);
+    const Arg *YuArg = Args.getLastArg(options::OPT__SLASH_Yu);
+    if (YcArg && JA.getKind() >= Action::PrecompileJobClass &&
+        JA.getKind() <= Action::AssembleJobClass) {
+      CmdArgs.push_back(Args.MakeArgString("-building-pch-with-obj"));
+      // -fpch-instantiate-templates is the default when creating
+      // precomp using /Yc
+      if (Args.hasFlag(options::OPT_fpch_instantiate_templates,
+                       options::OPT_fno_pch_instantiate_templates, true))
+        CmdArgs.push_back(Args.MakeArgString("-fpch-instantiate-templates"));
+    }
+    if (YcArg || YuArg) {
+      StringRef ThroughHeader = YcArg ? YcArg->getValue() : YuArg->getValue();
+      if (!isa<PrecompileJobAction>(JA)) {
+        CmdArgs.push_back("-include-pch");
+        CmdArgs.push_back(Args.MakeArgString(D.GetClPchPath(
+            C, !ThroughHeader.empty()
+                   ? ThroughHeader
+                   : llvm::sys::path::filename(Inputs[0].getBaseInput()))));
+      }
+
+      if (ThroughHeader.empty()) {
+        CmdArgs.push_back(Args.MakeArgString(
+            Twine("-pch-through-hdrstop-") + (YcArg ? "create" : "use")));
+      } else {
+        CmdArgs.push_back(
+            Args.MakeArgString(Twine("-pch-through-header=") + ThroughHeader));
+      }
+    }
+  }
+
+  bool RenderedImplicitInclude = false;
+  for (const Arg *A : Args.filtered(options::OPT_clang_i_Group)) {
+    if (A->getOption().matches(options::OPT_include) &&
+        D.getProbePrecompiled()) {
+      // Handling of gcc-style gch precompiled headers.
+      bool IsFirstImplicitInclude = !RenderedImplicitInclude;
+      RenderedImplicitInclude = true;
+
+      bool FoundPCH = false;
+      SmallString<128> P(A->getValue());
+      // We want the files to have a name like foo.h.pch. Add a dummy extension
+      // so that replace_extension does the right thing.
+      P += ".dummy";
+      llvm::sys::path::replace_extension(P, "pch");
+      if (D.getVFS().exists(P))
+        FoundPCH = true;
+
+      if (!FoundPCH) {
+        llvm::sys::path::replace_extension(P, "gch");
+        if (D.getVFS().exists(P)) {
+          FoundPCH = true;
+        }
+      }
+
+      if (FoundPCH) {
+        if (IsFirstImplicitInclude) {
+          A->claim();
+          CmdArgs.push_back("-include-pch");
+          CmdArgs.push_back(Args.MakeArgString(P));
+          continue;
+        } else {
+          // Ignore the PCH if not first on command line and emit warning.
+          D.Diag(diag::warn_drv_pch_not_first_include) << P
+                                                       << A->getAsString(Args);
+        }
+      }
+    } else if (A->getOption().matches(options::OPT_isystem_after)) {
+      // Handling of paths which must come late.  These entries are handled by
+      // the toolchain itself after the resource dir is inserted in the right
+      // search order.
+      // Do not claim the argument so that the use of the argument does not
+      // silently go unnoticed on toolchains which do not honour the option.
+      continue;
+    } else if (A->getOption().matches(options::OPT_stdlibxx_isystem)) {
+      // Translated to -internal-isystem by the driver, no need to pass to cc1.
+      continue;
+    }
+
+    // Not translated, render as usual.
+    A->claim();
+    A->render(Args, CmdArgs);
+  }
+
+  Args.AddAllArgs(CmdArgs,
+                  {options::OPT_D, options::OPT_U, options::OPT_I_Group,
+                   options::OPT_F, options::OPT_index_header_map});
+
+  // Add -Wp, and -Xpreprocessor if using the preprocessor.
+
+  // FIXME: There is a very unfortunate problem here, some troubled
+  // souls abuse -Wp, to pass preprocessor options in gcc syntax. To
+  // really support that we would have to parse and then translate
+  // those options. :(
+  Args.AddAllArgValues(CmdArgs, options::OPT_Wp_COMMA,
+                       options::OPT_Xpreprocessor);
+
+  // -I- is a deprecated GCC feature, reject it.
+  if (Arg *A = Args.getLastArg(options::OPT_I_))
+    D.Diag(diag::err_drv_I_dash_not_supported) << A->getAsString(Args);
+
+  // If we have a --sysroot, and don't have an explicit -isysroot flag, add an
+  // -isysroot to the CC1 invocation.
+  StringRef sysroot = C.getSysRoot();
+  if (sysroot != "") {
+    if (!Args.hasArg(options::OPT_isysroot)) {
+      CmdArgs.push_back("-isysroot");
+      CmdArgs.push_back(C.getArgs().MakeArgString(sysroot));
+    }
+  }
+
+  // Parse additional include paths from environment variables.
+  // FIXME: We should probably sink the logic for handling these from the
+  // frontend into the driver. It will allow deleting 4 otherwise unused flags.
+  // CPATH - included following the user specified includes (but prior to
+  // builtin and standard includes).
+  addDirectoryList(Args, CmdArgs, "-I", "CPATH");
+  // C_INCLUDE_PATH - system includes enabled when compiling C.
+  addDirectoryList(Args, CmdArgs, "-c-isystem", "C_INCLUDE_PATH");
+  // CPLUS_INCLUDE_PATH - system includes enabled when compiling C++.
+  addDirectoryList(Args, CmdArgs, "-cxx-isystem", "CPLUS_INCLUDE_PATH");
+  // OBJC_INCLUDE_PATH - system includes enabled when compiling ObjC.
+  addDirectoryList(Args, CmdArgs, "-objc-isystem", "OBJC_INCLUDE_PATH");
+  // OBJCPLUS_INCLUDE_PATH - system includes enabled when compiling ObjC++.
+  addDirectoryList(Args, CmdArgs, "-objcxx-isystem", "OBJCPLUS_INCLUDE_PATH");
+
+  if (Args.hasArg(options::OPT_fcase_insensitive_paths))
+    CmdArgs.push_back("-fcase-insensitive-paths");
+
+  // While adding the include arguments, we also attempt to retrieve the
+  // arguments of related offloading toolchains or arguments that are specific
+  // of an offloading programming model.
+
+  // Add C++ include arguments, if needed.
+  if (types::isCXX(Inputs[0].getType())) {
+    bool HasStdlibxxIsystem = Args.hasArg(options::OPT_stdlibxx_isystem);
+    forAllAssociatedToolChains(
+        C, JA, getToolChain(),
+        [&Args, &CmdArgs, HasStdlibxxIsystem](const ToolChain &TC) {
+          HasStdlibxxIsystem ? TC.AddClangCXXStdlibIsystemArgs(Args, CmdArgs)
+                             : TC.AddClangCXXStdlibIncludeArgs(Args, CmdArgs);
+        });
+  }
+
+  // Add system include arguments for all targets but IAMCU.
+  if (!IsIAMCU)
+    forAllAssociatedToolChains(C, JA, getToolChain(),
+                               [&Args, &CmdArgs](const ToolChain &TC) {
+                                 TC.AddClangSystemIncludeArgs(Args, CmdArgs);
+                               });
+  else {
+    // For IAMCU add special include arguments.
+    getToolChain().AddIAMCUIncludeArgs(Args, CmdArgs);
+  }
+
+  addMacroPrefixMapArg(D, Args, CmdArgs);
+  addCoveragePrefixMapArg(D, Args, CmdArgs);
+
+  Args.AddLastArg(CmdArgs, options::OPT_ffile_reproducible,
+                  options::OPT_fno_file_reproducible);
+
+  if (const char *Epoch = std::getenv("SOURCE_DATE_EPOCH")) {
+    CmdArgs.push_back("-source-date-epoch");
+    CmdArgs.push_back(Args.MakeArgString(Epoch));
+  }
+}
+
+// FIXME: Move to target hook.
+static bool isSignedCharDefault(const llvm::Triple &Triple) {
+  switch (Triple.getArch()) {
+  default:
+    return true;
+
+  case llvm::Triple::aarch64:
+  case llvm::Triple::aarch64_32:
+  case llvm::Triple::aarch64_be:
+  case llvm::Triple::arm:
+  case llvm::Triple::armeb:
+  case llvm::Triple::thumb:
+  case llvm::Triple::thumbeb:
+    if (Triple.isOSDarwin() || Triple.isOSWindows())
+      return true;
+    return false;
+
+  case llvm::Triple::ppc:
+  case llvm::Triple::ppc64:
+    if (Triple.isOSDarwin())
+      return true;
+    return false;
+
+  case llvm::Triple::hexagon:
+  case llvm::Triple::ppcle:
+  case llvm::Triple::ppc64le:
+  case llvm::Triple::riscv32:
+  case llvm::Triple::riscv64:
+  case llvm::Triple::systemz:
+  case llvm::Triple::xcore:
+    return false;
+  }
+}
+
+static bool hasMultipleInvocations(const llvm::Triple &Triple,
+                                   const ArgList &Args) {
+  // Supported only on Darwin where we invoke the compiler multiple times
+  // followed by an invocation to lipo.
+  if (!Triple.isOSDarwin())
+    return false;
+  // If more than one "-arch <arch>" is specified, we're targeting multiple
+  // architectures resulting in a fat binary.
+  return Args.getAllArgValues(options::OPT_arch).size() > 1;
+}
+
+static bool checkRemarksOptions(const Driver &D, const ArgList &Args,
+                                const llvm::Triple &Triple) {
+  // When enabling remarks, we need to error if:
+  // * The remark file is specified but we're targeting multiple architectures,
+  // which means more than one remark file is being generated.
+  bool hasMultipleInvocations = ::hasMultipleInvocations(Triple, Args);
+  bool hasExplicitOutputFile =
+      Args.getLastArg(options::OPT_foptimization_record_file_EQ);
+  if (hasMultipleInvocations && hasExplicitOutputFile) {
+    D.Diag(diag::err_drv_invalid_output_with_multiple_archs)
+        << "-foptimization-record-file";
+    return false;
+  }
+  return true;
+}
+
+static void renderRemarksOptions(const ArgList &Args, ArgStringList &CmdArgs,
+                                 const llvm::Triple &Triple,
+                                 const InputInfo &Input,
+                                 const InputInfo &Output, const JobAction &JA) {
+  StringRef Format = "yaml";
+  if (const Arg *A = Args.getLastArg(options::OPT_fsave_optimization_record_EQ))
+    Format = A->getValue();
+
+  CmdArgs.push_back("-opt-record-file");
+
+  const Arg *A = Args.getLastArg(options::OPT_foptimization_record_file_EQ);
+  if (A) {
+    CmdArgs.push_back(A->getValue());
+  } else {
+    bool hasMultipleArchs =
+        Triple.isOSDarwin() && // Only supported on Darwin platforms.
+        Args.getAllArgValues(options::OPT_arch).size() > 1;
+
+    SmallString<128> F;
+
+    if (Args.hasArg(options::OPT_c) || Args.hasArg(options::OPT_S)) {
+      if (Arg *FinalOutput = Args.getLastArg(options::OPT_o))
+        F = FinalOutput->getValue();
+    } else {
+      if (Format != "yaml" && // For YAML, keep the original behavior.
+          Triple.isOSDarwin() && // Enable this only on darwin, since it's the only platform supporting .dSYM bundles.
+          Output.isFilename())
+        F = Output.getFilename();
+    }
+
+    if (F.empty()) {
+      // Use the input filename.
+      F = llvm::sys::path::stem(Input.getBaseInput());
+
+      // If we're compiling for an offload architecture (i.e. a CUDA device),
+      // we need to make the file name for the device compilation different
+      // from the host compilation.
+      if (!JA.isDeviceOffloading(Action::OFK_None) &&
+          !JA.isDeviceOffloading(Action::OFK_Host)) {
+        llvm::sys::path::replace_extension(F, "");
+        F += Action::GetOffloadingFileNamePrefix(JA.getOffloadingDeviceKind(),
+                                                 Triple.normalize());
+        F += "-";
+        F += JA.getOffloadingArch();
+      }
+    }
+
+    // If we're having more than one "-arch", we should name the files
+    // differently so that every cc1 invocation writes to a different file.
+    // We're doing that by appending "-<arch>" with "<arch>" being the arch
+    // name from the triple.
+    if (hasMultipleArchs) {
+      // First, remember the extension.
+      SmallString<64> OldExtension = llvm::sys::path::extension(F);
+      // then, remove it.
+      llvm::sys::path::replace_extension(F, "");
+      // attach -<arch> to it.
+      F += "-";
+      F += Triple.getArchName();
+      // put back the extension.
+      llvm::sys::path::replace_extension(F, OldExtension);
+    }
+
+    SmallString<32> Extension;
+    Extension += "opt.";
+    Extension += Format;
+
+    llvm::sys::path::replace_extension(F, Extension);
+    CmdArgs.push_back(Args.MakeArgString(F));
+  }
+
+  if (const Arg *A =
+          Args.getLastArg(options::OPT_foptimization_record_passes_EQ)) {
+    CmdArgs.push_back("-opt-record-passes");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  if (!Format.empty()) {
+    CmdArgs.push_back("-opt-record-format");
+    CmdArgs.push_back(Format.data());
+  }
+}
+
+void AddAAPCSVolatileBitfieldArgs(const ArgList &Args, ArgStringList &CmdArgs) {
+  if (!Args.hasFlag(options::OPT_faapcs_bitfield_width,
+                    options::OPT_fno_aapcs_bitfield_width, true))
+    CmdArgs.push_back("-fno-aapcs-bitfield-width");
+
+  if (Args.getLastArg(options::OPT_ForceAAPCSBitfieldLoad))
+    CmdArgs.push_back("-faapcs-bitfield-load");
+}
+
+namespace {
+void RenderARMABI(const Driver &D, const llvm::Triple &Triple,
+                  const ArgList &Args, ArgStringList &CmdArgs) {
+  // Select the ABI to use.
+  // FIXME: Support -meabi.
+  // FIXME: Parts of this are duplicated in the backend, unify this somehow.
+  const char *ABIName = nullptr;
+  if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ)) {
+    ABIName = A->getValue();
+  } else {
+    std::string CPU = getCPUName(D, Args, Triple, /*FromAs*/ false);
+    ABIName = llvm::ARM::computeDefaultTargetABI(Triple, CPU).data();
+  }
+
+  CmdArgs.push_back("-target-abi");
+  CmdArgs.push_back(ABIName);
+}
+
+void AddUnalignedAccessWarning(ArgStringList &CmdArgs) {
+  auto StrictAlignIter =
+      llvm::find_if(llvm::reverse(CmdArgs), [](StringRef Arg) {
+        return Arg == "+strict-align" || Arg == "-strict-align";
+      });
+  if (StrictAlignIter != CmdArgs.rend() &&
+      StringRef(*StrictAlignIter) == "+strict-align")
+    CmdArgs.push_back("-Wunaligned-access");
+}
+}
+
+static void CollectARMPACBTIOptions(const ToolChain &TC, const ArgList &Args,
+                                    ArgStringList &CmdArgs, bool isAArch64) {
+  const Arg *A = isAArch64
+                     ? Args.getLastArg(options::OPT_msign_return_address_EQ,
+                                       options::OPT_mbranch_protection_EQ)
+                     : Args.getLastArg(options::OPT_mbranch_protection_EQ);
+  if (!A)
+    return;
+
+  const Driver &D = TC.getDriver();
+  const llvm::Triple &Triple = TC.getEffectiveTriple();
+  if (!(isAArch64 || (Triple.isArmT32() && Triple.isArmMClass())))
+    D.Diag(diag::warn_incompatible_branch_protection_option)
+        << Triple.getArchName();
+
+  StringRef Scope, Key;
+  bool IndirectBranches;
+
+  if (A->getOption().matches(options::OPT_msign_return_address_EQ)) {
+    Scope = A->getValue();
+    if (Scope != "none" && Scope != "non-leaf" && Scope != "all")
+      D.Diag(diag::err_drv_unsupported_option_argument)
+          << A->getSpelling() << Scope;
+    Key = "a_key";
+    IndirectBranches = false;
+  } else {
+    StringRef DiagMsg;
+    llvm::ARM::ParsedBranchProtection PBP;
+    if (!llvm::ARM::parseBranchProtection(A->getValue(), PBP, DiagMsg))
+      D.Diag(diag::err_drv_unsupported_option_argument)
+          << A->getSpelling() << DiagMsg;
+    if (!isAArch64 && PBP.Key == "b_key")
+      D.Diag(diag::warn_unsupported_branch_protection)
+          << "b-key" << A->getAsString(Args);
+    Scope = PBP.Scope;
+    Key = PBP.Key;
+    IndirectBranches = PBP.BranchTargetEnforcement;
+  }
+
+  CmdArgs.push_back(
+      Args.MakeArgString(Twine("-msign-return-address=") + Scope));
+  if (!Scope.equals("none"))
+    CmdArgs.push_back(
+        Args.MakeArgString(Twine("-msign-return-address-key=") + Key));
+  if (IndirectBranches)
+    CmdArgs.push_back("-mbranch-target-enforce");
+}
+
+void Clang::AddARMTargetArgs(const llvm::Triple &Triple, const ArgList &Args,
+                             ArgStringList &CmdArgs, bool KernelOrKext) const {
+  RenderARMABI(getToolChain().getDriver(), Triple, Args, CmdArgs);
+
+  // Determine floating point ABI from the options & target defaults.
+  arm::FloatABI ABI = arm::getARMFloatABI(getToolChain(), Args);
+  if (ABI == arm::FloatABI::Soft) {
+    // Floating point operations and argument passing are soft.
+    // FIXME: This changes CPP defines, we need -target-soft-float.
+    CmdArgs.push_back("-msoft-float");
+    CmdArgs.push_back("-mfloat-abi");
+    CmdArgs.push_back("soft");
+  } else if (ABI == arm::FloatABI::SoftFP) {
+    // Floating point operations are hard, but argument passing is soft.
+    CmdArgs.push_back("-mfloat-abi");
+    CmdArgs.push_back("soft");
+  } else {
+    // Floating point operations and argument passing are hard.
+    assert(ABI == arm::FloatABI::Hard && "Invalid float abi!");
+    CmdArgs.push_back("-mfloat-abi");
+    CmdArgs.push_back("hard");
+  }
+
+  // Forward the -mglobal-merge option for explicit control over the pass.
+  if (Arg *A = Args.getLastArg(options::OPT_mglobal_merge,
+                               options::OPT_mno_global_merge)) {
+    CmdArgs.push_back("-mllvm");
+    if (A->getOption().matches(options::OPT_mno_global_merge))
+      CmdArgs.push_back("-arm-global-merge=false");
+    else
+      CmdArgs.push_back("-arm-global-merge=true");
+  }
+
+  if (!Args.hasFlag(options::OPT_mimplicit_float,
+                    options::OPT_mno_implicit_float, true))
+    CmdArgs.push_back("-no-implicit-float");
+
+  if (Args.getLastArg(options::OPT_mcmse))
+    CmdArgs.push_back("-mcmse");
+
+  AddAAPCSVolatileBitfieldArgs(Args, CmdArgs);
+
+  // Enable/disable return address signing and indirect branch targets.
+  CollectARMPACBTIOptions(getToolChain(), Args, CmdArgs, false /*isAArch64*/);
+
+  AddUnalignedAccessWarning(CmdArgs);
+}
+
+void Clang::RenderTargetOptions(const llvm::Triple &EffectiveTriple,
+                                const ArgList &Args, bool KernelOrKext,
+                                ArgStringList &CmdArgs) const {
+  const ToolChain &TC = getToolChain();
+
+  // Add the target features
+  getTargetFeatures(TC.getDriver(), EffectiveTriple, Args, CmdArgs, false);
+
+  // Add target specific flags.
+  switch (TC.getArch()) {
+  default:
+    break;
+
+  case llvm::Triple::arm:
+  case llvm::Triple::armeb:
+  case llvm::Triple::thumb:
+  case llvm::Triple::thumbeb:
+    // Use the effective triple, which takes into account the deployment target.
+    AddARMTargetArgs(EffectiveTriple, Args, CmdArgs, KernelOrKext);
+    break;
+
+  case llvm::Triple::aarch64:
+  case llvm::Triple::aarch64_32:
+  case llvm::Triple::aarch64_be:
+    AddAArch64TargetArgs(Args, CmdArgs);
+    break;
+
+  case llvm::Triple::loongarch32:
+  case llvm::Triple::loongarch64:
+    AddLoongArchTargetArgs(Args, CmdArgs);
+    break;
+
+  case llvm::Triple::mips:
+  case llvm::Triple::mipsel:
+  case llvm::Triple::mips64:
+  case llvm::Triple::mips64el:
+    AddMIPSTargetArgs(Args, CmdArgs);
+    break;
+
+  case llvm::Triple::ppc:
+  case llvm::Triple::ppcle:
+  case llvm::Triple::ppc64:
+  case llvm::Triple::ppc64le:
+    AddPPCTargetArgs(Args, CmdArgs);
+    break;
+
+  case llvm::Triple::riscv32:
+  case llvm::Triple::riscv64:
+    AddRISCVTargetArgs(Args, CmdArgs);
+    break;
+
+  case llvm::Triple::sparc:
+  case llvm::Triple::sparcel:
+  case llvm::Triple::sparcv9:
+    AddSparcTargetArgs(Args, CmdArgs);
+    break;
+
+  case llvm::Triple::systemz:
+    AddSystemZTargetArgs(Args, CmdArgs);
+    break;
+
+  case llvm::Triple::x86:
+  case llvm::Triple::x86_64:
+    AddX86TargetArgs(Args, CmdArgs);
+    break;
+
+  case llvm::Triple::lanai:
+    AddLanaiTargetArgs(Args, CmdArgs);
+    break;
+
+  case llvm::Triple::hexagon:
+    AddHexagonTargetArgs(Args, CmdArgs);
+    break;
+
+  case llvm::Triple::wasm32:
+  case llvm::Triple::wasm64:
+    AddWebAssemblyTargetArgs(Args, CmdArgs);
+    break;
+
+  case llvm::Triple::ve:
+    AddVETargetArgs(Args, CmdArgs);
+    break;
+  }
+}
+
+namespace {
+void RenderAArch64ABI(const llvm::Triple &Triple, const ArgList &Args,
+                      ArgStringList &CmdArgs) {
+  const char *ABIName = nullptr;
+  if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ))
+    ABIName = A->getValue();
+  else if (Triple.isOSDarwin())
+    ABIName = "darwinpcs";
+  else
+    ABIName = "aapcs";
+
+  CmdArgs.push_back("-target-abi");
+  CmdArgs.push_back(ABIName);
+}
+}
+
+void Clang::AddAArch64TargetArgs(const ArgList &Args,
+                                 ArgStringList &CmdArgs) const {
+  const llvm::Triple &Triple = getToolChain().getEffectiveTriple();
+
+  if (!Args.hasFlag(options::OPT_mred_zone, options::OPT_mno_red_zone, true) ||
+      Args.hasArg(options::OPT_mkernel) ||
+      Args.hasArg(options::OPT_fapple_kext))
+    CmdArgs.push_back("-disable-red-zone");
+
+  if (!Args.hasFlag(options::OPT_mimplicit_float,
+                    options::OPT_mno_implicit_float, true))
+    CmdArgs.push_back("-no-implicit-float");
+
+  RenderAArch64ABI(Triple, Args, CmdArgs);
+
+  // Forward the -mglobal-merge option for explicit control over the pass.
+  if (Arg *A = Args.getLastArg(options::OPT_mglobal_merge,
+                               options::OPT_mno_global_merge)) {
+    CmdArgs.push_back("-mllvm");
+    if (A->getOption().matches(options::OPT_mno_global_merge))
+      CmdArgs.push_back("-aarch64-enable-global-merge=false");
+    else
+      CmdArgs.push_back("-aarch64-enable-global-merge=true");
+  }
+
+  // Enable/disable return address signing and indirect branch targets.
+  CollectARMPACBTIOptions(getToolChain(), Args, CmdArgs, true /*isAArch64*/);
+
+  // Handle -msve_vector_bits=<bits>
+  if (Arg *A = Args.getLastArg(options::OPT_msve_vector_bits_EQ)) {
+    StringRef Val = A->getValue();
+    const Driver &D = getToolChain().getDriver();
+    if (Val.equals("128") || Val.equals("256") || Val.equals("512") ||
+        Val.equals("1024") || Val.equals("2048") || Val.equals("128+") ||
+        Val.equals("256+") || Val.equals("512+") || Val.equals("1024+") ||
+        Val.equals("2048+")) {
+      unsigned Bits = 0;
+      if (Val.endswith("+"))
+        Val = Val.substr(0, Val.size() - 1);
+      else {
+        bool Invalid = Val.getAsInteger(10, Bits); (void)Invalid;
+        assert(!Invalid && "Failed to parse value");
+        CmdArgs.push_back(
+            Args.MakeArgString("-mvscale-max=" + llvm::Twine(Bits / 128)));
+      }
+
+      bool Invalid = Val.getAsInteger(10, Bits); (void)Invalid;
+      assert(!Invalid && "Failed to parse value");
+      CmdArgs.push_back(
+          Args.MakeArgString("-mvscale-min=" + llvm::Twine(Bits / 128)));
+    // Silently drop requests for vector-length agnostic code as it's implied.
+    } else if (!Val.equals("scalable"))
+      // Handle the unsupported values passed to msve-vector-bits.
+      D.Diag(diag::err_drv_unsupported_option_argument)
+          << A->getSpelling() << Val;
+  }
+
+  AddAAPCSVolatileBitfieldArgs(Args, CmdArgs);
+
+  if (const Arg *A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ)) {
+    CmdArgs.push_back("-tune-cpu");
+    if (strcmp(A->getValue(), "native") == 0)
+      CmdArgs.push_back(Args.MakeArgString(llvm::sys::getHostCPUName()));
+    else
+      CmdArgs.push_back(A->getValue());
+  }
+
+  AddUnalignedAccessWarning(CmdArgs);
+}
+
+void Clang::AddLoongArchTargetArgs(const ArgList &Args,
+                                   ArgStringList &CmdArgs) const {
+  CmdArgs.push_back("-target-abi");
+  CmdArgs.push_back(loongarch::getLoongArchABI(getToolChain().getDriver(), Args,
+                                               getToolChain().getTriple())
+                        .data());
+}
+
+void Clang::AddMIPSTargetArgs(const ArgList &Args,
+                              ArgStringList &CmdArgs) const {
+  const Driver &D = getToolChain().getDriver();
+  StringRef CPUName;
+  StringRef ABIName;
+  const llvm::Triple &Triple = getToolChain().getTriple();
+  mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName);
+
+  CmdArgs.push_back("-target-abi");
+  CmdArgs.push_back(ABIName.data());
+
+  mips::FloatABI ABI = mips::getMipsFloatABI(D, Args, Triple);
+  if (ABI == mips::FloatABI::Soft) {
+    // Floating point operations and argument passing are soft.
+    CmdArgs.push_back("-msoft-float");
+    CmdArgs.push_back("-mfloat-abi");
+    CmdArgs.push_back("soft");
+  } else {
+    // Floating point operations and argument passing are hard.
+    assert(ABI == mips::FloatABI::Hard && "Invalid float abi!");
+    CmdArgs.push_back("-mfloat-abi");
+    CmdArgs.push_back("hard");
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_mldc1_sdc1,
+                               options::OPT_mno_ldc1_sdc1)) {
+    if (A->getOption().matches(options::OPT_mno_ldc1_sdc1)) {
+      CmdArgs.push_back("-mllvm");
+      CmdArgs.push_back("-mno-ldc1-sdc1");
+    }
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_mcheck_zero_division,
+                               options::OPT_mno_check_zero_division)) {
+    if (A->getOption().matches(options::OPT_mno_check_zero_division)) {
+      CmdArgs.push_back("-mllvm");
+      CmdArgs.push_back("-mno-check-zero-division");
+    }
+  }
+
+  if (Args.getLastArg(options::OPT_mfix4300)) {
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back("-mfix4300");
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_G)) {
+    StringRef v = A->getValue();
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back(Args.MakeArgString("-mips-ssection-threshold=" + v));
+    A->claim();
+  }
+
+  Arg *GPOpt = Args.getLastArg(options::OPT_mgpopt, options::OPT_mno_gpopt);
+  Arg *ABICalls =
+      Args.getLastArg(options::OPT_mabicalls, options::OPT_mno_abicalls);
+
+  // -mabicalls is the default for many MIPS environments, even with -fno-pic.
+  // -mgpopt is the default for static, -fno-pic environments but these two
+  // options conflict. We want to be certain that -mno-abicalls -mgpopt is
+  // the only case where -mllvm -mgpopt is passed.
+  // NOTE: We need a warning here or in the backend to warn when -mgpopt is
+  //       passed explicitly when compiling something with -mabicalls
+  //       (implictly) in affect. Currently the warning is in the backend.
+  //
+  // When the ABI in use is  N64, we also need to determine the PIC mode that
+  // is in use, as -fno-pic for N64 implies -mno-abicalls.
+  bool NoABICalls =
+      ABICalls && ABICalls->getOption().matches(options::OPT_mno_abicalls);
+
+  llvm::Reloc::Model RelocationModel;
+  unsigned PICLevel;
+  bool IsPIE;
+  std::tie(RelocationModel, PICLevel, IsPIE) =
+      ParsePICArgs(getToolChain(), Args);
+
+  NoABICalls = NoABICalls ||
+               (RelocationModel == llvm::Reloc::Static && ABIName == "n64");
+
+  bool WantGPOpt = GPOpt && GPOpt->getOption().matches(options::OPT_mgpopt);
+  // We quietly ignore -mno-gpopt as the backend defaults to -mno-gpopt.
+  if (NoABICalls && (!GPOpt || WantGPOpt)) {
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back("-mgpopt");
+
+    Arg *LocalSData = Args.getLastArg(options::OPT_mlocal_sdata,
+                                      options::OPT_mno_local_sdata);
+    Arg *ExternSData = Args.getLastArg(options::OPT_mextern_sdata,
+                                       options::OPT_mno_extern_sdata);
+    Arg *EmbeddedData = Args.getLastArg(options::OPT_membedded_data,
+                                        options::OPT_mno_embedded_data);
+    if (LocalSData) {
+      CmdArgs.push_back("-mllvm");
+      if (LocalSData->getOption().matches(options::OPT_mlocal_sdata)) {
+        CmdArgs.push_back("-mlocal-sdata=1");
+      } else {
+        CmdArgs.push_back("-mlocal-sdata=0");
+      }
+      LocalSData->claim();
+    }
+
+    if (ExternSData) {
+      CmdArgs.push_back("-mllvm");
+      if (ExternSData->getOption().matches(options::OPT_mextern_sdata)) {
+        CmdArgs.push_back("-mextern-sdata=1");
+      } else {
+        CmdArgs.push_back("-mextern-sdata=0");
+      }
+      ExternSData->claim();
+    }
+
+    if (EmbeddedData) {
+      CmdArgs.push_back("-mllvm");
+      if (EmbeddedData->getOption().matches(options::OPT_membedded_data)) {
+        CmdArgs.push_back("-membedded-data=1");
+      } else {
+        CmdArgs.push_back("-membedded-data=0");
+      }
+      EmbeddedData->claim();
+    }
+
+  } else if ((!ABICalls || (!NoABICalls && ABICalls)) && WantGPOpt)
+    D.Diag(diag::warn_drv_unsupported_gpopt) << (ABICalls ? 0 : 1);
+
+  if (GPOpt)
+    GPOpt->claim();
+
+  if (Arg *A = Args.getLastArg(options::OPT_mcompact_branches_EQ)) {
+    StringRef Val = StringRef(A->getValue());
+    if (mips::hasCompactBranches(CPUName)) {
+      if (Val == "never" || Val == "always" || Val == "optimal") {
+        CmdArgs.push_back("-mllvm");
+        CmdArgs.push_back(Args.MakeArgString("-mips-compact-branches=" + Val));
+      } else
+        D.Diag(diag::err_drv_unsupported_option_argument)
+            << A->getSpelling() << Val;
+    } else
+      D.Diag(diag::warn_target_unsupported_compact_branches) << CPUName;
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_mrelax_pic_calls,
+                               options::OPT_mno_relax_pic_calls)) {
+    if (A->getOption().matches(options::OPT_mno_relax_pic_calls)) {
+      CmdArgs.push_back("-mllvm");
+      CmdArgs.push_back("-mips-jalr-reloc=0");
+    }
+  }
+}
+
+void Clang::AddPPCTargetArgs(const ArgList &Args,
+                             ArgStringList &CmdArgs) const {
+  const llvm::Triple &T = getToolChain().getTriple();
+  if (const Arg *A = Args.getLastArg(options::OPT_mtune_EQ)) {
+    CmdArgs.push_back("-tune-cpu");
+    std::string CPU = ppc::getPPCTuneCPU(Args, T);
+    CmdArgs.push_back(Args.MakeArgString(CPU));
+  }
+
+  // Select the ABI to use.
+  const char *ABIName = nullptr;
+  if (T.isOSBinFormatELF()) {
+    switch (getToolChain().getArch()) {
+    case llvm::Triple::ppc64: {
+      if (T.isPPC64ELFv2ABI())
+        ABIName = "elfv2";
+      else
+        ABIName = "elfv1";
+      break;
+    }
+    case llvm::Triple::ppc64le:
+      ABIName = "elfv2";
+      break;
+    default:
+      break;
+    }
+  }
+
+  bool IEEELongDouble = getToolChain().defaultToIEEELongDouble();
+  for (const Arg *A : Args.filtered(options::OPT_mabi_EQ)) {
+    StringRef V = A->getValue();
+    if (V == "ieeelongdouble")
+      IEEELongDouble = true;
+    else if (V == "ibmlongdouble")
+      IEEELongDouble = false;
+    else if (V != "altivec")
+      // The ppc64 linux abis are all "altivec" abis by default. Accept and ignore
+      // the option if given as we don't have backend support for any targets
+      // that don't use the altivec abi.
+      ABIName = A->getValue();
+  }
+  if (IEEELongDouble)
+    CmdArgs.push_back("-mabi=ieeelongdouble");
+
+  ppc::FloatABI FloatABI =
+      ppc::getPPCFloatABI(getToolChain().getDriver(), Args);
+
+  if (FloatABI == ppc::FloatABI::Soft) {
+    // Floating point operations and argument passing are soft.
+    CmdArgs.push_back("-msoft-float");
+    CmdArgs.push_back("-mfloat-abi");
+    CmdArgs.push_back("soft");
+  } else {
+    // Floating point operations and argument passing are hard.
+    assert(FloatABI == ppc::FloatABI::Hard && "Invalid float abi!");
+    CmdArgs.push_back("-mfloat-abi");
+    CmdArgs.push_back("hard");
+  }
+
+  if (ABIName) {
+    CmdArgs.push_back("-target-abi");
+    CmdArgs.push_back(ABIName);
+  }
+}
+
+static void SetRISCVSmallDataLimit(const ToolChain &TC, const ArgList &Args,
+                                   ArgStringList &CmdArgs) {
+  const Driver &D = TC.getDriver();
+  const llvm::Triple &Triple = TC.getTriple();
+  // Default small data limitation is eight.
+  const char *SmallDataLimit = "8";
+  // Get small data limitation.
+  if (Args.getLastArg(options::OPT_shared, options::OPT_fpic,
+                      options::OPT_fPIC)) {
+    // Not support linker relaxation for PIC.
+    SmallDataLimit = "0";
+    if (Args.hasArg(options::OPT_G)) {
+      D.Diag(diag::warn_drv_unsupported_sdata);
+    }
+  } else if (Args.getLastArgValue(options::OPT_mcmodel_EQ)
+                 .equals_insensitive("large") &&
+             (Triple.getArch() == llvm::Triple::riscv64)) {
+    // Not support linker relaxation for RV64 with large code model.
+    SmallDataLimit = "0";
+    if (Args.hasArg(options::OPT_G)) {
+      D.Diag(diag::warn_drv_unsupported_sdata);
+    }
+  } else if (Arg *A = Args.getLastArg(options::OPT_G)) {
+    SmallDataLimit = A->getValue();
+  }
+  // Forward the -msmall-data-limit= option.
+  CmdArgs.push_back("-msmall-data-limit");
+  CmdArgs.push_back(SmallDataLimit);
+}
+
+void Clang::AddRISCVTargetArgs(const ArgList &Args,
+                               ArgStringList &CmdArgs) const {
+  const llvm::Triple &Triple = getToolChain().getTriple();
+  StringRef ABIName = riscv::getRISCVABI(Args, Triple);
+
+  CmdArgs.push_back("-target-abi");
+  CmdArgs.push_back(ABIName.data());
+
+  SetRISCVSmallDataLimit(getToolChain(), Args, CmdArgs);
+
+  if (!Args.hasFlag(options::OPT_mimplicit_float,
+                    options::OPT_mno_implicit_float, true))
+    CmdArgs.push_back("-no-implicit-float");
+
+  if (const Arg *A = Args.getLastArg(options::OPT_mtune_EQ)) {
+    CmdArgs.push_back("-tune-cpu");
+    if (strcmp(A->getValue(), "native") == 0)
+      CmdArgs.push_back(Args.MakeArgString(llvm::sys::getHostCPUName()));
+    else
+      CmdArgs.push_back(A->getValue());
+  }
+}
+
+void Clang::AddSparcTargetArgs(const ArgList &Args,
+                               ArgStringList &CmdArgs) const {
+  sparc::FloatABI FloatABI =
+      sparc::getSparcFloatABI(getToolChain().getDriver(), Args);
+
+  if (FloatABI == sparc::FloatABI::Soft) {
+    // Floating point operations and argument passing are soft.
+    CmdArgs.push_back("-msoft-float");
+    CmdArgs.push_back("-mfloat-abi");
+    CmdArgs.push_back("soft");
+  } else {
+    // Floating point operations and argument passing are hard.
+    assert(FloatABI == sparc::FloatABI::Hard && "Invalid float abi!");
+    CmdArgs.push_back("-mfloat-abi");
+    CmdArgs.push_back("hard");
+  }
+
+  if (const Arg *A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ)) {
+    StringRef Name = A->getValue();
+    std::string TuneCPU;
+    if (Name == "native")
+      TuneCPU = std::string(llvm::sys::getHostCPUName());
+    else
+      TuneCPU = std::string(Name);
+
+    CmdArgs.push_back("-tune-cpu");
+    CmdArgs.push_back(Args.MakeArgString(TuneCPU));
+  }
+}
+
+void Clang::AddSystemZTargetArgs(const ArgList &Args,
+                                 ArgStringList &CmdArgs) const {
+  if (const Arg *A = Args.getLastArg(options::OPT_mtune_EQ)) {
+    CmdArgs.push_back("-tune-cpu");
+    if (strcmp(A->getValue(), "native") == 0)
+      CmdArgs.push_back(Args.MakeArgString(llvm::sys::getHostCPUName()));
+    else
+      CmdArgs.push_back(A->getValue());
+  }
+
+  bool HasBackchain =
+      Args.hasFlag(options::OPT_mbackchain, options::OPT_mno_backchain, false);
+  bool HasPackedStack = Args.hasFlag(options::OPT_mpacked_stack,
+                                     options::OPT_mno_packed_stack, false);
+  systemz::FloatABI FloatABI =
+      systemz::getSystemZFloatABI(getToolChain().getDriver(), Args);
+  bool HasSoftFloat = (FloatABI == systemz::FloatABI::Soft);
+  if (HasBackchain && HasPackedStack && !HasSoftFloat) {
+    const Driver &D = getToolChain().getDriver();
+    D.Diag(diag::err_drv_unsupported_opt)
+      << "-mpacked-stack -mbackchain -mhard-float";
+  }
+  if (HasBackchain)
+    CmdArgs.push_back("-mbackchain");
+  if (HasPackedStack)
+    CmdArgs.push_back("-mpacked-stack");
+  if (HasSoftFloat) {
+    // Floating point operations and argument passing are soft.
+    CmdArgs.push_back("-msoft-float");
+    CmdArgs.push_back("-mfloat-abi");
+    CmdArgs.push_back("soft");
+  }
+}
+
+void Clang::AddX86TargetArgs(const ArgList &Args,
+                             ArgStringList &CmdArgs) const {
+  const Driver &D = getToolChain().getDriver();
+  addX86AlignBranchArgs(D, Args, CmdArgs, /*IsLTO=*/false);
+
+  if (!Args.hasFlag(options::OPT_mred_zone, options::OPT_mno_red_zone, true) ||
+      Args.hasArg(options::OPT_mkernel) ||
+      Args.hasArg(options::OPT_fapple_kext))
+    CmdArgs.push_back("-disable-red-zone");
+
+  if (!Args.hasFlag(options::OPT_mtls_direct_seg_refs,
+                    options::OPT_mno_tls_direct_seg_refs, true))
+    CmdArgs.push_back("-mno-tls-direct-seg-refs");
+
+  // Default to avoid implicit floating-point for kernel/kext code, but allow
+  // that to be overridden with -mno-soft-float.
+  bool NoImplicitFloat = (Args.hasArg(options::OPT_mkernel) ||
+                          Args.hasArg(options::OPT_fapple_kext));
+  if (Arg *A = Args.getLastArg(
+          options::OPT_msoft_float, options::OPT_mno_soft_float,
+          options::OPT_mimplicit_float, options::OPT_mno_implicit_float)) {
+    const Option &O = A->getOption();
+    NoImplicitFloat = (O.matches(options::OPT_mno_implicit_float) ||
+                       O.matches(options::OPT_msoft_float));
+  }
+  if (NoImplicitFloat)
+    CmdArgs.push_back("-no-implicit-float");
+
+  if (Arg *A = Args.getLastArg(options::OPT_masm_EQ)) {
+    StringRef Value = A->getValue();
+    if (Value == "intel" || Value == "att") {
+      CmdArgs.push_back("-mllvm");
+      CmdArgs.push_back(Args.MakeArgString("-x86-asm-syntax=" + Value));
+      CmdArgs.push_back(Args.MakeArgString("-inline-asm=" + Value));
+    } else {
+      D.Diag(diag::err_drv_unsupported_option_argument)
+          << A->getSpelling() << Value;
+    }
+  } else if (D.IsCLMode()) {
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back("-x86-asm-syntax=intel");
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_mskip_rax_setup,
+                               options::OPT_mno_skip_rax_setup))
+    if (A->getOption().matches(options::OPT_mskip_rax_setup))
+      CmdArgs.push_back(Args.MakeArgString("-mskip-rax-setup"));
+
+  // Set flags to support MCU ABI.
+  if (Args.hasFlag(options::OPT_miamcu, options::OPT_mno_iamcu, false)) {
+    CmdArgs.push_back("-mfloat-abi");
+    CmdArgs.push_back("soft");
+    CmdArgs.push_back("-mstack-alignment=4");
+  }
+
+  // Handle -mtune.
+
+  // Default to "generic" unless -march is present or targetting the PS4/PS5.
+  std::string TuneCPU;
+  if (!Args.hasArg(clang::driver::options::OPT_march_EQ) &&
+      !getToolChain().getTriple().isPS())
+    TuneCPU = "generic";
+
+  // Override based on -mtune.
+  if (const Arg *A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ)) {
+    StringRef Name = A->getValue();
+
+    if (Name == "native") {
+      Name = llvm::sys::getHostCPUName();
+      if (!Name.empty())
+        TuneCPU = std::string(Name);
+    } else
+      TuneCPU = std::string(Name);
+  }
+
+  if (!TuneCPU.empty()) {
+    CmdArgs.push_back("-tune-cpu");
+    CmdArgs.push_back(Args.MakeArgString(TuneCPU));
+  }
+}
+
+void Clang::AddHexagonTargetArgs(const ArgList &Args,
+                                 ArgStringList &CmdArgs) const {
+  CmdArgs.push_back("-mqdsp6-compat");
+  CmdArgs.push_back("-Wreturn-type");
+
+  if (auto G = toolchains::HexagonToolChain::getSmallDataThreshold(Args)) {
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back(
+        Args.MakeArgString("-hexagon-small-data-threshold=" + Twine(*G)));
+  }
+
+  if (!Args.hasArg(options::OPT_fno_short_enums))
+    CmdArgs.push_back("-fshort-enums");
+  if (Args.getLastArg(options::OPT_mieee_rnd_near)) {
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back("-enable-hexagon-ieee-rnd-near");
+  }
+  CmdArgs.push_back("-mllvm");
+  CmdArgs.push_back("-machine-sink-split=0");
+}
+
+void Clang::AddLanaiTargetArgs(const ArgList &Args,
+                               ArgStringList &CmdArgs) const {
+  if (Arg *A = Args.getLastArg(options::OPT_mcpu_EQ)) {
+    StringRef CPUName = A->getValue();
+
+    CmdArgs.push_back("-target-cpu");
+    CmdArgs.push_back(Args.MakeArgString(CPUName));
+  }
+  if (Arg *A = Args.getLastArg(options::OPT_mregparm_EQ)) {
+    StringRef Value = A->getValue();
+    // Only support mregparm=4 to support old usage. Report error for all other
+    // cases.
+    int Mregparm;
+    if (Value.getAsInteger(10, Mregparm)) {
+      if (Mregparm != 4) {
+        getToolChain().getDriver().Diag(
+            diag::err_drv_unsupported_option_argument)
+            << A->getSpelling() << Value;
+      }
+    }
+  }
+}
+
+void Clang::AddWebAssemblyTargetArgs(const ArgList &Args,
+                                     ArgStringList &CmdArgs) const {
+  // Default to "hidden" visibility.
+  if (!Args.hasArg(options::OPT_fvisibility_EQ,
+                   options::OPT_fvisibility_ms_compat))
+    CmdArgs.push_back("-fvisibility=hidden");
+}
+
+void Clang::AddVETargetArgs(const ArgList &Args, ArgStringList &CmdArgs) const {
+  // Floating point operations and argument passing are hard.
+  CmdArgs.push_back("-mfloat-abi");
+  CmdArgs.push_back("hard");
+}
+
+void Clang::DumpCompilationDatabase(Compilation &C, StringRef Filename,
+                                    StringRef Target, const InputInfo &Output,
+                                    const InputInfo &Input, const ArgList &Args) const {
+  // If this is a dry run, do not create the compilation database file.
+  if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH))
+    return;
+
+  using llvm::yaml::escape;
+  const Driver &D = getToolChain().getDriver();
+
+  if (!CompilationDatabase) {
+    std::error_code EC;
+    auto File = std::make_unique<llvm::raw_fd_ostream>(
+        Filename, EC,
+        llvm::sys::fs::OF_TextWithCRLF | llvm::sys::fs::OF_Append);
+    if (EC) {
+      D.Diag(clang::diag::err_drv_compilationdatabase) << Filename
+                                                       << EC.message();
+      return;
+    }
+    CompilationDatabase = std::move(File);
+  }
+  auto &CDB = *CompilationDatabase;
+  auto CWD = D.getVFS().getCurrentWorkingDirectory();
+  if (!CWD)
+    CWD = ".";
+  CDB << "{ \"directory\": \"" << escape(*CWD) << "\"";
+  CDB << ", \"file\": \"" << escape(Input.getFilename()) << "\"";
+  CDB << ", \"output\": \"" << escape(Output.getFilename()) << "\"";
+  CDB << ", \"arguments\": [\"" << escape(D.ClangExecutable) << "\"";
+  SmallString<128> Buf;
+  Buf = "-x";
+  Buf += types::getTypeName(Input.getType());
+  CDB << ", \"" << escape(Buf) << "\"";
+  if (!D.SysRoot.empty() && !Args.hasArg(options::OPT__sysroot_EQ)) {
+    Buf = "--sysroot=";
+    Buf += D.SysRoot;
+    CDB << ", \"" << escape(Buf) << "\"";
+  }
+  CDB << ", \"" << escape(Input.getFilename()) << "\"";
+  CDB << ", \"-o\", \"" << escape(Output.getFilename()) << "\"";
+  for (auto &A: Args) {
+    auto &O = A->getOption();
+    // Skip language selection, which is positional.
+    if (O.getID() == options::OPT_x)
+      continue;
+    // Skip writing dependency output and the compilation database itself.
+    if (O.getGroup().isValid() && O.getGroup().getID() == options::OPT_M_Group)
+      continue;
+    if (O.getID() == options::OPT_gen_cdb_fragment_path)
+      continue;
+    // Skip inputs.
+    if (O.getKind() == Option::InputClass)
+      continue;
+    // Skip output.
+    if (O.getID() == options::OPT_o)
+      continue;
+    // All other arguments are quoted and appended.
+    ArgStringList ASL;
+    A->render(Args, ASL);
+    for (auto &it: ASL)
+      CDB << ", \"" << escape(it) << "\"";
+  }
+  Buf = "--target=";
+  Buf += Target;
+  CDB << ", \"" << escape(Buf) << "\"]},\n";
+}
+
+void Clang::DumpCompilationDatabaseFragmentToDir(
+    StringRef Dir, Compilation &C, StringRef Target, const InputInfo &Output,
+    const InputInfo &Input, const llvm::opt::ArgList &Args) const {
+  // If this is a dry run, do not create the compilation database file.
+  if (C.getArgs().hasArg(options::OPT__HASH_HASH_HASH))
+    return;
+
+  if (CompilationDatabase)
+    DumpCompilationDatabase(C, "", Target, Output, Input, Args);
+
+  SmallString<256> Path = Dir;
+  const auto &Driver = C.getDriver();
+  Driver.getVFS().makeAbsolute(Path);
+  auto Err = llvm::sys::fs::create_directory(Path, /*IgnoreExisting=*/true);
+  if (Err) {
+    Driver.Diag(diag::err_drv_compilationdatabase) << Dir << Err.message();
+    return;
+  }
+
+  llvm::sys::path::append(
+      Path,
+      Twine(llvm::sys::path::filename(Input.getFilename())) + ".%%%%.json");
+  int FD;
+  SmallString<256> TempPath;
+  Err = llvm::sys::fs::createUniqueFile(Path, FD, TempPath,
+                                        llvm::sys::fs::OF_Text);
+  if (Err) {
+    Driver.Diag(diag::err_drv_compilationdatabase) << Path << Err.message();
+    return;
+  }
+  CompilationDatabase =
+      std::make_unique<llvm::raw_fd_ostream>(FD, /*shouldClose=*/true);
+  DumpCompilationDatabase(C, "", Target, Output, Input, Args);
+}
+
+static bool CheckARMImplicitITArg(StringRef Value) {
+  return Value == "always" || Value == "never" || Value == "arm" ||
+         Value == "thumb";
+}
+
+static void AddARMImplicitITArgs(const ArgList &Args, ArgStringList &CmdArgs,
+                                 StringRef Value) {
+  CmdArgs.push_back("-mllvm");
+  CmdArgs.push_back(Args.MakeArgString("-arm-implicit-it=" + Value));
+}
+
+static void CollectArgsForIntegratedAssembler(Compilation &C,
+                                              const ArgList &Args,
+                                              ArgStringList &CmdArgs,
+                                              const Driver &D) {
+  if (UseRelaxAll(C, Args))
+    CmdArgs.push_back("-mrelax-all");
+
+  // Only default to -mincremental-linker-compatible if we think we are
+  // targeting the MSVC linker.
+  bool DefaultIncrementalLinkerCompatible =
+      C.getDefaultToolChain().getTriple().isWindowsMSVCEnvironment();
+  if (Args.hasFlag(options::OPT_mincremental_linker_compatible,
+                   options::OPT_mno_incremental_linker_compatible,
+                   DefaultIncrementalLinkerCompatible))
+    CmdArgs.push_back("-mincremental-linker-compatible");
+
+  Args.AddLastArg(CmdArgs, options::OPT_femit_dwarf_unwind_EQ);
+
+  // If you add more args here, also add them to the block below that
+  // starts with "// If CollectArgsForIntegratedAssembler() isn't called below".
+
+  // When passing -I arguments to the assembler we sometimes need to
+  // unconditionally take the next argument.  For example, when parsing
+  // '-Wa,-I -Wa,foo' we need to accept the -Wa,foo arg after seeing the
+  // -Wa,-I arg and when parsing '-Wa,-I,foo' we need to accept the 'foo'
+  // arg after parsing the '-I' arg.
+  bool TakeNextArg = false;
+
+  bool UseRelaxRelocations = C.getDefaultToolChain().useRelaxRelocations();
+  bool UseNoExecStack = false;
+  const char *MipsTargetFeature = nullptr;
+  StringRef ImplicitIt;
+  for (const Arg *A :
+       Args.filtered(options::OPT_Wa_COMMA, options::OPT_Xassembler,
+                     options::OPT_mimplicit_it_EQ)) {
+    A->claim();
+
+    if (A->getOption().getID() == options::OPT_mimplicit_it_EQ) {
+      switch (C.getDefaultToolChain().getArch()) {
+      case llvm::Triple::arm:
+      case llvm::Triple::armeb:
+      case llvm::Triple::thumb:
+      case llvm::Triple::thumbeb:
+        // Only store the value; the last value set takes effect.
+        ImplicitIt = A->getValue();
+        if (!CheckARMImplicitITArg(ImplicitIt))
+          D.Diag(diag::err_drv_unsupported_option_argument)
+              << A->getSpelling() << ImplicitIt;
+        continue;
+      default:
+        break;
+      }
+    }
+
+    for (StringRef Value : A->getValues()) {
+      if (TakeNextArg) {
+        CmdArgs.push_back(Value.data());
+        TakeNextArg = false;
+        continue;
+      }
+
+      if (C.getDefaultToolChain().getTriple().isOSBinFormatCOFF() &&
+          Value == "-mbig-obj")
+        continue; // LLVM handles bigobj automatically
+
+      switch (C.getDefaultToolChain().getArch()) {
+      default:
+        break;
+      case llvm::Triple::wasm32:
+      case llvm::Triple::wasm64:
+        if (Value == "--no-type-check") {
+          CmdArgs.push_back("-mno-type-check");
+          continue;
+        }
+        break;
+      case llvm::Triple::thumb:
+      case llvm::Triple::thumbeb:
+      case llvm::Triple::arm:
+      case llvm::Triple::armeb:
+        if (Value.startswith("-mimplicit-it=")) {
+          // Only store the value; the last value set takes effect.
+          ImplicitIt = Value.split("=").second;
+          if (CheckARMImplicitITArg(ImplicitIt))
+            continue;
+        }
+        if (Value == "-mthumb")
+          // -mthumb has already been processed in ComputeLLVMTriple()
+          // recognize but skip over here.
+          continue;
+        break;
+      case llvm::Triple::mips:
+      case llvm::Triple::mipsel:
+      case llvm::Triple::mips64:
+      case llvm::Triple::mips64el:
+        if (Value == "--trap") {
+          CmdArgs.push_back("-target-feature");
+          CmdArgs.push_back("+use-tcc-in-div");
+          continue;
+        }
+        if (Value == "--break") {
+          CmdArgs.push_back("-target-feature");
+          CmdArgs.push_back("-use-tcc-in-div");
+          continue;
+        }
+        if (Value.startswith("-msoft-float")) {
+          CmdArgs.push_back("-target-feature");
+          CmdArgs.push_back("+soft-float");
+          continue;
+        }
+        if (Value.startswith("-mhard-float")) {
+          CmdArgs.push_back("-target-feature");
+          CmdArgs.push_back("-soft-float");
+          continue;
+        }
+
+        MipsTargetFeature = llvm::StringSwitch<const char *>(Value)
+                                .Case("-mips1", "+mips1")
+                                .Case("-mips2", "+mips2")
+                                .Case("-mips3", "+mips3")
+                                .Case("-mips4", "+mips4")
+                                .Case("-mips5", "+mips5")
+                                .Case("-mips32", "+mips32")
+                                .Case("-mips32r2", "+mips32r2")
+                                .Case("-mips32r3", "+mips32r3")
+                                .Case("-mips32r5", "+mips32r5")
+                                .Case("-mips32r6", "+mips32r6")
+                                .Case("-mips64", "+mips64")
+                                .Case("-mips64r2", "+mips64r2")
+                                .Case("-mips64r3", "+mips64r3")
+                                .Case("-mips64r5", "+mips64r5")
+                                .Case("-mips64r6", "+mips64r6")
+                                .Default(nullptr);
+        if (MipsTargetFeature)
+          continue;
+      }
+
+      if (Value == "-force_cpusubtype_ALL") {
+        // Do nothing, this is the default and we don't support anything else.
+      } else if (Value == "-L") {
+        CmdArgs.push_back("-msave-temp-labels");
+      } else if (Value == "--fatal-warnings") {
+        CmdArgs.push_back("-massembler-fatal-warnings");
+      } else if (Value == "--no-warn" || Value == "-W") {
+        CmdArgs.push_back("-massembler-no-warn");
+      } else if (Value == "--noexecstack") {
+        UseNoExecStack = true;
+      } else if (Value.startswith("-compress-debug-sections") ||
+                 Value.startswith("--compress-debug-sections") ||
+                 Value == "-nocompress-debug-sections" ||
+                 Value == "--nocompress-debug-sections") {
+        CmdArgs.push_back(Value.data());
+      } else if (Value == "-mrelax-relocations=yes" ||
+                 Value == "--mrelax-relocations=yes") {
+        UseRelaxRelocations = true;
+      } else if (Value == "-mrelax-relocations=no" ||
+                 Value == "--mrelax-relocations=no") {
+        UseRelaxRelocations = false;
+      } else if (Value.startswith("-I")) {
+        CmdArgs.push_back(Value.data());
+        // We need to consume the next argument if the current arg is a plain
+        // -I. The next arg will be the include directory.
+        if (Value == "-I")
+          TakeNextArg = true;
+      } else if (Value.startswith("-gdwarf-")) {
+        // "-gdwarf-N" options are not cc1as options.
+        unsigned DwarfVersion = DwarfVersionNum(Value);
+        if (DwarfVersion == 0) { // Send it onward, and let cc1as complain.
+          CmdArgs.push_back(Value.data());
+        } else {
+          RenderDebugEnablingArgs(Args, CmdArgs,
+                                  codegenoptions::DebugInfoConstructor,
+                                  DwarfVersion, llvm::DebuggerKind::Default);
+        }
+      } else if (Value.startswith("-mcpu") || Value.startswith("-mfpu") ||
+                 Value.startswith("-mhwdiv") || Value.startswith("-march")) {
+        // Do nothing, we'll validate it later.
+      } else if (Value == "-defsym") {
+          if (A->getNumValues() != 2) {
+            D.Diag(diag::err_drv_defsym_invalid_format) << Value;
+            break;
+          }
+          const char *S = A->getValue(1);
+          auto Pair = StringRef(S).split('=');
+          auto Sym = Pair.first;
+          auto SVal = Pair.second;
+
+          if (Sym.empty() || SVal.empty()) {
+            D.Diag(diag::err_drv_defsym_invalid_format) << S;
+            break;
+          }
+          int64_t IVal;
+          if (SVal.getAsInteger(0, IVal)) {
+            D.Diag(diag::err_drv_defsym_invalid_symval) << SVal;
+            break;
+          }
+          CmdArgs.push_back(Value.data());
+          TakeNextArg = true;
+      } else if (Value == "-fdebug-compilation-dir") {
+        CmdArgs.push_back("-fdebug-compilation-dir");
+        TakeNextArg = true;
+      } else if (Value.consume_front("-fdebug-compilation-dir=")) {
+        // The flag is a -Wa / -Xassembler argument and Options doesn't
+        // parse the argument, so this isn't automatically aliased to
+        // -fdebug-compilation-dir (without '=') here.
+        CmdArgs.push_back("-fdebug-compilation-dir");
+        CmdArgs.push_back(Value.data());
+      } else if (Value == "--version") {
+        D.PrintVersion(C, llvm::outs());
+      } else {
+        D.Diag(diag::err_drv_unsupported_option_argument)
+            << A->getSpelling() << Value;
+      }
+    }
+  }
+  if (ImplicitIt.size())
+    AddARMImplicitITArgs(Args, CmdArgs, ImplicitIt);
+  if (!UseRelaxRelocations)
+    CmdArgs.push_back("-mrelax-relocations=no");
+  if (UseNoExecStack)
+    CmdArgs.push_back("-mnoexecstack");
+  if (MipsTargetFeature != nullptr) {
+    CmdArgs.push_back("-target-feature");
+    CmdArgs.push_back(MipsTargetFeature);
+  }
+
+  // forward -fembed-bitcode to assmebler
+  if (C.getDriver().embedBitcodeEnabled() ||
+      C.getDriver().embedBitcodeMarkerOnly())
+    Args.AddLastArg(CmdArgs, options::OPT_fembed_bitcode_EQ);
+
+  if (const char *AsSecureLogFile = getenv("AS_SECURE_LOG_FILE")) {
+    CmdArgs.push_back("-as-secure-log-file");
+    CmdArgs.push_back(Args.MakeArgString(AsSecureLogFile));
+  }
+}
+
+static void RenderFloatingPointOptions(const ToolChain &TC, const Driver &D,
+                                       bool OFastEnabled, const ArgList &Args,
+                                       ArgStringList &CmdArgs,
+                                       const JobAction &JA) {
+  // Handle various floating point optimization flags, mapping them to the
+  // appropriate LLVM code generation flags. This is complicated by several
+  // "umbrella" flags, so we do this by stepping through the flags incrementally
+  // adjusting what we think is enabled/disabled, then at the end setting the
+  // LLVM flags based on the final state.
+  bool HonorINFs = true;
+  bool HonorNaNs = true;
+  bool ApproxFunc = false;
+  // -fmath-errno is the default on some platforms, e.g. BSD-derived OSes.
+  bool MathErrno = TC.IsMathErrnoDefault();
+  bool AssociativeMath = false;
+  bool ReciprocalMath = false;
+  bool SignedZeros = true;
+  bool TrappingMath = false; // Implemented via -ffp-exception-behavior
+  bool TrappingMathPresent = false; // Is trapping-math in args, and not
+                                    // overriden by ffp-exception-behavior?
+  bool RoundingFPMath = false;
+  bool RoundingMathPresent = false; // Is rounding-math in args?
+  // -ffp-model values: strict, fast, precise
+  StringRef FPModel = "";
+  // -ffp-exception-behavior options: strict, maytrap, ignore
+  StringRef FPExceptionBehavior = "";
+  // -ffp-eval-method options: double, extended, source
+  StringRef FPEvalMethod = "";
+  const llvm::DenormalMode DefaultDenormalFPMath =
+      TC.getDefaultDenormalModeForType(Args, JA);
+  const llvm::DenormalMode DefaultDenormalFP32Math =
+      TC.getDefaultDenormalModeForType(Args, JA, &llvm::APFloat::IEEEsingle());
+
+  llvm::DenormalMode DenormalFPMath = DefaultDenormalFPMath;
+  llvm::DenormalMode DenormalFP32Math = DefaultDenormalFP32Math;
+  // CUDA and HIP don't rely on the frontend to pass an ffp-contract option.
+  // If one wasn't given by the user, don't pass it here.
+  StringRef FPContract;
+  StringRef LastSeenFfpContractOption;
+  bool SeenUnsafeMathModeOption = false;
+  if (!JA.isDeviceOffloading(Action::OFK_Cuda) &&
+      !JA.isOffloading(Action::OFK_HIP))
+    FPContract = "on";
+  bool StrictFPModel = false;
+  StringRef Float16ExcessPrecision = "";
+
+  if (const Arg *A = Args.getLastArg(options::OPT_flimited_precision_EQ)) {
+    CmdArgs.push_back("-mlimit-float-precision");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  for (const Arg *A : Args) {
+    auto optID = A->getOption().getID();
+    bool PreciseFPModel = false;
+    switch (optID) {
+    default:
+      break;
+    case options::OPT_ffp_model_EQ: {
+      // If -ffp-model= is seen, reset to fno-fast-math
+      HonorINFs = true;
+      HonorNaNs = true;
+      ApproxFunc = false;
+      // Turning *off* -ffast-math restores the toolchain default.
+      MathErrno = TC.IsMathErrnoDefault();
+      AssociativeMath = false;
+      ReciprocalMath = false;
+      SignedZeros = true;
+      // -fno_fast_math restores default denormal and fpcontract handling
+      FPContract = "on";
+      DenormalFPMath = llvm::DenormalMode::getIEEE();
+
+      // FIXME: The target may have picked a non-IEEE default mode here based on
+      // -cl-denorms-are-zero. Should the target consider -fp-model interaction?
+      DenormalFP32Math = llvm::DenormalMode::getIEEE();
+
+      StringRef Val = A->getValue();
+      if (OFastEnabled && !Val.equals("fast")) {
+          // Only -ffp-model=fast is compatible with OFast, ignore.
+        D.Diag(clang::diag::warn_drv_overriding_flag_option)
+          << Args.MakeArgString("-ffp-model=" + Val)
+          << "-Ofast";
+        break;
+      }
+      StrictFPModel = false;
+      PreciseFPModel = true;
+      // ffp-model= is a Driver option, it is entirely rewritten into more
+      // granular options before being passed into cc1.
+      // Use the gcc option in the switch below.
+      if (!FPModel.empty() && !FPModel.equals(Val))
+        D.Diag(clang::diag::warn_drv_overriding_flag_option)
+            << Args.MakeArgString("-ffp-model=" + FPModel)
+            << Args.MakeArgString("-ffp-model=" + Val);
+      if (Val.equals("fast")) {
+        optID = options::OPT_ffast_math;
+        FPModel = Val;
+        FPContract = "fast";
+      } else if (Val.equals("precise")) {
+        optID = options::OPT_ffp_contract;
+        FPModel = Val;
+        FPContract = "on";
+        PreciseFPModel = true;
+      } else if (Val.equals("strict")) {
+        StrictFPModel = true;
+        optID = options::OPT_frounding_math;
+        FPExceptionBehavior = "strict";
+        FPModel = Val;
+        FPContract = "off";
+        TrappingMath = true;
+      } else
+        D.Diag(diag::err_drv_unsupported_option_argument)
+            << A->getSpelling() << Val;
+      break;
+      }
+    }
+
+    switch (optID) {
+    // If this isn't an FP option skip the claim below
+    default: continue;
+
+    // Options controlling individual features
+    case options::OPT_fhonor_infinities:    HonorINFs = true;         break;
+    case options::OPT_fno_honor_infinities: HonorINFs = false;        break;
+    case options::OPT_fhonor_nans:          HonorNaNs = true;         break;
+    case options::OPT_fno_honor_nans:       HonorNaNs = false;        break;
+    case options::OPT_fapprox_func:         ApproxFunc = true;        break;
+    case options::OPT_fno_approx_func:      ApproxFunc = false;       break;
+    case options::OPT_fmath_errno:          MathErrno = true;         break;
+    case options::OPT_fno_math_errno:       MathErrno = false;        break;
+    case options::OPT_fassociative_math:    AssociativeMath = true;   break;
+    case options::OPT_fno_associative_math: AssociativeMath = false;  break;
+    case options::OPT_freciprocal_math:     ReciprocalMath = true;    break;
+    case options::OPT_fno_reciprocal_math:  ReciprocalMath = false;   break;
+    case options::OPT_fsigned_zeros:        SignedZeros = true;       break;
+    case options::OPT_fno_signed_zeros:     SignedZeros = false;      break;
+    case options::OPT_ftrapping_math:
+      if (!TrappingMathPresent && !FPExceptionBehavior.empty() &&
+          !FPExceptionBehavior.equals("strict"))
+        // Warn that previous value of option is overridden.
+        D.Diag(clang::diag::warn_drv_overriding_flag_option)
+          << Args.MakeArgString("-ffp-exception-behavior=" + FPExceptionBehavior)
+          << "-ftrapping-math";
+      TrappingMath = true;
+      TrappingMathPresent = true;
+      FPExceptionBehavior = "strict";
+      break;
+    case options::OPT_fno_trapping_math:
+      if (!TrappingMathPresent && !FPExceptionBehavior.empty() &&
+          !FPExceptionBehavior.equals("ignore"))
+        // Warn that previous value of option is overridden.
+        D.Diag(clang::diag::warn_drv_overriding_flag_option)
+          << Args.MakeArgString("-ffp-exception-behavior=" + FPExceptionBehavior)
+          << "-fno-trapping-math";
+      TrappingMath = false;
+      TrappingMathPresent = true;
+      FPExceptionBehavior = "ignore";
+      break;
+
+    case options::OPT_frounding_math:
+      RoundingFPMath = true;
+      RoundingMathPresent = true;
+      break;
+
+    case options::OPT_fno_rounding_math:
+      RoundingFPMath = false;
+      RoundingMathPresent = false;
+      break;
+
+    case options::OPT_fdenormal_fp_math_EQ:
+      DenormalFPMath = llvm::parseDenormalFPAttribute(A->getValue());
+      DenormalFP32Math = DenormalFPMath;
+      if (!DenormalFPMath.isValid()) {
+        D.Diag(diag::err_drv_invalid_value)
+            << A->getAsString(Args) << A->getValue();
+      }
+      break;
+
+    case options::OPT_fdenormal_fp_math_f32_EQ:
+      DenormalFP32Math = llvm::parseDenormalFPAttribute(A->getValue());
+      if (!DenormalFP32Math.isValid()) {
+        D.Diag(diag::err_drv_invalid_value)
+            << A->getAsString(Args) << A->getValue();
+      }
+      break;
+
+    // Validate and pass through -ffp-contract option.
+    case options::OPT_ffp_contract: {
+      StringRef Val = A->getValue();
+      if (PreciseFPModel) {
+        // -ffp-model=precise enables ffp-contract=on.
+        // -ffp-model=precise sets PreciseFPModel to on and Val to
+        // "precise". FPContract is set.
+        ;
+      } else if (Val.equals("fast") || Val.equals("on") || Val.equals("off")) {
+        FPContract = Val;
+        LastSeenFfpContractOption = Val;
+      } else
+        D.Diag(diag::err_drv_unsupported_option_argument)
+            << A->getSpelling() << Val;
+      break;
+    }
+
+    // Validate and pass through -ffp-model option.
+    case options::OPT_ffp_model_EQ:
+      // This should only occur in the error case
+      // since the optID has been replaced by a more granular
+      // floating point option.
+      break;
+
+    // Validate and pass through -ffp-exception-behavior option.
+    case options::OPT_ffp_exception_behavior_EQ: {
+      StringRef Val = A->getValue();
+      if (!TrappingMathPresent && !FPExceptionBehavior.empty() &&
+          !FPExceptionBehavior.equals(Val))
+        // Warn that previous value of option is overridden.
+        D.Diag(clang::diag::warn_drv_overriding_flag_option)
+          << Args.MakeArgString("-ffp-exception-behavior=" + FPExceptionBehavior)
+          << Args.MakeArgString("-ffp-exception-behavior=" + Val);
+      TrappingMath = TrappingMathPresent = false;
+      if (Val.equals("ignore") || Val.equals("maytrap"))
+        FPExceptionBehavior = Val;
+      else if (Val.equals("strict")) {
+        FPExceptionBehavior = Val;
+        TrappingMath = TrappingMathPresent = true;
+      } else
+        D.Diag(diag::err_drv_unsupported_option_argument)
+            << A->getSpelling() << Val;
+      break;
+    }
+
+    // Validate and pass through -ffp-eval-method option.
+    case options::OPT_ffp_eval_method_EQ: {
+      StringRef Val = A->getValue();
+      if (Val.equals("double") || Val.equals("extended") ||
+          Val.equals("source"))
+        FPEvalMethod = Val;
+      else
+        D.Diag(diag::err_drv_unsupported_option_argument)
+            << A->getSpelling() << Val;
+      break;
+    }
+
+    case options::OPT_fexcess_precision_EQ: {
+      StringRef Val = A->getValue();
+      const llvm::Triple::ArchType Arch = TC.getArch();
+      if (Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64) {
+        if (Val.equals("standard") || Val.equals("fast"))
+          Float16ExcessPrecision = Val;
+        // To make it GCC compatible, allow the value of "16" which
+        // means disable excess precision, the same meaning than clang's
+        // equivalent value "none".
+        else if (Val.equals("16"))
+          Float16ExcessPrecision = "none";
+        else
+          D.Diag(diag::err_drv_unsupported_option_argument)
+              << A->getSpelling() << Val;
+      } else {
+        if (!(Val.equals("standard") || Val.equals("fast")))
+          D.Diag(diag::err_drv_unsupported_option_argument)
+              << A->getSpelling() << Val;
+      }
+      break;
+    }
+    case options::OPT_ffinite_math_only:
+      HonorINFs = false;
+      HonorNaNs = false;
+      break;
+    case options::OPT_fno_finite_math_only:
+      HonorINFs = true;
+      HonorNaNs = true;
+      break;
+
+    case options::OPT_funsafe_math_optimizations:
+      AssociativeMath = true;
+      ReciprocalMath = true;
+      SignedZeros = false;
+      ApproxFunc = true;
+      TrappingMath = false;
+      FPExceptionBehavior = "";
+      FPContract = "fast";
+      SeenUnsafeMathModeOption = true;
+      break;
+    case options::OPT_fno_unsafe_math_optimizations:
+      AssociativeMath = false;
+      ReciprocalMath = false;
+      SignedZeros = true;
+      ApproxFunc = false;
+      TrappingMath = true;
+      FPExceptionBehavior = "strict";
+
+      // The target may have opted to flush by default, so force IEEE.
+      DenormalFPMath = llvm::DenormalMode::getIEEE();
+      DenormalFP32Math = llvm::DenormalMode::getIEEE();
+      if (!JA.isDeviceOffloading(Action::OFK_Cuda) &&
+          !JA.isOffloading(Action::OFK_HIP)) {
+        if (LastSeenFfpContractOption != "") {
+          FPContract = LastSeenFfpContractOption;
+        } else if (SeenUnsafeMathModeOption)
+          FPContract = "on";
+      }
+      break;
+
+    case options::OPT_Ofast:
+      // If -Ofast is the optimization level, then -ffast-math should be enabled
+      if (!OFastEnabled)
+        continue;
+      [[fallthrough]];
+    case options::OPT_ffast_math:
+      HonorINFs = false;
+      HonorNaNs = false;
+      MathErrno = false;
+      AssociativeMath = true;
+      ReciprocalMath = true;
+      ApproxFunc = true;
+      SignedZeros = false;
+      TrappingMath = false;
+      RoundingFPMath = false;
+      FPExceptionBehavior = "";
+      // If fast-math is set then set the fp-contract mode to fast.
+      FPContract = "fast";
+      SeenUnsafeMathModeOption = true;
+      break;
+    case options::OPT_fno_fast_math:
+      HonorINFs = true;
+      HonorNaNs = true;
+      // Turning on -ffast-math (with either flag) removes the need for
+      // MathErrno. However, turning *off* -ffast-math merely restores the
+      // toolchain default (which may be false).
+      MathErrno = TC.IsMathErrnoDefault();
+      AssociativeMath = false;
+      ReciprocalMath = false;
+      ApproxFunc = false;
+      SignedZeros = true;
+      // -fno_fast_math restores default denormal and fpcontract handling
+      DenormalFPMath = DefaultDenormalFPMath;
+      DenormalFP32Math = llvm::DenormalMode::getIEEE();
+      if (!JA.isDeviceOffloading(Action::OFK_Cuda) &&
+          !JA.isOffloading(Action::OFK_HIP)) {
+        if (LastSeenFfpContractOption != "") {
+          FPContract = LastSeenFfpContractOption;
+        } else if (SeenUnsafeMathModeOption)
+          FPContract = "on";
+      }
+      break;
+    }
+    if (StrictFPModel) {
+      // If -ffp-model=strict has been specified on command line but
+      // subsequent options conflict then emit warning diagnostic.
+      if (HonorINFs && HonorNaNs && !AssociativeMath && !ReciprocalMath &&
+          SignedZeros && TrappingMath && RoundingFPMath && !ApproxFunc &&
+          DenormalFPMath == llvm::DenormalMode::getIEEE() &&
+          DenormalFP32Math == llvm::DenormalMode::getIEEE() &&
+          FPContract.equals("off"))
+        // OK: Current Arg doesn't conflict with -ffp-model=strict
+        ;
+      else {
+        StrictFPModel = false;
+        FPModel = "";
+        auto RHS = (A->getNumValues() == 0)
+                       ? A->getSpelling()
+                       : Args.MakeArgString(A->getSpelling() + A->getValue());
+        if (RHS != "-ffp-model=strict")
+          D.Diag(clang::diag::warn_drv_overriding_flag_option)
+              << "-ffp-model=strict" << RHS;
+      }
+    }
+
+    // If we handled this option claim it
+    A->claim();
+  }
+
+  if (!HonorINFs)
+    CmdArgs.push_back("-menable-no-infs");
+
+  if (!HonorNaNs)
+    CmdArgs.push_back("-menable-no-nans");
+
+  if (ApproxFunc)
+    CmdArgs.push_back("-fapprox-func");
+
+  if (MathErrno)
+    CmdArgs.push_back("-fmath-errno");
+
+ if (AssociativeMath && ReciprocalMath && !SignedZeros && ApproxFunc &&
+     !TrappingMath)
+    CmdArgs.push_back("-funsafe-math-optimizations");
+
+  if (!SignedZeros)
+    CmdArgs.push_back("-fno-signed-zeros");
+
+  if (AssociativeMath && !SignedZeros && !TrappingMath)
+    CmdArgs.push_back("-mreassociate");
+
+  if (ReciprocalMath)
+    CmdArgs.push_back("-freciprocal-math");
+
+  if (TrappingMath) {
+    // FP Exception Behavior is also set to strict
+    assert(FPExceptionBehavior.equals("strict"));
+  }
+
+  // The default is IEEE.
+  if (DenormalFPMath != llvm::DenormalMode::getIEEE()) {
+    llvm::SmallString<64> DenormFlag;
+    llvm::raw_svector_ostream ArgStr(DenormFlag);
+    ArgStr << "-fdenormal-fp-math=" << DenormalFPMath;
+    CmdArgs.push_back(Args.MakeArgString(ArgStr.str()));
+  }
+
+  // Add f32 specific denormal mode flag if it's different.
+  if (DenormalFP32Math != DenormalFPMath) {
+    llvm::SmallString<64> DenormFlag;
+    llvm::raw_svector_ostream ArgStr(DenormFlag);
+    ArgStr << "-fdenormal-fp-math-f32=" << DenormalFP32Math;
+    CmdArgs.push_back(Args.MakeArgString(ArgStr.str()));
+  }
+
+  if (!FPContract.empty())
+    CmdArgs.push_back(Args.MakeArgString("-ffp-contract=" + FPContract));
+
+  if (!RoundingFPMath)
+    CmdArgs.push_back(Args.MakeArgString("-fno-rounding-math"));
+
+  if (RoundingFPMath && RoundingMathPresent)
+    CmdArgs.push_back(Args.MakeArgString("-frounding-math"));
+
+  if (!FPExceptionBehavior.empty())
+    CmdArgs.push_back(Args.MakeArgString("-ffp-exception-behavior=" +
+                      FPExceptionBehavior));
+
+  if (!FPEvalMethod.empty())
+    CmdArgs.push_back(Args.MakeArgString("-ffp-eval-method=" + FPEvalMethod));
+
+  if (!Float16ExcessPrecision.empty())
+    CmdArgs.push_back(Args.MakeArgString("-ffloat16-excess-precision=" +
+                                         Float16ExcessPrecision));
+
+  ParseMRecip(D, Args, CmdArgs);
+
+  // -ffast-math enables the __FAST_MATH__ preprocessor macro, but check for the
+  // individual features enabled by -ffast-math instead of the option itself as
+  // that's consistent with gcc's behaviour.
+  if (!HonorINFs && !HonorNaNs && !MathErrno && AssociativeMath && ApproxFunc &&
+      ReciprocalMath && !SignedZeros && !TrappingMath && !RoundingFPMath) {
+    CmdArgs.push_back("-ffast-math");
+    if (FPModel.equals("fast")) {
+      if (FPContract.equals("fast"))
+        // All set, do nothing.
+        ;
+      else if (FPContract.empty())
+        // Enable -ffp-contract=fast
+        CmdArgs.push_back(Args.MakeArgString("-ffp-contract=fast"));
+      else
+        D.Diag(clang::diag::warn_drv_overriding_flag_option)
+          << "-ffp-model=fast"
+          << Args.MakeArgString("-ffp-contract=" + FPContract);
+    }
+  }
+
+  // Handle __FINITE_MATH_ONLY__ similarly.
+  if (!HonorINFs && !HonorNaNs)
+    CmdArgs.push_back("-ffinite-math-only");
+
+  if (const Arg *A = Args.getLastArg(options::OPT_mfpmath_EQ)) {
+    CmdArgs.push_back("-mfpmath");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  // Disable a codegen optimization for floating-point casts.
+  if (Args.hasFlag(options::OPT_fno_strict_float_cast_overflow,
+                   options::OPT_fstrict_float_cast_overflow, false))
+    CmdArgs.push_back("-fno-strict-float-cast-overflow");
+}
+
+static void RenderAnalyzerOptions(const ArgList &Args, ArgStringList &CmdArgs,
+                                  const llvm::Triple &Triple,
+                                  const InputInfo &Input) {
+  // Add default argument set.
+  if (!Args.hasArg(options::OPT__analyzer_no_default_checks)) {
+    CmdArgs.push_back("-analyzer-checker=core");
+    CmdArgs.push_back("-analyzer-checker=apiModeling");
+
+    if (!Triple.isWindowsMSVCEnvironment()) {
+      CmdArgs.push_back("-analyzer-checker=unix");
+    } else {
+      // Enable "unix" checkers that also work on Windows.
+      CmdArgs.push_back("-analyzer-checker=unix.API");
+      CmdArgs.push_back("-analyzer-checker=unix.Malloc");
+      CmdArgs.push_back("-analyzer-checker=unix.MallocSizeof");
+      CmdArgs.push_back("-analyzer-checker=unix.MismatchedDeallocator");
+      CmdArgs.push_back("-analyzer-checker=unix.cstring.BadSizeArg");
+      CmdArgs.push_back("-analyzer-checker=unix.cstring.NullArg");
+    }
+
+    // Disable some unix checkers for PS4/PS5.
+    if (Triple.isPS()) {
+      CmdArgs.push_back("-analyzer-disable-checker=unix.API");
+      CmdArgs.push_back("-analyzer-disable-checker=unix.Vfork");
+    }
+
+    if (Triple.isOSDarwin()) {
+      CmdArgs.push_back("-analyzer-checker=osx");
+      CmdArgs.push_back(
+          "-analyzer-checker=security.insecureAPI.decodeValueOfObjCType");
+    }
+    else if (Triple.isOSFuchsia())
+      CmdArgs.push_back("-analyzer-checker=fuchsia");
+
+    CmdArgs.push_back("-analyzer-checker=deadcode");
+
+    if (types::isCXX(Input.getType()))
+      CmdArgs.push_back("-analyzer-checker=cplusplus");
+
+    if (!Triple.isPS()) {
+      CmdArgs.push_back("-analyzer-checker=security.insecureAPI.UncheckedReturn");
+      CmdArgs.push_back("-analyzer-checker=security.insecureAPI.getpw");
+      CmdArgs.push_back("-analyzer-checker=security.insecureAPI.gets");
+      CmdArgs.push_back("-analyzer-checker=security.insecureAPI.mktemp");
+      CmdArgs.push_back("-analyzer-checker=security.insecureAPI.mkstemp");
+      CmdArgs.push_back("-analyzer-checker=security.insecureAPI.vfork");
+    }
+
+    // Default nullability checks.
+    CmdArgs.push_back("-analyzer-checker=nullability.NullPassedToNonnull");
+    CmdArgs.push_back("-analyzer-checker=nullability.NullReturnedFromNonnull");
+  }
+
+  // Set the output format. The default is plist, for (lame) historical reasons.
+  CmdArgs.push_back("-analyzer-output");
+  if (Arg *A = Args.getLastArg(options::OPT__analyzer_output))
+    CmdArgs.push_back(A->getValue());
+  else
+    CmdArgs.push_back("plist");
+
+  // Disable the presentation of standard compiler warnings when using
+  // --analyze.  We only want to show static analyzer diagnostics or frontend
+  // errors.
+  CmdArgs.push_back("-w");
+
+  // Add -Xanalyzer arguments when running as analyzer.
+  Args.AddAllArgValues(CmdArgs, options::OPT_Xanalyzer);
+}
+
+static bool isValidSymbolName(StringRef S) {
+  if (S.empty())
+    return false;
+
+  if (std::isdigit(S[0]))
+    return false;
+
+  return llvm::all_of(S, [](char C) { return std::isalnum(C) || C == '_'; });
+}
+
+static void RenderSSPOptions(const Driver &D, const ToolChain &TC,
+                             const ArgList &Args, ArgStringList &CmdArgs,
+                             bool KernelOrKext) {
+  const llvm::Triple &EffectiveTriple = TC.getEffectiveTriple();
+
+  // NVPTX doesn't support stack protectors; from the compiler's perspective, it
+  // doesn't even have a stack!
+  if (EffectiveTriple.isNVPTX())
+    return;
+
+  // -stack-protector=0 is default.
+  LangOptions::StackProtectorMode StackProtectorLevel = LangOptions::SSPOff;
+  LangOptions::StackProtectorMode DefaultStackProtectorLevel =
+      TC.GetDefaultStackProtectorLevel(KernelOrKext);
+
+  if (Arg *A = Args.getLastArg(options::OPT_fno_stack_protector,
+                               options::OPT_fstack_protector_all,
+                               options::OPT_fstack_protector_strong,
+                               options::OPT_fstack_protector)) {
+    if (A->getOption().matches(options::OPT_fstack_protector))
+      StackProtectorLevel =
+          std::max<>(LangOptions::SSPOn, DefaultStackProtectorLevel);
+    else if (A->getOption().matches(options::OPT_fstack_protector_strong))
+      StackProtectorLevel = LangOptions::SSPStrong;
+    else if (A->getOption().matches(options::OPT_fstack_protector_all))
+      StackProtectorLevel = LangOptions::SSPReq;
+
+    if (EffectiveTriple.isBPF() && StackProtectorLevel != LangOptions::SSPOff) {
+      D.Diag(diag::warn_drv_unsupported_option_for_target)
+          << A->getSpelling() << EffectiveTriple.getTriple();
+      StackProtectorLevel = DefaultStackProtectorLevel;
+    }
+  } else {
+    StackProtectorLevel = DefaultStackProtectorLevel;
+  }
+
+  if (StackProtectorLevel) {
+    CmdArgs.push_back("-stack-protector");
+    CmdArgs.push_back(Args.MakeArgString(Twine(StackProtectorLevel)));
+  }
+
+  // --param ssp-buffer-size=
+  for (const Arg *A : Args.filtered(options::OPT__param)) {
+    StringRef Str(A->getValue());
+    if (Str.startswith("ssp-buffer-size=")) {
+      if (StackProtectorLevel) {
+        CmdArgs.push_back("-stack-protector-buffer-size");
+        // FIXME: Verify the argument is a valid integer.
+        CmdArgs.push_back(Args.MakeArgString(Str.drop_front(16)));
+      }
+      A->claim();
+    }
+  }
+
+  const std::string &TripleStr = EffectiveTriple.getTriple();
+  if (Arg *A = Args.getLastArg(options::OPT_mstack_protector_guard_EQ)) {
+    StringRef Value = A->getValue();
+    if (!EffectiveTriple.isX86() && !EffectiveTriple.isAArch64() &&
+        !EffectiveTriple.isARM() && !EffectiveTriple.isThumb())
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getAsString(Args) << TripleStr;
+    if ((EffectiveTriple.isX86() || EffectiveTriple.isARM() ||
+         EffectiveTriple.isThumb()) &&
+        Value != "tls" && Value != "global") {
+      D.Diag(diag::err_drv_invalid_value_with_suggestion)
+          << A->getOption().getName() << Value << "tls global";
+      return;
+    }
+    if ((EffectiveTriple.isARM() || EffectiveTriple.isThumb()) &&
+        Value == "tls") {
+      if (!Args.hasArg(options::OPT_mstack_protector_guard_offset_EQ)) {
+        D.Diag(diag::err_drv_ssp_missing_offset_argument)
+            << A->getAsString(Args);
+        return;
+      }
+      // Check whether the target subarch supports the hardware TLS register
+      if (!arm::isHardTPSupported(EffectiveTriple)) {
+        D.Diag(diag::err_target_unsupported_tp_hard)
+            << EffectiveTriple.getArchName();
+        return;
+      }
+      // Check whether the user asked for something other than -mtp=cp15
+      if (Arg *A = Args.getLastArg(options::OPT_mtp_mode_EQ)) {
+        StringRef Value = A->getValue();
+        if (Value != "cp15") {
+          D.Diag(diag::err_drv_argument_not_allowed_with)
+              << A->getAsString(Args) << "-mstack-protector-guard=tls";
+          return;
+        }
+      }
+      CmdArgs.push_back("-target-feature");
+      CmdArgs.push_back("+read-tp-hard");
+    }
+    if (EffectiveTriple.isAArch64() && Value != "sysreg" && Value != "global") {
+      D.Diag(diag::err_drv_invalid_value_with_suggestion)
+          << A->getOption().getName() << Value << "sysreg global";
+      return;
+    }
+    A->render(Args, CmdArgs);
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_mstack_protector_guard_offset_EQ)) {
+    StringRef Value = A->getValue();
+    if (!EffectiveTriple.isX86() && !EffectiveTriple.isAArch64() &&
+        !EffectiveTriple.isARM() && !EffectiveTriple.isThumb())
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getAsString(Args) << TripleStr;
+    int Offset;
+    if (Value.getAsInteger(10, Offset)) {
+      D.Diag(diag::err_drv_invalid_value) << A->getOption().getName() << Value;
+      return;
+    }
+    if ((EffectiveTriple.isARM() || EffectiveTriple.isThumb()) &&
+        (Offset < 0 || Offset > 0xfffff)) {
+      D.Diag(diag::err_drv_invalid_int_value)
+          << A->getOption().getName() << Value;
+      return;
+    }
+    A->render(Args, CmdArgs);
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_mstack_protector_guard_reg_EQ)) {
+    StringRef Value = A->getValue();
+    if (!EffectiveTriple.isX86() && !EffectiveTriple.isAArch64())
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getAsString(Args) << TripleStr;
+    if (EffectiveTriple.isX86() && (Value != "fs" && Value != "gs")) {
+      D.Diag(diag::err_drv_invalid_value_with_suggestion)
+          << A->getOption().getName() << Value << "fs gs";
+      return;
+    }
+    if (EffectiveTriple.isAArch64() && Value != "sp_el0") {
+      D.Diag(diag::err_drv_invalid_value) << A->getOption().getName() << Value;
+      return;
+    }
+    A->render(Args, CmdArgs);
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_mstack_protector_guard_symbol_EQ)) {
+    StringRef Value = A->getValue();
+    if (!isValidSymbolName(Value)) {
+      D.Diag(diag::err_drv_argument_only_allowed_with)
+          << A->getOption().getName() << "legal symbol name";
+      return;
+    }
+    A->render(Args, CmdArgs);
+  }
+}
+
+static void RenderSCPOptions(const ToolChain &TC, const ArgList &Args,
+                             ArgStringList &CmdArgs) {
+  const llvm::Triple &EffectiveTriple = TC.getEffectiveTriple();
+
+  if (!EffectiveTriple.isOSFreeBSD() && !EffectiveTriple.isOSLinux())
+    return;
+
+  if (!EffectiveTriple.isX86() && !EffectiveTriple.isSystemZ() &&
+      !EffectiveTriple.isPPC64())
+    return;
+
+  Args.addOptInFlag(CmdArgs, options::OPT_fstack_clash_protection,
+                    options::OPT_fno_stack_clash_protection);
+}
+
+static void RenderTrivialAutoVarInitOptions(const Driver &D,
+                                            const ToolChain &TC,
+                                            const ArgList &Args,
+                                            ArgStringList &CmdArgs) {
+  auto DefaultTrivialAutoVarInit = TC.GetDefaultTrivialAutoVarInit();
+  StringRef TrivialAutoVarInit = "";
+
+  for (const Arg *A : Args) {
+    switch (A->getOption().getID()) {
+    default:
+      continue;
+    case options::OPT_ftrivial_auto_var_init: {
+      A->claim();
+      StringRef Val = A->getValue();
+      if (Val == "uninitialized" || Val == "zero" || Val == "pattern")
+        TrivialAutoVarInit = Val;
+      else
+        D.Diag(diag::err_drv_unsupported_option_argument)
+            << A->getSpelling() << Val;
+      break;
+    }
+    }
+  }
+
+  if (TrivialAutoVarInit.empty())
+    switch (DefaultTrivialAutoVarInit) {
+    case LangOptions::TrivialAutoVarInitKind::Uninitialized:
+      break;
+    case LangOptions::TrivialAutoVarInitKind::Pattern:
+      TrivialAutoVarInit = "pattern";
+      break;
+    case LangOptions::TrivialAutoVarInitKind::Zero:
+      TrivialAutoVarInit = "zero";
+      break;
+    }
+
+  if (!TrivialAutoVarInit.empty()) {
+    CmdArgs.push_back(
+        Args.MakeArgString("-ftrivial-auto-var-init=" + TrivialAutoVarInit));
+  }
+
+  if (Arg *A =
+          Args.getLastArg(options::OPT_ftrivial_auto_var_init_stop_after)) {
+    if (!Args.hasArg(options::OPT_ftrivial_auto_var_init) ||
+        StringRef(
+            Args.getLastArg(options::OPT_ftrivial_auto_var_init)->getValue()) ==
+            "uninitialized")
+      D.Diag(diag::err_drv_trivial_auto_var_init_stop_after_missing_dependency);
+    A->claim();
+    StringRef Val = A->getValue();
+    if (std::stoi(Val.str()) <= 0)
+      D.Diag(diag::err_drv_trivial_auto_var_init_stop_after_invalid_value);
+    CmdArgs.push_back(
+        Args.MakeArgString("-ftrivial-auto-var-init-stop-after=" + Val));
+  }
+}
+
+static void RenderOpenCLOptions(const ArgList &Args, ArgStringList &CmdArgs,
+                                types::ID InputType) {
+  // cl-denorms-are-zero is not forwarded. It is translated into a generic flag
+  // for denormal flushing handling based on the target.
+  const unsigned ForwardedArguments[] = {
+      options::OPT_cl_opt_disable,
+      options::OPT_cl_strict_aliasing,
+      options::OPT_cl_single_precision_constant,
+      options::OPT_cl_finite_math_only,
+      options::OPT_cl_kernel_arg_info,
+      options::OPT_cl_unsafe_math_optimizations,
+      options::OPT_cl_fast_relaxed_math,
+      options::OPT_cl_mad_enable,
+      options::OPT_cl_no_signed_zeros,
+      options::OPT_cl_fp32_correctly_rounded_divide_sqrt,
+      options::OPT_cl_uniform_work_group_size
+  };
+
+  if (Arg *A = Args.getLastArg(options::OPT_cl_std_EQ)) {
+    std::string CLStdStr = std::string("-cl-std=") + A->getValue();
+    CmdArgs.push_back(Args.MakeArgString(CLStdStr));
+  } else if (Arg *A = Args.getLastArg(options::OPT_cl_ext_EQ)) {
+    std::string CLExtStr = std::string("-cl-ext=") + A->getValue();
+    CmdArgs.push_back(Args.MakeArgString(CLExtStr));
+  }
+
+  for (const auto &Arg : ForwardedArguments)
+    if (const auto *A = Args.getLastArg(Arg))
+      CmdArgs.push_back(Args.MakeArgString(A->getOption().getPrefixedName()));
+
+  // Only add the default headers if we are compiling OpenCL sources.
+  if ((types::isOpenCL(InputType) ||
+       (Args.hasArg(options::OPT_cl_std_EQ) && types::isSrcFile(InputType))) &&
+      !Args.hasArg(options::OPT_cl_no_stdinc)) {
+    CmdArgs.push_back("-finclude-default-header");
+    CmdArgs.push_back("-fdeclare-opencl-builtins");
+  }
+}
+
+static void RenderHLSLOptions(const ArgList &Args, ArgStringList &CmdArgs,
+                              types::ID InputType) {
+  const unsigned ForwardedArguments[] = {options::OPT_dxil_validator_version,
+                                         options::OPT_D,
+                                         options::OPT_I,
+                                         options::OPT_S,
+                                         options::OPT_O,
+                                         options::OPT_emit_llvm,
+                                         options::OPT_emit_obj,
+                                         options::OPT_disable_llvm_passes,
+                                         options::OPT_fnative_half_type,
+                                         options::OPT_hlsl_entrypoint};
+  if (!types::isHLSL(InputType))
+    return;
+  for (const auto &Arg : ForwardedArguments)
+    if (const auto *A = Args.getLastArg(Arg))
+      A->renderAsInput(Args, CmdArgs);
+  // Add the default headers if dxc_no_stdinc is not set.
+  if (!Args.hasArg(options::OPT_dxc_no_stdinc) &&
+      !Args.hasArg(options::OPT_nostdinc))
+    CmdArgs.push_back("-finclude-default-header");
+}
+
+static void RenderARCMigrateToolOptions(const Driver &D, const ArgList &Args,
+                                        ArgStringList &CmdArgs) {
+  bool ARCMTEnabled = false;
+  if (!Args.hasArg(options::OPT_fno_objc_arc, options::OPT_fobjc_arc)) {
+    if (const Arg *A = Args.getLastArg(options::OPT_ccc_arcmt_check,
+                                       options::OPT_ccc_arcmt_modify,
+                                       options::OPT_ccc_arcmt_migrate)) {
+      ARCMTEnabled = true;
+      switch (A->getOption().getID()) {
+      default: llvm_unreachable("missed a case");
+      case options::OPT_ccc_arcmt_check:
+        CmdArgs.push_back("-arcmt-action=check");
+        break;
+      case options::OPT_ccc_arcmt_modify:
+        CmdArgs.push_back("-arcmt-action=modify");
+        break;
+      case options::OPT_ccc_arcmt_migrate:
+        CmdArgs.push_back("-arcmt-action=migrate");
+        CmdArgs.push_back("-mt-migrate-directory");
+        CmdArgs.push_back(A->getValue());
+
+        Args.AddLastArg(CmdArgs, options::OPT_arcmt_migrate_report_output);
+        Args.AddLastArg(CmdArgs, options::OPT_arcmt_migrate_emit_arc_errors);
+        break;
+      }
+    }
+  } else {
+    Args.ClaimAllArgs(options::OPT_ccc_arcmt_check);
+    Args.ClaimAllArgs(options::OPT_ccc_arcmt_modify);
+    Args.ClaimAllArgs(options::OPT_ccc_arcmt_migrate);
+  }
+
+  if (const Arg *A = Args.getLastArg(options::OPT_ccc_objcmt_migrate)) {
+    if (ARCMTEnabled)
+      D.Diag(diag::err_drv_argument_not_allowed_with)
+          << A->getAsString(Args) << "-ccc-arcmt-migrate";
+
+    CmdArgs.push_back("-mt-migrate-directory");
+    CmdArgs.push_back(A->getValue());
+
+    if (!Args.hasArg(options::OPT_objcmt_migrate_literals,
+                     options::OPT_objcmt_migrate_subscripting,
+                     options::OPT_objcmt_migrate_property)) {
+      // None specified, means enable them all.
+      CmdArgs.push_back("-objcmt-migrate-literals");
+      CmdArgs.push_back("-objcmt-migrate-subscripting");
+      CmdArgs.push_back("-objcmt-migrate-property");
+    } else {
+      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_literals);
+      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_subscripting);
+      Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_property);
+    }
+  } else {
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_literals);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_subscripting);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_property);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_all);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_readonly_property);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_readwrite_property);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_property_dot_syntax);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_annotation);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_instancetype);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_nsmacros);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_protocol_conformance);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_atomic_property);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_returns_innerpointer_property);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_ns_nonatomic_iosonly);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_migrate_designated_init);
+    Args.AddLastArg(CmdArgs, options::OPT_objcmt_allowlist_dir_path);
+  }
+}
+
+static void RenderBuiltinOptions(const ToolChain &TC, const llvm::Triple &T,
+                                 const ArgList &Args, ArgStringList &CmdArgs) {
+  // -fbuiltin is default unless -mkernel is used.
+  bool UseBuiltins =
+      Args.hasFlag(options::OPT_fbuiltin, options::OPT_fno_builtin,
+                   !Args.hasArg(options::OPT_mkernel));
+  if (!UseBuiltins)
+    CmdArgs.push_back("-fno-builtin");
+
+  // -ffreestanding implies -fno-builtin.
+  if (Args.hasArg(options::OPT_ffreestanding))
+    UseBuiltins = false;
+
+  // Process the -fno-builtin-* options.
+  for (const Arg *A : Args.filtered(options::OPT_fno_builtin_)) {
+    A->claim();
+
+    // If -fno-builtin is specified, then there's no need to pass the option to
+    // the frontend.
+    if (UseBuiltins)
+      A->render(Args, CmdArgs);
+  }
+
+  // le32-specific flags:
+  //  -fno-math-builtin: clang should not convert math builtins to intrinsics
+  //                     by default.
+  if (TC.getArch() == llvm::Triple::le32)
+    CmdArgs.push_back("-fno-math-builtin");
+}
+
+bool Driver::getDefaultModuleCachePath(SmallVectorImpl<char> &Result) {
+  if (const char *Str = std::getenv("CLANG_MODULE_CACHE_PATH")) {
+    Twine Path{Str};
+    Path.toVector(Result);
+    return Path.getSingleStringRef() != "";
+  }
+  if (llvm::sys::path::cache_directory(Result)) {
+    llvm::sys::path::append(Result, "clang");
+    llvm::sys::path::append(Result, "ModuleCache");
+    return true;
+  }
+  return false;
+}
+
+static bool RenderModulesOptions(Compilation &C, const Driver &D,
+                                 const ArgList &Args, const InputInfo &Input,
+                                 const InputInfo &Output, const Arg *Std,
+                                 ArgStringList &CmdArgs) {
+  bool IsCXX = types::isCXX(Input.getType());
+  // FIXME: Find a better way to determine whether the input has standard c++
+  // modules support by default.
+  bool HaveStdCXXModules =
+      IsCXX && Std &&
+      (Std->containsValue("c++2a") || Std->containsValue("c++20") ||
+       Std->containsValue("c++2b") || Std->containsValue("c++latest"));
+  bool HaveModules = HaveStdCXXModules;
+
+  // -fmodules enables the use of precompiled modules (off by default).
+  // Users can pass -fno-cxx-modules to turn off modules support for
+  // C++/Objective-C++ programs.
+  bool HaveClangModules = false;
+  if (Args.hasFlag(options::OPT_fmodules, options::OPT_fno_modules, false)) {
+    bool AllowedInCXX = Args.hasFlag(options::OPT_fcxx_modules,
+                                     options::OPT_fno_cxx_modules, true);
+    if (AllowedInCXX || !IsCXX) {
+      CmdArgs.push_back("-fmodules");
+      HaveClangModules = true;
+    }
+  }
+
+  HaveModules |= HaveClangModules;
+  if (Args.hasArg(options::OPT_fmodules_ts)) {
+    D.Diag(diag::warn_deprecated_fmodules_ts_flag);
+    CmdArgs.push_back("-fmodules-ts");
+    HaveModules = true;
+  }
+
+  // -fmodule-maps enables implicit reading of module map files. By default,
+  // this is enabled if we are using Clang's flavor of precompiled modules.
+  if (Args.hasFlag(options::OPT_fimplicit_module_maps,
+                   options::OPT_fno_implicit_module_maps, HaveClangModules))
+    CmdArgs.push_back("-fimplicit-module-maps");
+
+  // -fmodules-decluse checks that modules used are declared so (off by default)
+  Args.addOptInFlag(CmdArgs, options::OPT_fmodules_decluse,
+                    options::OPT_fno_modules_decluse);
+
+  // -fmodules-strict-decluse is like -fmodule-decluse, but also checks that
+  // all #included headers are part of modules.
+  if (Args.hasFlag(options::OPT_fmodules_strict_decluse,
+                   options::OPT_fno_modules_strict_decluse, false))
+    CmdArgs.push_back("-fmodules-strict-decluse");
+
+  // -fno-implicit-modules turns off implicitly compiling modules on demand.
+  bool ImplicitModules = false;
+  if (!Args.hasFlag(options::OPT_fimplicit_modules,
+                    options::OPT_fno_implicit_modules, HaveClangModules)) {
+    if (HaveModules)
+      CmdArgs.push_back("-fno-implicit-modules");
+  } else if (HaveModules) {
+    ImplicitModules = true;
+    // -fmodule-cache-path specifies where our implicitly-built module files
+    // should be written.
+    SmallString<128> Path;
+    if (Arg *A = Args.getLastArg(options::OPT_fmodules_cache_path))
+      Path = A->getValue();
+
+    bool HasPath = true;
+    if (C.isForDiagnostics()) {
+      // When generating crash reports, we want to emit the modules along with
+      // the reproduction sources, so we ignore any provided module path.
+      Path = Output.getFilename();
+      llvm::sys::path::replace_extension(Path, ".cache");
+      llvm::sys::path::append(Path, "modules");
+    } else if (Path.empty()) {
+      // No module path was provided: use the default.
+      HasPath = Driver::getDefaultModuleCachePath(Path);
+    }
+
+    // `HasPath` will only be false if getDefaultModuleCachePath() fails.
+    // That being said, that failure is unlikely and not caching is harmless.
+    if (HasPath) {
+      const char Arg[] = "-fmodules-cache-path=";
+      Path.insert(Path.begin(), Arg, Arg + strlen(Arg));
+      CmdArgs.push_back(Args.MakeArgString(Path));
+    }
+  }
+
+  if (HaveModules) {
+    // -fprebuilt-module-path specifies where to load the prebuilt module files.
+    for (const Arg *A : Args.filtered(options::OPT_fprebuilt_module_path)) {
+      CmdArgs.push_back(Args.MakeArgString(
+          std::string("-fprebuilt-module-path=") + A->getValue()));
+      A->claim();
+    }
+    if (Args.hasFlag(options::OPT_fprebuilt_implicit_modules,
+                     options::OPT_fno_prebuilt_implicit_modules, false))
+      CmdArgs.push_back("-fprebuilt-implicit-modules");
+    if (Args.hasFlag(options::OPT_fmodules_validate_input_files_content,
+                     options::OPT_fno_modules_validate_input_files_content,
+                     false))
+      CmdArgs.push_back("-fvalidate-ast-input-files-content");
+  }
+
+  // -fmodule-name specifies the module that is currently being built (or
+  // used for header checking by -fmodule-maps).
+  Args.AddLastArg(CmdArgs, options::OPT_fmodule_name_EQ);
+
+  // -fmodule-map-file can be used to specify files containing module
+  // definitions.
+  Args.AddAllArgs(CmdArgs, options::OPT_fmodule_map_file);
+
+  // -fbuiltin-module-map can be used to load the clang
+  // builtin headers modulemap file.
+  if (Args.hasArg(options::OPT_fbuiltin_module_map)) {
+    SmallString<128> BuiltinModuleMap(D.ResourceDir);
+    llvm::sys::path::append(BuiltinModuleMap, "include");
+    llvm::sys::path::append(BuiltinModuleMap, "module.modulemap");
+    if (llvm::sys::fs::exists(BuiltinModuleMap))
+      CmdArgs.push_back(
+          Args.MakeArgString("-fmodule-map-file=" + BuiltinModuleMap));
+  }
+
+  // The -fmodule-file=<name>=<file> form specifies the mapping of module
+  // names to precompiled module files (the module is loaded only if used).
+  // The -fmodule-file=<file> form can be used to unconditionally load
+  // precompiled module files (whether used or not).
+  if (HaveModules)
+    Args.AddAllArgs(CmdArgs, options::OPT_fmodule_file);
+  else
+    Args.ClaimAllArgs(options::OPT_fmodule_file);
+
+  // When building modules and generating crashdumps, we need to dump a module
+  // dependency VFS alongside the output.
+  if (HaveClangModules && C.isForDiagnostics()) {
+    SmallString<128> VFSDir(Output.getFilename());
+    llvm::sys::path::replace_extension(VFSDir, ".cache");
+    // Add the cache directory as a temp so the crash diagnostics pick it up.
+    C.addTempFile(Args.MakeArgString(VFSDir));
+
+    llvm::sys::path::append(VFSDir, "vfs");
+    CmdArgs.push_back("-module-dependency-dir");
+    CmdArgs.push_back(Args.MakeArgString(VFSDir));
+  }
+
+  if (HaveClangModules)
+    Args.AddLastArg(CmdArgs, options::OPT_fmodules_user_build_path);
+
+  // Pass through all -fmodules-ignore-macro arguments.
+  Args.AddAllArgs(CmdArgs, options::OPT_fmodules_ignore_macro);
+  Args.AddLastArg(CmdArgs, options::OPT_fmodules_prune_interval);
+  Args.AddLastArg(CmdArgs, options::OPT_fmodules_prune_after);
+
+  if (HaveClangModules) {
+    Args.AddLastArg(CmdArgs, options::OPT_fbuild_session_timestamp);
+
+    if (Arg *A = Args.getLastArg(options::OPT_fbuild_session_file)) {
+      if (Args.hasArg(options::OPT_fbuild_session_timestamp))
+        D.Diag(diag::err_drv_argument_not_allowed_with)
+            << A->getAsString(Args) << "-fbuild-session-timestamp";
+
+      llvm::sys::fs::file_status Status;
+      if (llvm::sys::fs::status(A->getValue(), Status))
+        D.Diag(diag::err_drv_no_such_file) << A->getValue();
+      CmdArgs.push_back(Args.MakeArgString(
+          "-fbuild-session-timestamp=" +
+          Twine((uint64_t)std::chrono::duration_cast<std::chrono::seconds>(
+                    Status.getLastModificationTime().time_since_epoch())
+                    .count())));
+    }
+
+    if (Args.getLastArg(
+            options::OPT_fmodules_validate_once_per_build_session)) {
+      if (!Args.getLastArg(options::OPT_fbuild_session_timestamp,
+                           options::OPT_fbuild_session_file))
+        D.Diag(diag::err_drv_modules_validate_once_requires_timestamp);
+
+      Args.AddLastArg(CmdArgs,
+                      options::OPT_fmodules_validate_once_per_build_session);
+    }
+
+    if (Args.hasFlag(options::OPT_fmodules_validate_system_headers,
+                     options::OPT_fno_modules_validate_system_headers,
+                     ImplicitModules))
+      CmdArgs.push_back("-fmodules-validate-system-headers");
+
+    Args.AddLastArg(CmdArgs,
+                    options::OPT_fmodules_disable_diagnostic_validation);
+  } else {
+    Args.ClaimAllArgs(options::OPT_fbuild_session_timestamp);
+    Args.ClaimAllArgs(options::OPT_fbuild_session_file);
+    Args.ClaimAllArgs(options::OPT_fmodules_validate_once_per_build_session);
+    Args.ClaimAllArgs(options::OPT_fmodules_validate_system_headers);
+    Args.ClaimAllArgs(options::OPT_fno_modules_validate_system_headers);
+    Args.ClaimAllArgs(options::OPT_fmodules_disable_diagnostic_validation);
+  }
+
+  // Claim `-fmodule-output` and `-fmodule-output=` to avoid unused warnings.
+  Args.ClaimAllArgs(options::OPT_fmodule_output);
+  Args.ClaimAllArgs(options::OPT_fmodule_output_EQ);
+
+  return HaveModules;
+}
+
+static void RenderCharacterOptions(const ArgList &Args, const llvm::Triple &T,
+                                   ArgStringList &CmdArgs) {
+  // -fsigned-char is default.
+  if (const Arg *A = Args.getLastArg(options::OPT_fsigned_char,
+                                     options::OPT_fno_signed_char,
+                                     options::OPT_funsigned_char,
+                                     options::OPT_fno_unsigned_char)) {
+    if (A->getOption().matches(options::OPT_funsigned_char) ||
+        A->getOption().matches(options::OPT_fno_signed_char)) {
+      CmdArgs.push_back("-fno-signed-char");
+    }
+  } else if (!isSignedCharDefault(T)) {
+    CmdArgs.push_back("-fno-signed-char");
+  }
+
+  // The default depends on the language standard.
+  Args.AddLastArg(CmdArgs, options::OPT_fchar8__t, options::OPT_fno_char8__t);
+
+  if (const Arg *A = Args.getLastArg(options::OPT_fshort_wchar,
+                                     options::OPT_fno_short_wchar)) {
+    if (A->getOption().matches(options::OPT_fshort_wchar)) {
+      CmdArgs.push_back("-fwchar-type=short");
+      CmdArgs.push_back("-fno-signed-wchar");
+    } else {
+      bool IsARM = T.isARM() || T.isThumb() || T.isAArch64();
+      CmdArgs.push_back("-fwchar-type=int");
+      if (T.isOSzOS() ||
+          (IsARM && !(T.isOSWindows() || T.isOSNetBSD() || T.isOSOpenBSD())))
+        CmdArgs.push_back("-fno-signed-wchar");
+      else
+        CmdArgs.push_back("-fsigned-wchar");
+    }
+  }
+}
+
+static void RenderObjCOptions(const ToolChain &TC, const Driver &D,
+                              const llvm::Triple &T, const ArgList &Args,
+                              ObjCRuntime &Runtime, bool InferCovariantReturns,
+                              const InputInfo &Input, ArgStringList &CmdArgs) {
+  const llvm::Triple::ArchType Arch = TC.getArch();
+
+  // -fobjc-dispatch-method is only relevant with the nonfragile-abi, and legacy
+  // is the default. Except for deployment target of 10.5, next runtime is
+  // always legacy dispatch and -fno-objc-legacy-dispatch gets ignored silently.
+  if (Runtime.isNonFragile()) {
+    if (!Args.hasFlag(options::OPT_fobjc_legacy_dispatch,
+                      options::OPT_fno_objc_legacy_dispatch,
+                      Runtime.isLegacyDispatchDefaultForArch(Arch))) {
+      if (TC.UseObjCMixedDispatch())
+        CmdArgs.push_back("-fobjc-dispatch-method=mixed");
+      else
+        CmdArgs.push_back("-fobjc-dispatch-method=non-legacy");
+    }
+  }
+
+  // When ObjectiveC legacy runtime is in effect on MacOSX, turn on the option
+  // to do Array/Dictionary subscripting by default.
+  if (Arch == llvm::Triple::x86 && T.isMacOSX() &&
+      Runtime.getKind() == ObjCRuntime::FragileMacOSX && Runtime.isNeXTFamily())
+    CmdArgs.push_back("-fobjc-subscripting-legacy-runtime");
+
+  // Allow -fno-objc-arr to trump -fobjc-arr/-fobjc-arc.
+  // NOTE: This logic is duplicated in ToolChains.cpp.
+  if (isObjCAutoRefCount(Args)) {
+    TC.CheckObjCARC();
+
+    CmdArgs.push_back("-fobjc-arc");
+
+    // FIXME: It seems like this entire block, and several around it should be
+    // wrapped in isObjC, but for now we just use it here as this is where it
+    // was being used previously.
+    if (types::isCXX(Input.getType()) && types::isObjC(Input.getType())) {
+      if (TC.GetCXXStdlibType(Args) == ToolChain::CST_Libcxx)
+        CmdArgs.push_back("-fobjc-arc-cxxlib=libc++");
+      else
+        CmdArgs.push_back("-fobjc-arc-cxxlib=libstdc++");
+    }
+
+    // Allow the user to enable full exceptions code emission.
+    // We default off for Objective-C, on for Objective-C++.
+    if (Args.hasFlag(options::OPT_fobjc_arc_exceptions,
+                     options::OPT_fno_objc_arc_exceptions,
+                     /*Default=*/types::isCXX(Input.getType())))
+      CmdArgs.push_back("-fobjc-arc-exceptions");
+  }
+
+  // Silence warning for full exception code emission options when explicitly
+  // set to use no ARC.
+  if (Args.hasArg(options::OPT_fno_objc_arc)) {
+    Args.ClaimAllArgs(options::OPT_fobjc_arc_exceptions);
+    Args.ClaimAllArgs(options::OPT_fno_objc_arc_exceptions);
+  }
+
+  // Allow the user to control whether messages can be converted to runtime
+  // functions.
+  if (types::isObjC(Input.getType())) {
+    auto *Arg = Args.getLastArg(
+        options::OPT_fobjc_convert_messages_to_runtime_calls,
+        options::OPT_fno_objc_convert_messages_to_runtime_calls);
+    if (Arg &&
+        Arg->getOption().matches(
+            options::OPT_fno_objc_convert_messages_to_runtime_calls))
+      CmdArgs.push_back("-fno-objc-convert-messages-to-runtime-calls");
+  }
+
+  // -fobjc-infer-related-result-type is the default, except in the Objective-C
+  // rewriter.
+  if (InferCovariantReturns)
+    CmdArgs.push_back("-fno-objc-infer-related-result-type");
+
+  // Pass down -fobjc-weak or -fno-objc-weak if present.
+  if (types::isObjC(Input.getType())) {
+    auto WeakArg =
+        Args.getLastArg(options::OPT_fobjc_weak, options::OPT_fno_objc_weak);
+    if (!WeakArg) {
+      // nothing to do
+    } else if (!Runtime.allowsWeak()) {
+      if (WeakArg->getOption().matches(options::OPT_fobjc_weak))
+        D.Diag(diag::err_objc_weak_unsupported);
+    } else {
+      WeakArg->render(Args, CmdArgs);
+    }
+  }
+
+  if (Args.hasArg(options::OPT_fobjc_disable_direct_methods_for_testing))
+    CmdArgs.push_back("-fobjc-disable-direct-methods-for-testing");
+}
+
+static void RenderDiagnosticsOptions(const Driver &D, const ArgList &Args,
+                                     ArgStringList &CmdArgs) {
+  bool CaretDefault = true;
+  bool ColumnDefault = true;
+
+  if (const Arg *A = Args.getLastArg(options::OPT__SLASH_diagnostics_classic,
+                                     options::OPT__SLASH_diagnostics_column,
+                                     options::OPT__SLASH_diagnostics_caret)) {
+    switch (A->getOption().getID()) {
+    case options::OPT__SLASH_diagnostics_caret:
+      CaretDefault = true;
+      ColumnDefault = true;
+      break;
+    case options::OPT__SLASH_diagnostics_column:
+      CaretDefault = false;
+      ColumnDefault = true;
+      break;
+    case options::OPT__SLASH_diagnostics_classic:
+      CaretDefault = false;
+      ColumnDefault = false;
+      break;
+    }
+  }
+
+  // -fcaret-diagnostics is default.
+  if (!Args.hasFlag(options::OPT_fcaret_diagnostics,
+                    options::OPT_fno_caret_diagnostics, CaretDefault))
+    CmdArgs.push_back("-fno-caret-diagnostics");
+
+  Args.addOptOutFlag(CmdArgs, options::OPT_fdiagnostics_fixit_info,
+                     options::OPT_fno_diagnostics_fixit_info);
+  Args.addOptOutFlag(CmdArgs, options::OPT_fdiagnostics_show_option,
+                     options::OPT_fno_diagnostics_show_option);
+
+  if (const Arg *A =
+          Args.getLastArg(options::OPT_fdiagnostics_show_category_EQ)) {
+    CmdArgs.push_back("-fdiagnostics-show-category");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  Args.addOptInFlag(CmdArgs, options::OPT_fdiagnostics_show_hotness,
+                    options::OPT_fno_diagnostics_show_hotness);
+
+  if (const Arg *A =
+          Args.getLastArg(options::OPT_fdiagnostics_hotness_threshold_EQ)) {
+    std::string Opt =
+        std::string("-fdiagnostics-hotness-threshold=") + A->getValue();
+    CmdArgs.push_back(Args.MakeArgString(Opt));
+  }
+
+  if (const Arg *A = Args.getLastArg(options::OPT_fdiagnostics_format_EQ)) {
+    CmdArgs.push_back("-fdiagnostics-format");
+    CmdArgs.push_back(A->getValue());
+    if (StringRef(A->getValue()) == "sarif" ||
+        StringRef(A->getValue()) == "SARIF")
+      D.Diag(diag::warn_drv_sarif_format_unstable);
+  }
+
+  if (const Arg *A = Args.getLastArg(
+          options::OPT_fdiagnostics_show_note_include_stack,
+          options::OPT_fno_diagnostics_show_note_include_stack)) {
+    const Option &O = A->getOption();
+    if (O.matches(options::OPT_fdiagnostics_show_note_include_stack))
+      CmdArgs.push_back("-fdiagnostics-show-note-include-stack");
+    else
+      CmdArgs.push_back("-fno-diagnostics-show-note-include-stack");
+  }
+
+  // Color diagnostics are parsed by the driver directly from argv and later
+  // re-parsed to construct this job; claim any possible color diagnostic here
+  // to avoid warn_drv_unused_argument and diagnose bad
+  // OPT_fdiagnostics_color_EQ values.
+  Args.getLastArg(options::OPT_fcolor_diagnostics,
+                  options::OPT_fno_color_diagnostics);
+  if (const Arg *A = Args.getLastArg(options::OPT_fdiagnostics_color_EQ)) {
+    StringRef Value(A->getValue());
+    if (Value != "always" && Value != "never" && Value != "auto")
+      D.Diag(diag::err_drv_invalid_argument_to_option)
+          << Value << A->getOption().getName();
+  }
+
+  if (D.getDiags().getDiagnosticOptions().ShowColors)
+    CmdArgs.push_back("-fcolor-diagnostics");
+
+  if (Args.hasArg(options::OPT_fansi_escape_codes))
+    CmdArgs.push_back("-fansi-escape-codes");
+
+  Args.addOptOutFlag(CmdArgs, options::OPT_fshow_source_location,
+                     options::OPT_fno_show_source_location);
+
+  if (Args.hasArg(options::OPT_fdiagnostics_absolute_paths))
+    CmdArgs.push_back("-fdiagnostics-absolute-paths");
+
+  if (!Args.hasFlag(options::OPT_fshow_column, options::OPT_fno_show_column,
+                    ColumnDefault))
+    CmdArgs.push_back("-fno-show-column");
+
+  Args.addOptOutFlag(CmdArgs, options::OPT_fspell_checking,
+                     options::OPT_fno_spell_checking);
+}
+
+DwarfFissionKind tools::getDebugFissionKind(const Driver &D,
+                                            const ArgList &Args, Arg *&Arg) {
+  Arg = Args.getLastArg(options::OPT_gsplit_dwarf, options::OPT_gsplit_dwarf_EQ,
+                        options::OPT_gno_split_dwarf);
+  if (!Arg || Arg->getOption().matches(options::OPT_gno_split_dwarf))
+    return DwarfFissionKind::None;
+
+  if (Arg->getOption().matches(options::OPT_gsplit_dwarf))
+    return DwarfFissionKind::Split;
+
+  StringRef Value = Arg->getValue();
+  if (Value == "split")
+    return DwarfFissionKind::Split;
+  if (Value == "single")
+    return DwarfFissionKind::Single;
+
+  D.Diag(diag::err_drv_unsupported_option_argument)
+      << Arg->getSpelling() << Arg->getValue();
+  return DwarfFissionKind::None;
+}
+
+static void renderDwarfFormat(const Driver &D, const llvm::Triple &T,
+                              const ArgList &Args, ArgStringList &CmdArgs,
+                              unsigned DwarfVersion) {
+  auto *DwarfFormatArg =
+      Args.getLastArg(options::OPT_gdwarf64, options::OPT_gdwarf32);
+  if (!DwarfFormatArg)
+    return;
+
+  if (DwarfFormatArg->getOption().matches(options::OPT_gdwarf64)) {
+    if (DwarfVersion < 3)
+      D.Diag(diag::err_drv_argument_only_allowed_with)
+          << DwarfFormatArg->getAsString(Args) << "DWARFv3 or greater";
+    else if (!T.isArch64Bit())
+      D.Diag(diag::err_drv_argument_only_allowed_with)
+          << DwarfFormatArg->getAsString(Args) << "64 bit architecture";
+    else if (!T.isOSBinFormatELF())
+      D.Diag(diag::err_drv_argument_only_allowed_with)
+          << DwarfFormatArg->getAsString(Args) << "ELF platforms";
+  }
+
+  DwarfFormatArg->render(Args, CmdArgs);
+}
+
+static void renderDebugOptions(const ToolChain &TC, const Driver &D,
+                               const llvm::Triple &T, const ArgList &Args,
+                               bool EmitCodeView, bool IRInput,
+                               ArgStringList &CmdArgs,
+                               codegenoptions::DebugInfoKind &DebugInfoKind,
+                               DwarfFissionKind &DwarfFission) {
+  if (Args.hasFlag(options::OPT_fdebug_info_for_profiling,
+                   options::OPT_fno_debug_info_for_profiling, false) &&
+      checkDebugInfoOption(
+          Args.getLastArg(options::OPT_fdebug_info_for_profiling), Args, D, TC))
+    CmdArgs.push_back("-fdebug-info-for-profiling");
+
+  // The 'g' groups options involve a somewhat intricate sequence of decisions
+  // about what to pass from the driver to the frontend, but by the time they
+  // reach cc1 they've been factored into three well-defined orthogonal choices:
+  //  * what level of debug info to generate
+  //  * what dwarf version to write
+  //  * what debugger tuning to use
+  // This avoids having to monkey around further in cc1 other than to disable
+  // codeview if not running in a Windows environment. Perhaps even that
+  // decision should be made in the driver as well though.
+  llvm::DebuggerKind DebuggerTuning = TC.getDefaultDebuggerTuning();
+
+  bool SplitDWARFInlining =
+      Args.hasFlag(options::OPT_fsplit_dwarf_inlining,
+                   options::OPT_fno_split_dwarf_inlining, false);
+
+  // Normally -gsplit-dwarf is only useful with -gN. For IR input, Clang does
+  // object file generation and no IR generation, -gN should not be needed. So
+  // allow -gsplit-dwarf with either -gN or IR input.
+  if (IRInput || Args.hasArg(options::OPT_g_Group)) {
+    Arg *SplitDWARFArg;
+    DwarfFission = getDebugFissionKind(D, Args, SplitDWARFArg);
+    if (DwarfFission != DwarfFissionKind::None &&
+        !checkDebugInfoOption(SplitDWARFArg, Args, D, TC)) {
+      DwarfFission = DwarfFissionKind::None;
+      SplitDWARFInlining = false;
+    }
+  }
+  if (const Arg *A = Args.getLastArg(options::OPT_g_Group)) {
+    DebugInfoKind = codegenoptions::DebugInfoConstructor;
+
+    // If the last option explicitly specified a debug-info level, use it.
+    if (checkDebugInfoOption(A, Args, D, TC) &&
+        A->getOption().matches(options::OPT_gN_Group)) {
+      DebugInfoKind = DebugLevelToInfoKind(*A);
+      // For -g0 or -gline-tables-only, drop -gsplit-dwarf. This gets a bit more
+      // complicated if you've disabled inline info in the skeleton CUs
+      // (SplitDWARFInlining) - then there's value in composing split-dwarf and
+      // line-tables-only, so let those compose naturally in that case.
+      if (DebugInfoKind == codegenoptions::NoDebugInfo ||
+          DebugInfoKind == codegenoptions::DebugDirectivesOnly ||
+          (DebugInfoKind == codegenoptions::DebugLineTablesOnly &&
+           SplitDWARFInlining))
+        DwarfFission = DwarfFissionKind::None;
+    }
+  }
+
+  // If a debugger tuning argument appeared, remember it.
+  bool HasDebuggerTuning = false;
+  if (const Arg *A =
+          Args.getLastArg(options::OPT_gTune_Group, options::OPT_ggdbN_Group)) {
+    HasDebuggerTuning = true;
+    if (checkDebugInfoOption(A, Args, D, TC)) {
+      if (A->getOption().matches(options::OPT_glldb))
+        DebuggerTuning = llvm::DebuggerKind::LLDB;
+      else if (A->getOption().matches(options::OPT_gsce))
+        DebuggerTuning = llvm::DebuggerKind::SCE;
+      else if (A->getOption().matches(options::OPT_gdbx))
+        DebuggerTuning = llvm::DebuggerKind::DBX;
+      else
+        DebuggerTuning = llvm::DebuggerKind::GDB;
+    }
+  }
+
+  // If a -gdwarf argument appeared, remember it.
+  bool EmitDwarf = false;
+  if (const Arg *A = getDwarfNArg(Args))
+    EmitDwarf = checkDebugInfoOption(A, Args, D, TC);
+
+  if (const Arg *A = Args.getLastArg(options::OPT_gcodeview))
+    EmitCodeView = checkDebugInfoOption(A, Args, D, TC);
+
+  // If the user asked for debug info but did not explicitly specify -gcodeview
+  // or -gdwarf, ask the toolchain for the default format.
+  if (!EmitCodeView && !EmitDwarf &&
+      DebugInfoKind != codegenoptions::NoDebugInfo) {
+    switch (TC.getDefaultDebugFormat()) {
+    case codegenoptions::DIF_CodeView:
+      EmitCodeView = true;
+      break;
+    case codegenoptions::DIF_DWARF:
+      EmitDwarf = true;
+      break;
+    }
+  }
+
+  unsigned RequestedDWARFVersion = 0; // DWARF version requested by the user
+  unsigned EffectiveDWARFVersion = 0; // DWARF version TC can generate. It may
+                                      // be lower than what the user wanted.
+  if (EmitDwarf) {
+    RequestedDWARFVersion = getDwarfVersion(TC, Args);
+    // Clamp effective DWARF version to the max supported by the toolchain.
+    EffectiveDWARFVersion =
+        std::min(RequestedDWARFVersion, TC.getMaxDwarfVersion());
+  } else {
+    Args.ClaimAllArgs(options::OPT_fdebug_default_version);
+  }
+
+  // -gline-directives-only supported only for the DWARF debug info.
+  if (RequestedDWARFVersion == 0 &&
+      DebugInfoKind == codegenoptions::DebugDirectivesOnly)
+    DebugInfoKind = codegenoptions::NoDebugInfo;
+
+  // strict DWARF is set to false by default. But for DBX, we need it to be set
+  // as true by default.
+  if (const Arg *A = Args.getLastArg(options::OPT_gstrict_dwarf))
+    (void)checkDebugInfoOption(A, Args, D, TC);
+  if (Args.hasFlag(options::OPT_gstrict_dwarf, options::OPT_gno_strict_dwarf,
+                   DebuggerTuning == llvm::DebuggerKind::DBX))
+    CmdArgs.push_back("-gstrict-dwarf");
+
+  // And we handle flag -grecord-gcc-switches later with DWARFDebugFlags.
+  Args.ClaimAllArgs(options::OPT_g_flags_Group);
+
+  // Column info is included by default for everything except SCE and
+  // CodeView. Clang doesn't track end columns, just starting columns, which,
+  // in theory, is fine for CodeView (and PDB).  In practice, however, the
+  // Microsoft debuggers don't handle missing end columns well, and the AIX
+  // debugger DBX also doesn't handle the columns well, so it's better not to
+  // include any column info.
+  if (const Arg *A = Args.getLastArg(options::OPT_gcolumn_info))
+    (void)checkDebugInfoOption(A, Args, D, TC);
+  if (!Args.hasFlag(options::OPT_gcolumn_info, options::OPT_gno_column_info,
+                    !EmitCodeView &&
+                        (DebuggerTuning != llvm::DebuggerKind::SCE &&
+                         DebuggerTuning != llvm::DebuggerKind::DBX)))
+    CmdArgs.push_back("-gno-column-info");
+
+  // FIXME: Move backend command line options to the module.
+  if (Args.hasFlag(options::OPT_gmodules, options::OPT_gno_modules, false)) {
+    // If -gline-tables-only or -gline-directives-only is the last option it
+    // wins.
+    if (checkDebugInfoOption(Args.getLastArg(options::OPT_gmodules), Args, D,
+                             TC)) {
+      if (DebugInfoKind != codegenoptions::DebugLineTablesOnly &&
+          DebugInfoKind != codegenoptions::DebugDirectivesOnly) {
+        DebugInfoKind = codegenoptions::DebugInfoConstructor;
+        CmdArgs.push_back("-dwarf-ext-refs");
+        CmdArgs.push_back("-fmodule-format=obj");
+      }
+    }
+  }
+
+  if (T.isOSBinFormatELF() && SplitDWARFInlining)
+    CmdArgs.push_back("-fsplit-dwarf-inlining");
+
+  // After we've dealt with all combinations of things that could
+  // make DebugInfoKind be other than None or DebugLineTablesOnly,
+  // figure out if we need to "upgrade" it to standalone debug info.
+  // We parse these two '-f' options whether or not they will be used,
+  // to claim them even if you wrote "-fstandalone-debug -gline-tables-only"
+  bool NeedFullDebug = Args.hasFlag(
+      options::OPT_fstandalone_debug, options::OPT_fno_standalone_debug,
+      DebuggerTuning == llvm::DebuggerKind::LLDB ||
+          TC.GetDefaultStandaloneDebug());
+  if (const Arg *A = Args.getLastArg(options::OPT_fstandalone_debug))
+    (void)checkDebugInfoOption(A, Args, D, TC);
+
+  if (DebugInfoKind == codegenoptions::LimitedDebugInfo ||
+      DebugInfoKind == codegenoptions::DebugInfoConstructor) {
+    if (Args.hasFlag(options::OPT_fno_eliminate_unused_debug_types,
+                     options::OPT_feliminate_unused_debug_types, false))
+      DebugInfoKind = codegenoptions::UnusedTypeInfo;
+    else if (NeedFullDebug)
+      DebugInfoKind = codegenoptions::FullDebugInfo;
+  }
+
+  if (Args.hasFlag(options::OPT_gembed_source, options::OPT_gno_embed_source,
+                   false)) {
+    // Source embedding is a vendor extension to DWARF v5. By now we have
+    // checked if a DWARF version was stated explicitly, and have otherwise
+    // fallen back to the target default, so if this is still not at least 5
+    // we emit an error.
+    const Arg *A = Args.getLastArg(options::OPT_gembed_source);
+    if (RequestedDWARFVersion < 5)
+      D.Diag(diag::err_drv_argument_only_allowed_with)
+          << A->getAsString(Args) << "-gdwarf-5";
+    else if (EffectiveDWARFVersion < 5)
+      // The toolchain has reduced allowed dwarf version, so we can't enable
+      // -gembed-source.
+      D.Diag(diag::warn_drv_dwarf_version_limited_by_target)
+          << A->getAsString(Args) << TC.getTripleString() << 5
+          << EffectiveDWARFVersion;
+    else if (checkDebugInfoOption(A, Args, D, TC))
+      CmdArgs.push_back("-gembed-source");
+  }
+
+  if (EmitCodeView) {
+    CmdArgs.push_back("-gcodeview");
+
+    Args.addOptInFlag(CmdArgs, options::OPT_gcodeview_ghash,
+                      options::OPT_gno_codeview_ghash);
+
+    Args.addOptOutFlag(CmdArgs, options::OPT_gcodeview_command_line,
+                       options::OPT_gno_codeview_command_line);
+  }
+
+  Args.addOptOutFlag(CmdArgs, options::OPT_ginline_line_tables,
+                     options::OPT_gno_inline_line_tables);
+
+  // When emitting remarks, we need at least debug lines in the output.
+  if (willEmitRemarks(Args) &&
+      DebugInfoKind <= codegenoptions::DebugDirectivesOnly)
+    DebugInfoKind = codegenoptions::DebugLineTablesOnly;
+
+  // Adjust the debug info kind for the given toolchain.
+  TC.adjustDebugInfoKind(DebugInfoKind, Args);
+
+  // On AIX, the debugger tuning option can be omitted if it is not explicitly
+  // set.
+  RenderDebugEnablingArgs(Args, CmdArgs, DebugInfoKind, EffectiveDWARFVersion,
+                          T.isOSAIX() && !HasDebuggerTuning
+                              ? llvm::DebuggerKind::Default
+                              : DebuggerTuning);
+
+  // -fdebug-macro turns on macro debug info generation.
+  if (Args.hasFlag(options::OPT_fdebug_macro, options::OPT_fno_debug_macro,
+                   false))
+    if (checkDebugInfoOption(Args.getLastArg(options::OPT_fdebug_macro), Args,
+                             D, TC))
+      CmdArgs.push_back("-debug-info-macro");
+
+  // -ggnu-pubnames turns on gnu style pubnames in the backend.
+  const auto *PubnamesArg =
+      Args.getLastArg(options::OPT_ggnu_pubnames, options::OPT_gno_gnu_pubnames,
+                      options::OPT_gpubnames, options::OPT_gno_pubnames);
+  if (DwarfFission != DwarfFissionKind::None ||
+      (PubnamesArg && checkDebugInfoOption(PubnamesArg, Args, D, TC)))
+    if (!PubnamesArg ||
+        (!PubnamesArg->getOption().matches(options::OPT_gno_gnu_pubnames) &&
+         !PubnamesArg->getOption().matches(options::OPT_gno_pubnames)))
+      CmdArgs.push_back(PubnamesArg && PubnamesArg->getOption().matches(
+                                           options::OPT_gpubnames)
+                            ? "-gpubnames"
+                            : "-ggnu-pubnames");
+  const auto *SimpleTemplateNamesArg =
+      Args.getLastArg(options::OPT_gsimple_template_names,
+                      options::OPT_gno_simple_template_names);
+  bool ForwardTemplateParams = DebuggerTuning == llvm::DebuggerKind::SCE;
+  if (SimpleTemplateNamesArg &&
+      checkDebugInfoOption(SimpleTemplateNamesArg, Args, D, TC)) {
+    const auto &Opt = SimpleTemplateNamesArg->getOption();
+    if (Opt.matches(options::OPT_gsimple_template_names)) {
+      ForwardTemplateParams = true;
+      CmdArgs.push_back("-gsimple-template-names=simple");
+    }
+  }
+
+  if (const Arg *A = Args.getLastArg(options::OPT_gsrc_hash_EQ)) {
+    StringRef v = A->getValue();
+    CmdArgs.push_back(Args.MakeArgString("-gsrc-hash=" + v));
+  }
+
+  Args.addOptInFlag(CmdArgs, options::OPT_fdebug_ranges_base_address,
+                    options::OPT_fno_debug_ranges_base_address);
+
+  // -gdwarf-aranges turns on the emission of the aranges section in the
+  // backend.
+  // Always enabled for SCE tuning.
+  bool NeedAranges = DebuggerTuning == llvm::DebuggerKind::SCE;
+  if (const Arg *A = Args.getLastArg(options::OPT_gdwarf_aranges))
+    NeedAranges = checkDebugInfoOption(A, Args, D, TC) || NeedAranges;
+  if (NeedAranges) {
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back("-generate-arange-section");
+  }
+
+  Args.addOptInFlag(CmdArgs, options::OPT_fforce_dwarf_frame,
+                    options::OPT_fno_force_dwarf_frame);
+
+  if (Args.hasFlag(options::OPT_fdebug_types_section,
+                   options::OPT_fno_debug_types_section, false)) {
+    if (!(T.isOSBinFormatELF() || T.isOSBinFormatWasm())) {
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << Args.getLastArg(options::OPT_fdebug_types_section)
+                 ->getAsString(Args)
+          << T.getTriple();
+    } else if (checkDebugInfoOption(
+                   Args.getLastArg(options::OPT_fdebug_types_section), Args, D,
+                   TC)) {
+      CmdArgs.push_back("-mllvm");
+      CmdArgs.push_back("-generate-type-units");
+    }
+  }
+
+  // To avoid join/split of directory+filename, the integrated assembler prefers
+  // the directory form of .file on all DWARF versions. GNU as doesn't allow the
+  // form before DWARF v5.
+  if (!Args.hasFlag(options::OPT_fdwarf_directory_asm,
+                    options::OPT_fno_dwarf_directory_asm,
+                    TC.useIntegratedAs() || EffectiveDWARFVersion >= 5))
+    CmdArgs.push_back("-fno-dwarf-directory-asm");
+
+  // Decide how to render forward declarations of template instantiations.
+  // SCE wants full descriptions, others just get them in the name.
+  if (ForwardTemplateParams)
+    CmdArgs.push_back("-debug-forward-template-params");
+
+  // Do we need to explicitly import anonymous namespaces into the parent
+  // scope?
+  if (DebuggerTuning == llvm::DebuggerKind::SCE)
+    CmdArgs.push_back("-dwarf-explicit-import");
+
+  renderDwarfFormat(D, T, Args, CmdArgs, EffectiveDWARFVersion);
+  RenderDebugInfoCompressionArgs(Args, CmdArgs, D, TC);
+}
+
+static void ProcessVSRuntimeLibrary(const ArgList &Args,
+                                    ArgStringList &CmdArgs) {
+  unsigned RTOptionID = options::OPT__SLASH_MT;
+
+  if (Args.hasArg(options::OPT__SLASH_LDd))
+    // The /LDd option implies /MTd. The dependent lib part can be overridden,
+    // but defining _DEBUG is sticky.
+    RTOptionID = options::OPT__SLASH_MTd;
+
+  if (Arg *A = Args.getLastArg(options::OPT__SLASH_M_Group))
+    RTOptionID = A->getOption().getID();
+
+  if (Arg *A = Args.getLastArg(options::OPT_fms_runtime_lib_EQ)) {
+    RTOptionID = llvm::StringSwitch<unsigned>(A->getValue())
+                     .Case("static", options::OPT__SLASH_MT)
+                     .Case("static_dbg", options::OPT__SLASH_MTd)
+                     .Case("dll", options::OPT__SLASH_MD)
+                     .Case("dll_dbg", options::OPT__SLASH_MDd)
+                     .Default(options::OPT__SLASH_MT);
+  }
+
+  StringRef FlagForCRT;
+  switch (RTOptionID) {
+  case options::OPT__SLASH_MD:
+    if (Args.hasArg(options::OPT__SLASH_LDd))
+      CmdArgs.push_back("-D_DEBUG");
+    CmdArgs.push_back("-D_MT");
+    CmdArgs.push_back("-D_DLL");
+    FlagForCRT = "--dependent-lib=msvcrt";
+    break;
+  case options::OPT__SLASH_MDd:
+    CmdArgs.push_back("-D_DEBUG");
+    CmdArgs.push_back("-D_MT");
+    CmdArgs.push_back("-D_DLL");
+    FlagForCRT = "--dependent-lib=msvcrtd";
+    break;
+  case options::OPT__SLASH_MT:
+    if (Args.hasArg(options::OPT__SLASH_LDd))
+      CmdArgs.push_back("-D_DEBUG");
+    CmdArgs.push_back("-D_MT");
+    CmdArgs.push_back("-flto-visibility-public-std");
+    FlagForCRT = "--dependent-lib=libcmt";
+    break;
+  case options::OPT__SLASH_MTd:
+    CmdArgs.push_back("-D_DEBUG");
+    CmdArgs.push_back("-D_MT");
+    CmdArgs.push_back("-flto-visibility-public-std");
+    FlagForCRT = "--dependent-lib=libcmtd";
+    break;
+  default:
+    llvm_unreachable("Unexpected option ID.");
+  }
+
+  if (Args.hasArg(options::OPT_fms_omit_default_lib)) {
+    CmdArgs.push_back("-D_VC_NODEFAULTLIB");
+  } else {
+    CmdArgs.push_back(FlagForCRT.data());
+
+    // This provides POSIX compatibility (maps 'open' to '_open'), which most
+    // users want.  The /Za flag to cl.exe turns this off, but it's not
+    // implemented in clang.
+    CmdArgs.push_back("--dependent-lib=oldnames");
+  }
+}
+
+void Clang::ConstructJob(Compilation &C, const JobAction &JA,
+                         const InputInfo &Output, const InputInfoList &Inputs,
+                         const ArgList &Args, const char *LinkingOutput) const {
+  const auto &TC = getToolChain();
+  const llvm::Triple &RawTriple = TC.getTriple();
+  const llvm::Triple &Triple = TC.getEffectiveTriple();
+  const std::string &TripleStr = Triple.getTriple();
+
+  bool KernelOrKext =
+      Args.hasArg(options::OPT_mkernel, options::OPT_fapple_kext);
+  const Driver &D = TC.getDriver();
+  ArgStringList CmdArgs;
+
+  assert(Inputs.size() >= 1 && "Must have at least one input.");
+  // CUDA/HIP compilation may have multiple inputs (source file + results of
+  // device-side compilations). OpenMP device jobs also take the host IR as a
+  // second input. Module precompilation accepts a list of header files to
+  // include as part of the module. API extraction accepts a list of header
+  // files whose API information is emitted in the output. All other jobs are
+  // expected to have exactly one input.
+  bool IsCuda = JA.isOffloading(Action::OFK_Cuda);
+  bool IsCudaDevice = JA.isDeviceOffloading(Action::OFK_Cuda);
+  bool IsHIP = JA.isOffloading(Action::OFK_HIP);
+  bool IsHIPDevice = JA.isDeviceOffloading(Action::OFK_HIP);
+  bool IsOpenMPDevice = JA.isDeviceOffloading(Action::OFK_OpenMP);
+  bool IsExtractAPI = isa<ExtractAPIJobAction>(JA);
+  bool IsDeviceOffloadAction = !(JA.isDeviceOffloading(Action::OFK_None) ||
+                                 JA.isDeviceOffloading(Action::OFK_Host));
+  bool IsHostOffloadingAction =
+      JA.isHostOffloading(Action::OFK_OpenMP) ||
+      (JA.isHostOffloading(C.getActiveOffloadKinds()) &&
+       Args.hasFlag(options::OPT_offload_new_driver,
+                    options::OPT_no_offload_new_driver, false));
+
+  bool IsRDCMode =
+      Args.hasFlag(options::OPT_fgpu_rdc, options::OPT_fno_gpu_rdc, false);
+  bool IsUsingLTO = D.isUsingLTO(IsDeviceOffloadAction);
+  auto LTOMode = D.getLTOMode(IsDeviceOffloadAction);
+
+  // Extract API doesn't have a main input file, so invent a fake one as a
+  // placeholder.
+  InputInfo ExtractAPIPlaceholderInput(Inputs[0].getType(), "extract-api",
+                                       "extract-api");
+
+  const InputInfo &Input =
+      IsExtractAPI ? ExtractAPIPlaceholderInput : Inputs[0];
+
+  InputInfoList ExtractAPIInputs;
+  InputInfoList HostOffloadingInputs;
+  const InputInfo *CudaDeviceInput = nullptr;
+  const InputInfo *OpenMPDeviceInput = nullptr;
+  for (const InputInfo &I : Inputs) {
+    if (&I == &Input || I.getType() == types::TY_Nothing) {
+      // This is the primary input or contains nothing.
+    } else if (IsExtractAPI) {
+      auto ExpectedInputType = ExtractAPIPlaceholderInput.getType();
+      if (I.getType() != ExpectedInputType) {
+        D.Diag(diag::err_drv_extract_api_wrong_kind)
+            << I.getFilename() << types::getTypeName(I.getType())
+            << types::getTypeName(ExpectedInputType);
+      }
+      ExtractAPIInputs.push_back(I);
+    } else if (IsHostOffloadingAction) {
+      HostOffloadingInputs.push_back(I);
+    } else if ((IsCuda || IsHIP) && !CudaDeviceInput) {
+      CudaDeviceInput = &I;
+    } else if (IsOpenMPDevice && !OpenMPDeviceInput) {
+      OpenMPDeviceInput = &I;
+    } else {
+      llvm_unreachable("unexpectedly given multiple inputs");
+    }
+  }
+
+  const llvm::Triple *AuxTriple =
+      (IsCuda || IsHIP) ? TC.getAuxTriple() : nullptr;
+  bool IsWindowsMSVC = RawTriple.isWindowsMSVCEnvironment();
+  bool IsIAMCU = RawTriple.isOSIAMCU();
+
+  // Adjust IsWindowsXYZ for CUDA/HIP compilations.  Even when compiling in
+  // device mode (i.e., getToolchain().getTriple() is NVPTX/AMDGCN, not
+  // Windows), we need to pass Windows-specific flags to cc1.
+  if (IsCuda || IsHIP)
+    IsWindowsMSVC |= AuxTriple && AuxTriple->isWindowsMSVCEnvironment();
+
+  // C++ is not supported for IAMCU.
+  if (IsIAMCU && types::isCXX(Input.getType()))
+    D.Diag(diag::err_drv_clang_unsupported) << "C++ for IAMCU";
+
+  // Invoke ourselves in -cc1 mode.
+  //
+  // FIXME: Implement custom jobs for internal actions.
+  CmdArgs.push_back("-cc1");
+
+  // Add the "effective" target triple.
+  CmdArgs.push_back("-triple");
+  CmdArgs.push_back(Args.MakeArgString(TripleStr));
+
+  if (const Arg *MJ = Args.getLastArg(options::OPT_MJ)) {
+    DumpCompilationDatabase(C, MJ->getValue(), TripleStr, Output, Input, Args);
+    Args.ClaimAllArgs(options::OPT_MJ);
+  } else if (const Arg *GenCDBFragment =
+                 Args.getLastArg(options::OPT_gen_cdb_fragment_path)) {
+    DumpCompilationDatabaseFragmentToDir(GenCDBFragment->getValue(), C,
+                                         TripleStr, Output, Input, Args);
+    Args.ClaimAllArgs(options::OPT_gen_cdb_fragment_path);
+  }
+
+  if (IsCuda || IsHIP) {
+    // We have to pass the triple of the host if compiling for a CUDA/HIP device
+    // and vice-versa.
+    std::string NormalizedTriple;
+    if (JA.isDeviceOffloading(Action::OFK_Cuda) ||
+        JA.isDeviceOffloading(Action::OFK_HIP))
+      NormalizedTriple = C.getSingleOffloadToolChain<Action::OFK_Host>()
+                             ->getTriple()
+                             .normalize();
+    else {
+      // Host-side compilation.
+      NormalizedTriple =
+          (IsCuda ? C.getSingleOffloadToolChain<Action::OFK_Cuda>()
+                  : C.getSingleOffloadToolChain<Action::OFK_HIP>())
+              ->getTriple()
+              .normalize();
+      if (IsCuda) {
+        // We need to figure out which CUDA version we're compiling for, as that
+        // determines how we load and launch GPU kernels.
+        auto *CTC = static_cast<const toolchains::CudaToolChain *>(
+            C.getSingleOffloadToolChain<Action::OFK_Cuda>());
+        assert(CTC && "Expected valid CUDA Toolchain.");
+        if (CTC && CTC->CudaInstallation.version() != CudaVersion::UNKNOWN)
+          CmdArgs.push_back(Args.MakeArgString(
+              Twine("-target-sdk-version=") +
+              CudaVersionToString(CTC->CudaInstallation.version())));
+      }
+    }
+    CmdArgs.push_back("-aux-triple");
+    CmdArgs.push_back(Args.MakeArgString(NormalizedTriple));
+  }
+
+  if (Args.hasFlag(options::OPT_fsycl, options::OPT_fno_sycl, false)) {
+    CmdArgs.push_back("-fsycl-is-device");
+
+    if (Arg *A = Args.getLastArg(options::OPT_sycl_std_EQ)) {
+      A->render(Args, CmdArgs);
+    } else {
+      // Ensure the default version in SYCL mode is 2020.
+      CmdArgs.push_back("-sycl-std=2020");
+    }
+  }
+
+  if (IsOpenMPDevice) {
+    // We have to pass the triple of the host if compiling for an OpenMP device.
+    std::string NormalizedTriple =
+        C.getSingleOffloadToolChain<Action::OFK_Host>()
+            ->getTriple()
+            .normalize();
+    CmdArgs.push_back("-aux-triple");
+    CmdArgs.push_back(Args.MakeArgString(NormalizedTriple));
+  }
+
+  if (Triple.isOSWindows() && (Triple.getArch() == llvm::Triple::arm ||
+                               Triple.getArch() == llvm::Triple::thumb)) {
+    unsigned Offset = Triple.getArch() == llvm::Triple::arm ? 4 : 6;
+    unsigned Version = 0;
+    bool Failure =
+        Triple.getArchName().substr(Offset).consumeInteger(10, Version);
+    if (Failure || Version < 7)
+      D.Diag(diag::err_target_unsupported_arch) << Triple.getArchName()
+                                                << TripleStr;
+  }
+
+  // Push all default warning arguments that are specific to
+  // the given target.  These come before user provided warning options
+  // are provided.
+  TC.addClangWarningOptions(CmdArgs);
+
+  // FIXME: Subclass ToolChain for SPIR and move this to addClangWarningOptions.
+  if (Triple.isSPIR() || Triple.isSPIRV())
+    CmdArgs.push_back("-Wspir-compat");
+
+  // Select the appropriate action.
+  RewriteKind rewriteKind = RK_None;
+
+  // If CollectArgsForIntegratedAssembler() isn't called below, claim the args
+  // it claims when not running an assembler. Otherwise, clang would emit
+  // "argument unused" warnings for assembler flags when e.g. adding "-E" to
+  // flags while debugging something. That'd be somewhat inconvenient, and it's
+  // also inconsistent with most other flags -- we don't warn on
+  // -ffunction-sections not being used in -E mode either for example, even
+  // though it's not really used either.
+  if (!isa<AssembleJobAction>(JA)) {
+    // The args claimed here should match the args used in
+    // CollectArgsForIntegratedAssembler().
+    if (TC.useIntegratedAs()) {
+      Args.ClaimAllArgs(options::OPT_mrelax_all);
+      Args.ClaimAllArgs(options::OPT_mno_relax_all);
+      Args.ClaimAllArgs(options::OPT_mincremental_linker_compatible);
+      Args.ClaimAllArgs(options::OPT_mno_incremental_linker_compatible);
+      switch (C.getDefaultToolChain().getArch()) {
+      case llvm::Triple::arm:
+      case llvm::Triple::armeb:
+      case llvm::Triple::thumb:
+      case llvm::Triple::thumbeb:
+        Args.ClaimAllArgs(options::OPT_mimplicit_it_EQ);
+        break;
+      default:
+        break;
+      }
+    }
+    Args.ClaimAllArgs(options::OPT_Wa_COMMA);
+    Args.ClaimAllArgs(options::OPT_Xassembler);
+    Args.ClaimAllArgs(options::OPT_femit_dwarf_unwind_EQ);
+  }
+
+  if (isa<AnalyzeJobAction>(JA)) {
+    assert(JA.getType() == types::TY_Plist && "Invalid output type.");
+    CmdArgs.push_back("-analyze");
+  } else if (isa<MigrateJobAction>(JA)) {
+    CmdArgs.push_back("-migrate");
+  } else if (isa<PreprocessJobAction>(JA)) {
+    if (Output.getType() == types::TY_Dependencies)
+      CmdArgs.push_back("-Eonly");
+    else {
+      CmdArgs.push_back("-E");
+      if (Args.hasArg(options::OPT_rewrite_objc) &&
+          !Args.hasArg(options::OPT_g_Group))
+        CmdArgs.push_back("-P");
+      else if (JA.getType() == types::TY_PP_CXXHeaderUnit)
+        CmdArgs.push_back("-fdirectives-only");
+    }
+  } else if (isa<AssembleJobAction>(JA)) {
+    CmdArgs.push_back("-emit-obj");
+
+    CollectArgsForIntegratedAssembler(C, Args, CmdArgs, D);
+
+    // Also ignore explicit -force_cpusubtype_ALL option.
+    (void)Args.hasArg(options::OPT_force__cpusubtype__ALL);
+  } else if (isa<PrecompileJobAction>(JA)) {
+    if (JA.getType() == types::TY_Nothing)
+      CmdArgs.push_back("-fsyntax-only");
+    else if (JA.getType() == types::TY_ModuleFile)
+      CmdArgs.push_back("-emit-module-interface");
+    else if (JA.getType() == types::TY_HeaderUnit)
+      CmdArgs.push_back("-emit-header-unit");
+    else
+      CmdArgs.push_back("-emit-pch");
+  } else if (isa<VerifyPCHJobAction>(JA)) {
+    CmdArgs.push_back("-verify-pch");
+  } else if (isa<ExtractAPIJobAction>(JA)) {
+    assert(JA.getType() == types::TY_API_INFO &&
+           "Extract API actions must generate a API information.");
+    CmdArgs.push_back("-extract-api");
+    if (Arg *ProductNameArg = Args.getLastArg(options::OPT_product_name_EQ))
+      ProductNameArg->render(Args, CmdArgs);
+    if (Arg *ExtractAPIIgnoresFileArg =
+            Args.getLastArg(options::OPT_extract_api_ignores_EQ))
+      ExtractAPIIgnoresFileArg->render(Args, CmdArgs);
+  } else {
+    assert((isa<CompileJobAction>(JA) || isa<BackendJobAction>(JA)) &&
+           "Invalid action for clang tool.");
+    if (JA.getType() == types::TY_Nothing) {
+      CmdArgs.push_back("-fsyntax-only");
+    } else if (JA.getType() == types::TY_LLVM_IR ||
+               JA.getType() == types::TY_LTO_IR) {
+      CmdArgs.push_back("-emit-llvm");
+    } else if (JA.getType() == types::TY_LLVM_BC ||
+               JA.getType() == types::TY_LTO_BC) {
+      // Emit textual llvm IR for AMDGPU offloading for -emit-llvm -S
+      if (Triple.isAMDGCN() && IsOpenMPDevice && Args.hasArg(options::OPT_S) &&
+          Args.hasArg(options::OPT_emit_llvm)) {
+        CmdArgs.push_back("-emit-llvm");
+      } else {
+        CmdArgs.push_back("-emit-llvm-bc");
+      }
+    } else if (JA.getType() == types::TY_IFS ||
+               JA.getType() == types::TY_IFS_CPP) {
+      StringRef ArgStr =
+          Args.hasArg(options::OPT_interface_stub_version_EQ)
+              ? Args.getLastArgValue(options::OPT_interface_stub_version_EQ)
+              : "ifs-v1";
+      CmdArgs.push_back("-emit-interface-stubs");
+      CmdArgs.push_back(
+          Args.MakeArgString(Twine("-interface-stub-version=") + ArgStr.str()));
+    } else if (JA.getType() == types::TY_PP_Asm) {
+      CmdArgs.push_back("-S");
+    } else if (JA.getType() == types::TY_AST) {
+      CmdArgs.push_back("-emit-pch");
+    } else if (JA.getType() == types::TY_ModuleFile) {
+      CmdArgs.push_back("-module-file-info");
+    } else if (JA.getType() == types::TY_RewrittenObjC) {
+      CmdArgs.push_back("-rewrite-objc");
+      rewriteKind = RK_NonFragile;
+    } else if (JA.getType() == types::TY_RewrittenLegacyObjC) {
+      CmdArgs.push_back("-rewrite-objc");
+      rewriteKind = RK_Fragile;
+    } else {
+      assert(JA.getType() == types::TY_PP_Asm && "Unexpected output type!");
+    }
+
+    // Preserve use-list order by default when emitting bitcode, so that
+    // loading the bitcode up in 'opt' or 'llc' and running passes gives the
+    // same result as running passes here.  For LTO, we don't need to preserve
+    // the use-list order, since serialization to bitcode is part of the flow.
+    if (JA.getType() == types::TY_LLVM_BC)
+      CmdArgs.push_back("-emit-llvm-uselists");
+
+    if (IsUsingLTO) {
+      if (IsDeviceOffloadAction && !JA.isDeviceOffloading(Action::OFK_OpenMP) &&
+          !Args.hasFlag(options::OPT_offload_new_driver,
+                        options::OPT_no_offload_new_driver, false) &&
+          !Triple.isAMDGPU()) {
+        D.Diag(diag::err_drv_unsupported_opt_for_target)
+            << Args.getLastArg(options::OPT_foffload_lto,
+                               options::OPT_foffload_lto_EQ)
+                   ->getAsString(Args)
+            << Triple.getTriple();
+      } else if (Triple.isNVPTX() && !IsRDCMode &&
+                 JA.isDeviceOffloading(Action::OFK_Cuda)) {
+        D.Diag(diag::err_drv_unsupported_opt_for_language_mode)
+            << Args.getLastArg(options::OPT_foffload_lto,
+                               options::OPT_foffload_lto_EQ)
+                   ->getAsString(Args)
+            << "-fno-gpu-rdc";
+      } else {
+        assert(LTOMode == LTOK_Full || LTOMode == LTOK_Thin);
+        CmdArgs.push_back(Args.MakeArgString(
+            Twine("-flto=") + (LTOMode == LTOK_Thin ? "thin" : "full")));
+        CmdArgs.push_back("-flto-unit");
+      }
+    }
+  }
+
+  if (const Arg *A = Args.getLastArg(options::OPT_fthinlto_index_EQ)) {
+    if (!types::isLLVMIR(Input.getType()))
+      D.Diag(diag::err_drv_arg_requires_bitcode_input) << A->getAsString(Args);
+    Args.AddLastArg(CmdArgs, options::OPT_fthinlto_index_EQ);
+  }
+
+  if (Args.getLastArg(options::OPT_fthin_link_bitcode_EQ))
+    Args.AddLastArg(CmdArgs, options::OPT_fthin_link_bitcode_EQ);
+
+  if (Args.getLastArg(options::OPT_save_temps_EQ))
+    Args.AddLastArg(CmdArgs, options::OPT_save_temps_EQ);
+
+  auto *MemProfArg = Args.getLastArg(options::OPT_fmemory_profile,
+                                     options::OPT_fmemory_profile_EQ,
+                                     options::OPT_fno_memory_profile);
+  if (MemProfArg &&
+      !MemProfArg->getOption().matches(options::OPT_fno_memory_profile))
+    MemProfArg->render(Args, CmdArgs);
+
+  // Embed-bitcode option.
+  // Only white-listed flags below are allowed to be embedded.
+  if (C.getDriver().embedBitcodeInObject() && !IsUsingLTO &&
+      (isa<BackendJobAction>(JA) || isa<AssembleJobAction>(JA))) {
+    // Add flags implied by -fembed-bitcode.
+    Args.AddLastArg(CmdArgs, options::OPT_fembed_bitcode_EQ);
+    // Disable all llvm IR level optimizations.
+    CmdArgs.push_back("-disable-llvm-passes");
+
+    // Render target options.
+    TC.addClangTargetOptions(Args, CmdArgs, JA.getOffloadingDeviceKind());
+
+    // reject options that shouldn't be supported in bitcode
+    // also reject kernel/kext
+    static const constexpr unsigned kBitcodeOptionIgnorelist[] = {
+        options::OPT_mkernel,
+        options::OPT_fapple_kext,
+        options::OPT_ffunction_sections,
+        options::OPT_fno_function_sections,
+        options::OPT_fdata_sections,
+        options::OPT_fno_data_sections,
+        options::OPT_fbasic_block_sections_EQ,
+        options::OPT_funique_internal_linkage_names,
+        options::OPT_fno_unique_internal_linkage_names,
+        options::OPT_funique_section_names,
+        options::OPT_fno_unique_section_names,
+        options::OPT_funique_basic_block_section_names,
+        options::OPT_fno_unique_basic_block_section_names,
+        options::OPT_mrestrict_it,
+        options::OPT_mno_restrict_it,
+        options::OPT_mstackrealign,
+        options::OPT_mno_stackrealign,
+        options::OPT_mstack_alignment,
+        options::OPT_mcmodel_EQ,
+        options::OPT_mlong_calls,
+        options::OPT_mno_long_calls,
+        options::OPT_ggnu_pubnames,
+        options::OPT_gdwarf_aranges,
+        options::OPT_fdebug_types_section,
+        options::OPT_fno_debug_types_section,
+        options::OPT_fdwarf_directory_asm,
+        options::OPT_fno_dwarf_directory_asm,
+        options::OPT_mrelax_all,
+        options::OPT_mno_relax_all,
+        options::OPT_ftrap_function_EQ,
+        options::OPT_ffixed_r9,
+        options::OPT_mfix_cortex_a53_835769,
+        options::OPT_mno_fix_cortex_a53_835769,
+        options::OPT_ffixed_x18,
+        options::OPT_mglobal_merge,
+        options::OPT_mno_global_merge,
+        options::OPT_mred_zone,
+        options::OPT_mno_red_zone,
+        options::OPT_Wa_COMMA,
+        options::OPT_Xassembler,
+        options::OPT_mllvm,
+    };
+    for (const auto &A : Args)
+      if (llvm::is_contained(kBitcodeOptionIgnorelist, A->getOption().getID()))
+        D.Diag(diag::err_drv_unsupported_embed_bitcode) << A->getSpelling();
+
+    // Render the CodeGen options that need to be passed.
+    Args.addOptOutFlag(CmdArgs, options::OPT_foptimize_sibling_calls,
+                       options::OPT_fno_optimize_sibling_calls);
+
+    RenderFloatingPointOptions(TC, D, isOptimizationLevelFast(Args), Args,
+                               CmdArgs, JA);
+
+    // Render ABI arguments
+    switch (TC.getArch()) {
+    default: break;
+    case llvm::Triple::arm:
+    case llvm::Triple::armeb:
+    case llvm::Triple::thumbeb:
+      RenderARMABI(D, Triple, Args, CmdArgs);
+      break;
+    case llvm::Triple::aarch64:
+    case llvm::Triple::aarch64_32:
+    case llvm::Triple::aarch64_be:
+      RenderAArch64ABI(Triple, Args, CmdArgs);
+      break;
+    }
+
+    // Optimization level for CodeGen.
+    if (const Arg *A = Args.getLastArg(options::OPT_O_Group)) {
+      if (A->getOption().matches(options::OPT_O4)) {
+        CmdArgs.push_back("-O3");
+        D.Diag(diag::warn_O4_is_O3);
+      } else {
+        A->render(Args, CmdArgs);
+      }
+    }
+
+    // Input/Output file.
+    if (Output.getType() == types::TY_Dependencies) {
+      // Handled with other dependency code.
+    } else if (Output.isFilename()) {
+      CmdArgs.push_back("-o");
+      CmdArgs.push_back(Output.getFilename());
+    } else {
+      assert(Output.isNothing() && "Input output.");
+    }
+
+    for (const auto &II : Inputs) {
+      addDashXForInput(Args, II, CmdArgs);
+      if (II.isFilename())
+        CmdArgs.push_back(II.getFilename());
+      else
+        II.getInputArg().renderAsInput(Args, CmdArgs);
+    }
+
+    C.addCommand(std::make_unique<Command>(
+        JA, *this, ResponseFileSupport::AtFileUTF8(), D.getClangProgramPath(),
+        CmdArgs, Inputs, Output));
+    return;
+  }
+
+  if (C.getDriver().embedBitcodeMarkerOnly() && !IsUsingLTO)
+    CmdArgs.push_back("-fembed-bitcode=marker");
+
+  // We normally speed up the clang process a bit by skipping destructors at
+  // exit, but when we're generating diagnostics we can rely on some of the
+  // cleanup.
+  if (!C.isForDiagnostics())
+    CmdArgs.push_back("-disable-free");
+  CmdArgs.push_back("-clear-ast-before-backend");
+
+#ifdef NDEBUG
+  const bool IsAssertBuild = false;
+#else
+  const bool IsAssertBuild = true;
+#endif
+
+  // Disable the verification pass in -asserts builds.
+  if (!IsAssertBuild)
+    CmdArgs.push_back("-disable-llvm-verifier");
+
+  // Discard value names in assert builds unless otherwise specified.
+  if (Args.hasFlag(options::OPT_fdiscard_value_names,
+                   options::OPT_fno_discard_value_names, !IsAssertBuild)) {
+    if (Args.hasArg(options::OPT_fdiscard_value_names) &&
+        llvm::any_of(Inputs, [](const clang::driver::InputInfo &II) {
+          return types::isLLVMIR(II.getType());
+        })) {
+      D.Diag(diag::warn_ignoring_fdiscard_for_bitcode);
+    }
+    CmdArgs.push_back("-discard-value-names");
+  }
+
+  // Set the main file name, so that debug info works even with
+  // -save-temps.
+  CmdArgs.push_back("-main-file-name");
+  CmdArgs.push_back(getBaseInputName(Args, Input));
+
+  // Some flags which affect the language (via preprocessor
+  // defines).
+  if (Args.hasArg(options::OPT_static))
+    CmdArgs.push_back("-static-define");
+
+  if (Args.hasArg(options::OPT_municode))
+    CmdArgs.push_back("-DUNICODE");
+
+  if (isa<AnalyzeJobAction>(JA))
+    RenderAnalyzerOptions(Args, CmdArgs, Triple, Input);
+
+  if (isa<AnalyzeJobAction>(JA) ||
+      (isa<PreprocessJobAction>(JA) && Args.hasArg(options::OPT__analyze)))
+    CmdArgs.push_back("-setup-static-analyzer");
+
+  // Enable compatilibily mode to avoid analyzer-config related errors.
+  // Since we can't access frontend flags through hasArg, let's manually iterate
+  // through them.
+  bool FoundAnalyzerConfig = false;
+  for (auto *Arg : Args.filtered(options::OPT_Xclang))
+    if (StringRef(Arg->getValue()) == "-analyzer-config") {
+      FoundAnalyzerConfig = true;
+      break;
+    }
+  if (!FoundAnalyzerConfig)
+    for (auto *Arg : Args.filtered(options::OPT_Xanalyzer))
+      if (StringRef(Arg->getValue()) == "-analyzer-config") {
+        FoundAnalyzerConfig = true;
+        break;
+      }
+  if (FoundAnalyzerConfig)
+    CmdArgs.push_back("-analyzer-config-compatibility-mode=true");
+
+  CheckCodeGenerationOptions(D, Args);
+
+  unsigned FunctionAlignment = ParseFunctionAlignment(TC, Args);
+  assert(FunctionAlignment <= 31 && "function alignment will be truncated!");
+  if (FunctionAlignment) {
+    CmdArgs.push_back("-function-alignment");
+    CmdArgs.push_back(Args.MakeArgString(std::to_string(FunctionAlignment)));
+  }
+
+  // We support -falign-loops=N where N is a power of 2. GCC supports more
+  // forms.
+  if (const Arg *A = Args.getLastArg(options::OPT_falign_loops_EQ)) {
+    unsigned Value = 0;
+    if (StringRef(A->getValue()).getAsInteger(10, Value) || Value > 65536)
+      TC.getDriver().Diag(diag::err_drv_invalid_int_value)
+          << A->getAsString(Args) << A->getValue();
+    else if (Value & (Value - 1))
+      TC.getDriver().Diag(diag::err_drv_alignment_not_power_of_two)
+          << A->getAsString(Args) << A->getValue();
+    // Treat =0 as unspecified (use the target preference).
+    if (Value)
+      CmdArgs.push_back(Args.MakeArgString("-falign-loops=" +
+                                           Twine(std::min(Value, 65536u))));
+  }
+
+  llvm::Reloc::Model RelocationModel;
+  unsigned PICLevel;
+  bool IsPIE;
+  std::tie(RelocationModel, PICLevel, IsPIE) = ParsePICArgs(TC, Args);
+  Arg *LastPICDataRelArg =
+      Args.getLastArg(options::OPT_mno_pic_data_is_text_relative,
+                      options::OPT_mpic_data_is_text_relative);
+  bool NoPICDataIsTextRelative = false;
+  if (LastPICDataRelArg) {
+    if (LastPICDataRelArg->getOption().matches(
+            options::OPT_mno_pic_data_is_text_relative)) {
+      NoPICDataIsTextRelative = true;
+      if (!PICLevel)
+        D.Diag(diag::err_drv_argument_only_allowed_with)
+            << "-mno-pic-data-is-text-relative"
+            << "-fpic/-fpie";
+    }
+    if (!Triple.isSystemZ())
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << (NoPICDataIsTextRelative ? "-mno-pic-data-is-text-relative"
+                                      : "-mpic-data-is-text-relative")
+          << RawTriple.str();
+  }
+
+  bool IsROPI = RelocationModel == llvm::Reloc::ROPI ||
+                RelocationModel == llvm::Reloc::ROPI_RWPI;
+  bool IsRWPI = RelocationModel == llvm::Reloc::RWPI ||
+                RelocationModel == llvm::Reloc::ROPI_RWPI;
+
+  if (Args.hasArg(options::OPT_mcmse) &&
+      !Args.hasArg(options::OPT_fallow_unsupported)) {
+    if (IsROPI)
+      D.Diag(diag::err_cmse_pi_are_incompatible) << IsROPI;
+    if (IsRWPI)
+      D.Diag(diag::err_cmse_pi_are_incompatible) << !IsRWPI;
+  }
+
+  if (IsROPI && types::isCXX(Input.getType()) &&
+      !Args.hasArg(options::OPT_fallow_unsupported))
+    D.Diag(diag::err_drv_ropi_incompatible_with_cxx);
+
+  const char *RMName = RelocationModelName(RelocationModel);
+  if (RMName) {
+    CmdArgs.push_back("-mrelocation-model");
+    CmdArgs.push_back(RMName);
+  }
+  if (PICLevel > 0) {
+    CmdArgs.push_back("-pic-level");
+    CmdArgs.push_back(PICLevel == 1 ? "1" : "2");
+    if (IsPIE)
+      CmdArgs.push_back("-pic-is-pie");
+    if (NoPICDataIsTextRelative)
+      CmdArgs.push_back("-mcmodel=medium");
+  }
+
+  if (RelocationModel == llvm::Reloc::ROPI ||
+      RelocationModel == llvm::Reloc::ROPI_RWPI)
+    CmdArgs.push_back("-fropi");
+  if (RelocationModel == llvm::Reloc::RWPI ||
+      RelocationModel == llvm::Reloc::ROPI_RWPI)
+    CmdArgs.push_back("-frwpi");
+
+  if (Arg *A = Args.getLastArg(options::OPT_meabi)) {
+    CmdArgs.push_back("-meabi");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  // -fsemantic-interposition is forwarded to CC1: set the
+  // "SemanticInterposition" metadata to 1 (make some linkages interposable) and
+  // make default visibility external linkage definitions dso_preemptable.
+  //
+  // -fno-semantic-interposition: if the target supports .Lfoo$local local
+  // aliases (make default visibility external linkage definitions dso_local).
+  // This is the CC1 default for ELF to match COFF/Mach-O.
+  //
+  // Otherwise use Clang's traditional behavior: like
+  // -fno-semantic-interposition but local aliases are not used. So references
+  // can be interposed if not optimized out.
+  if (Triple.isOSBinFormatELF()) {
+    Arg *A = Args.getLastArg(options::OPT_fsemantic_interposition,
+                             options::OPT_fno_semantic_interposition);
+    if (RelocationModel != llvm::Reloc::Static && !IsPIE) {
+      // The supported targets need to call AsmPrinter::getSymbolPreferLocal.
+      bool SupportsLocalAlias =
+          Triple.isAArch64() || Triple.isRISCV() || Triple.isX86();
+      if (!A)
+        CmdArgs.push_back("-fhalf-no-semantic-interposition");
+      else if (A->getOption().matches(options::OPT_fsemantic_interposition))
+        A->render(Args, CmdArgs);
+      else if (!SupportsLocalAlias)
+        CmdArgs.push_back("-fhalf-no-semantic-interposition");
+    }
+  }
+
+  {
+    std::string Model;
+    if (Arg *A = Args.getLastArg(options::OPT_mthread_model)) {
+      if (!TC.isThreadModelSupported(A->getValue()))
+        D.Diag(diag::err_drv_invalid_thread_model_for_target)
+            << A->getValue() << A->getAsString(Args);
+      Model = A->getValue();
+    } else
+      Model = TC.getThreadModel();
+    if (Model != "posix") {
+      CmdArgs.push_back("-mthread-model");
+      CmdArgs.push_back(Args.MakeArgString(Model));
+    }
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_fveclib)) {
+    StringRef Name = A->getValue();
+    if (Name == "SVML") {
+      if (Triple.getArch() != llvm::Triple::x86 &&
+          Triple.getArch() != llvm::Triple::x86_64)
+        D.Diag(diag::err_drv_unsupported_opt_for_target)
+            << Name << Triple.getArchName();
+    } else if (Name == "LIBMVEC-X86") {
+      if (Triple.getArch() != llvm::Triple::x86 &&
+          Triple.getArch() != llvm::Triple::x86_64)
+        D.Diag(diag::err_drv_unsupported_opt_for_target)
+            << Name << Triple.getArchName();
+    } else if (Name == "SLEEF") {
+      if (Triple.getArch() != llvm::Triple::aarch64 &&
+          Triple.getArch() != llvm::Triple::aarch64_be)
+        D.Diag(diag::err_drv_unsupported_opt_for_target)
+            << Name << Triple.getArchName();
+    }
+    A->render(Args, CmdArgs);
+  }
+
+  if (Args.hasFlag(options::OPT_fmerge_all_constants,
+                   options::OPT_fno_merge_all_constants, false))
+    CmdArgs.push_back("-fmerge-all-constants");
+
+  Args.addOptOutFlag(CmdArgs, options::OPT_fdelete_null_pointer_checks,
+                     options::OPT_fno_delete_null_pointer_checks);
+
+  // LLVM Code Generator Options.
+
+  for (const Arg *A : Args.filtered(options::OPT_frewrite_map_file_EQ)) {
+    StringRef Map = A->getValue();
+    if (!llvm::sys::fs::exists(Map)) {
+      D.Diag(diag::err_drv_no_such_file) << Map;
+    } else {
+      A->render(Args, CmdArgs);
+      A->claim();
+    }
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ_vec_extabi,
+                               options::OPT_mabi_EQ_vec_default)) {
+    if (!Triple.isOSAIX())
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getSpelling() << RawTriple.str();
+    if (A->getOption().getID() == options::OPT_mabi_EQ_vec_extabi)
+      CmdArgs.push_back("-mabi=vec-extabi");
+    else
+      CmdArgs.push_back("-mabi=vec-default");
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ_quadword_atomics)) {
+    if (!Triple.isOSAIX() || Triple.isPPC32())
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+        << A->getSpelling() << RawTriple.str();
+    CmdArgs.push_back("-mabi=quadword-atomics");
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_mlong_double_128)) {
+    // Emit the unsupported option error until the Clang's library integration
+    // support for 128-bit long double is available for AIX.
+    if (Triple.isOSAIX())
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getSpelling() << RawTriple.str();
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_Wframe_larger_than_EQ)) {
+    StringRef v = A->getValue();
+    // FIXME: Validate the argument here so we don't produce meaningless errors
+    // about -fwarn-stack-size=.
+    if (v.empty())
+      D.Diag(diag::err_drv_missing_argument) << A->getSpelling() << 1;
+    else
+      CmdArgs.push_back(Args.MakeArgString("-fwarn-stack-size=" + v));
+    A->claim();
+  }
+
+  Args.addOptOutFlag(CmdArgs, options::OPT_fjump_tables,
+                     options::OPT_fno_jump_tables);
+  Args.addOptInFlag(CmdArgs, options::OPT_fprofile_sample_accurate,
+                    options::OPT_fno_profile_sample_accurate);
+  Args.addOptOutFlag(CmdArgs, options::OPT_fpreserve_as_comments,
+                     options::OPT_fno_preserve_as_comments);
+
+  if (Arg *A = Args.getLastArg(options::OPT_mregparm_EQ)) {
+    CmdArgs.push_back("-mregparm");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_maix_struct_return,
+                               options::OPT_msvr4_struct_return)) {
+    if (!TC.getTriple().isPPC32()) {
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getSpelling() << RawTriple.str();
+    } else if (A->getOption().matches(options::OPT_maix_struct_return)) {
+      CmdArgs.push_back("-maix-struct-return");
+    } else {
+      assert(A->getOption().matches(options::OPT_msvr4_struct_return));
+      CmdArgs.push_back("-msvr4-struct-return");
+    }
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_fpcc_struct_return,
+                               options::OPT_freg_struct_return)) {
+    if (TC.getArch() != llvm::Triple::x86) {
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getSpelling() << RawTriple.str();
+    } else if (A->getOption().matches(options::OPT_fpcc_struct_return)) {
+      CmdArgs.push_back("-fpcc-struct-return");
+    } else {
+      assert(A->getOption().matches(options::OPT_freg_struct_return));
+      CmdArgs.push_back("-freg-struct-return");
+    }
+  }
+
+  if (Args.hasFlag(options::OPT_mrtd, options::OPT_mno_rtd, false))
+    CmdArgs.push_back("-fdefault-calling-conv=stdcall");
+
+  if (Args.hasArg(options::OPT_fenable_matrix)) {
+    // enable-matrix is needed by both the LangOpts and by LLVM.
+    CmdArgs.push_back("-fenable-matrix");
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back("-enable-matrix");
+  }
+
+  CodeGenOptions::FramePointerKind FPKeepKind =
+                  getFramePointerKind(Args, RawTriple);
+  const char *FPKeepKindStr = nullptr;
+  switch (FPKeepKind) {
+  case CodeGenOptions::FramePointerKind::None:
+    FPKeepKindStr = "-mframe-pointer=none";
+    break;
+  case CodeGenOptions::FramePointerKind::NonLeaf:
+    FPKeepKindStr = "-mframe-pointer=non-leaf";
+    break;
+  case CodeGenOptions::FramePointerKind::All:
+    FPKeepKindStr = "-mframe-pointer=all";
+    break;
+  }
+  assert(FPKeepKindStr && "unknown FramePointerKind");
+  CmdArgs.push_back(FPKeepKindStr);
+
+  Args.addOptOutFlag(CmdArgs, options::OPT_fzero_initialized_in_bss,
+                     options::OPT_fno_zero_initialized_in_bss);
+
+  bool OFastEnabled = isOptimizationLevelFast(Args);
+  // If -Ofast is the optimization level, then -fstrict-aliasing should be
+  // enabled.  This alias option is being used to simplify the hasFlag logic.
+  OptSpecifier StrictAliasingAliasOption =
+      OFastEnabled ? options::OPT_Ofast : options::OPT_fstrict_aliasing;
+  // We turn strict aliasing off by default if we're in CL mode, since MSVC
+  // doesn't do any TBAA.
+  bool TBAAOnByDefault = !D.IsCLMode();
+  if (!Args.hasFlag(options::OPT_fstrict_aliasing, StrictAliasingAliasOption,
+                    options::OPT_fno_strict_aliasing, TBAAOnByDefault))
+    CmdArgs.push_back("-relaxed-aliasing");
+  if (!Args.hasFlag(options::OPT_fstruct_path_tbaa,
+                    options::OPT_fno_struct_path_tbaa, true))
+    CmdArgs.push_back("-no-struct-path-tbaa");
+  Args.addOptInFlag(CmdArgs, options::OPT_fstrict_enums,
+                    options::OPT_fno_strict_enums);
+  Args.addOptOutFlag(CmdArgs, options::OPT_fstrict_return,
+                     options::OPT_fno_strict_return);
+  Args.addOptInFlag(CmdArgs, options::OPT_fallow_editor_placeholders,
+                    options::OPT_fno_allow_editor_placeholders);
+  Args.addOptInFlag(CmdArgs, options::OPT_fstrict_vtable_pointers,
+                    options::OPT_fno_strict_vtable_pointers);
+  Args.addOptInFlag(CmdArgs, options::OPT_fforce_emit_vtables,
+                    options::OPT_fno_force_emit_vtables);
+  Args.addOptOutFlag(CmdArgs, options::OPT_foptimize_sibling_calls,
+                     options::OPT_fno_optimize_sibling_calls);
+  Args.addOptOutFlag(CmdArgs, options::OPT_fescaping_block_tail_calls,
+                     options::OPT_fno_escaping_block_tail_calls);
+
+  Args.AddLastArg(CmdArgs, options::OPT_ffine_grained_bitfield_accesses,
+                  options::OPT_fno_fine_grained_bitfield_accesses);
+
+  Args.AddLastArg(CmdArgs, options::OPT_fexperimental_relative_cxx_abi_vtables,
+                  options::OPT_fno_experimental_relative_cxx_abi_vtables);
+
+  // Handle segmented stacks.
+  Args.addOptInFlag(CmdArgs, options::OPT_fsplit_stack,
+                    options::OPT_fno_split_stack);
+
+  // -fprotect-parens=0 is default.
+  if (Args.hasFlag(options::OPT_fprotect_parens,
+                   options::OPT_fno_protect_parens, false))
+    CmdArgs.push_back("-fprotect-parens");
+
+  RenderFloatingPointOptions(TC, D, OFastEnabled, Args, CmdArgs, JA);
+
+  if (Arg *A = Args.getLastArg(options::OPT_fextend_args_EQ)) {
+    const llvm::Triple::ArchType Arch = TC.getArch();
+    if (Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64) {
+      StringRef V = A->getValue();
+      if (V == "64")
+        CmdArgs.push_back("-fextend-arguments=64");
+      else if (V != "32")
+        D.Diag(diag::err_drv_invalid_argument_to_option)
+            << A->getValue() << A->getOption().getName();
+    } else
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getOption().getName() << TripleStr;
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_mdouble_EQ)) {
+    if (TC.getArch() == llvm::Triple::avr)
+      A->render(Args, CmdArgs);
+    else
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getAsString(Args) << TripleStr;
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_LongDouble_Group)) {
+    if (TC.getTriple().isX86())
+      A->render(Args, CmdArgs);
+    else if (TC.getTriple().isPPC() &&
+             (A->getOption().getID() != options::OPT_mlong_double_80))
+      A->render(Args, CmdArgs);
+    else
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getAsString(Args) << TripleStr;
+  }
+
+  // Decide whether to use verbose asm. Verbose assembly is the default on
+  // toolchains which have the integrated assembler on by default.
+  bool IsIntegratedAssemblerDefault = TC.IsIntegratedAssemblerDefault();
+  if (!Args.hasFlag(options::OPT_fverbose_asm, options::OPT_fno_verbose_asm,
+                    IsIntegratedAssemblerDefault))
+    CmdArgs.push_back("-fno-verbose-asm");
+
+  // Parse 'none' or '$major.$minor'. Disallow -fbinutils-version=0 because we
+  // use that to indicate the MC default in the backend.
+  if (Arg *A = Args.getLastArg(options::OPT_fbinutils_version_EQ)) {
+    StringRef V = A->getValue();
+    unsigned Num;
+    if (V == "none")
+      A->render(Args, CmdArgs);
+    else if (!V.consumeInteger(10, Num) && Num > 0 &&
+             (V.empty() || (V.consume_front(".") &&
+                            !V.consumeInteger(10, Num) && V.empty())))
+      A->render(Args, CmdArgs);
+    else
+      D.Diag(diag::err_drv_invalid_argument_to_option)
+          << A->getValue() << A->getOption().getName();
+  }
+
+  // If toolchain choose to use MCAsmParser for inline asm don't pass the
+  // option to disable integrated-as explictly.
+  if (!TC.useIntegratedAs() && !TC.parseInlineAsmUsingAsmParser())
+    CmdArgs.push_back("-no-integrated-as");
+
+  if (Args.hasArg(options::OPT_fdebug_pass_structure)) {
+    CmdArgs.push_back("-mdebug-pass");
+    CmdArgs.push_back("Structure");
+  }
+  if (Args.hasArg(options::OPT_fdebug_pass_arguments)) {
+    CmdArgs.push_back("-mdebug-pass");
+    CmdArgs.push_back("Arguments");
+  }
+
+  // Enable -mconstructor-aliases except on darwin, where we have to work around
+  // a linker bug (see <rdar://problem/7651567>), and CUDA device code, where
+  // aliases aren't supported.
+  if (!RawTriple.isOSDarwin() && !RawTriple.isNVPTX())
+    CmdArgs.push_back("-mconstructor-aliases");
+
+  // Darwin's kernel doesn't support guard variables; just die if we
+  // try to use them.
+  if (KernelOrKext && RawTriple.isOSDarwin())
+    CmdArgs.push_back("-fforbid-guard-variables");
+
+  if (Args.hasFlag(options::OPT_mms_bitfields, options::OPT_mno_ms_bitfields,
+                   Triple.isWindowsGNUEnvironment())) {
+    CmdArgs.push_back("-mms-bitfields");
+  }
+
+  // Non-PIC code defaults to -fdirect-access-external-data while PIC code
+  // defaults to -fno-direct-access-external-data. Pass the option if different
+  // from the default.
+  if (Arg *A = Args.getLastArg(options::OPT_fdirect_access_external_data,
+                               options::OPT_fno_direct_access_external_data))
+    if (A->getOption().matches(options::OPT_fdirect_access_external_data) !=
+        (PICLevel == 0))
+      A->render(Args, CmdArgs);
+
+  if (Args.hasFlag(options::OPT_fno_plt, options::OPT_fplt, false)) {
+    CmdArgs.push_back("-fno-plt");
+  }
+
+  // -fhosted is default.
+  // TODO: Audit uses of KernelOrKext and see where it'd be more appropriate to
+  // use Freestanding.
+  bool Freestanding =
+      Args.hasFlag(options::OPT_ffreestanding, options::OPT_fhosted, false) ||
+      KernelOrKext;
+  if (Freestanding)
+    CmdArgs.push_back("-ffreestanding");
+
+  Args.AddLastArg(CmdArgs, options::OPT_fno_knr_functions);
+
+  // This is a coarse approximation of what llvm-gcc actually does, both
+  // -fasynchronous-unwind-tables and -fnon-call-exceptions interact in more
+  // complicated ways.
+  auto SanitizeArgs = TC.getSanitizerArgs(Args);
+
+  bool IsAsyncUnwindTablesDefault =
+      TC.getDefaultUnwindTableLevel(Args) == ToolChain::UnwindTableLevel::Asynchronous;
+  bool IsSyncUnwindTablesDefault =
+      TC.getDefaultUnwindTableLevel(Args) == ToolChain::UnwindTableLevel::Synchronous;
+
+  bool AsyncUnwindTables = Args.hasFlag(
+      options::OPT_fasynchronous_unwind_tables,
+      options::OPT_fno_asynchronous_unwind_tables,
+      (IsAsyncUnwindTablesDefault || SanitizeArgs.needsUnwindTables()) &&
+          !Freestanding);
+  bool UnwindTables =
+      Args.hasFlag(options::OPT_funwind_tables, options::OPT_fno_unwind_tables,
+                   IsSyncUnwindTablesDefault && !Freestanding);
+  if (AsyncUnwindTables)
+    CmdArgs.push_back("-funwind-tables=2");
+  else if (UnwindTables)
+     CmdArgs.push_back("-funwind-tables=1");
+
+  // Prepare `-aux-target-cpu` and `-aux-target-feature` unless
+  // `--gpu-use-aux-triple-only` is specified.
+  if (!Args.getLastArg(options::OPT_gpu_use_aux_triple_only) &&
+      (IsCudaDevice || IsHIPDevice)) {
+    const ArgList &HostArgs =
+        C.getArgsForToolChain(nullptr, StringRef(), Action::OFK_None);
+    std::string HostCPU =
+        getCPUName(D, HostArgs, *TC.getAuxTriple(), /*FromAs*/ false);
+    if (!HostCPU.empty()) {
+      CmdArgs.push_back("-aux-target-cpu");
+      CmdArgs.push_back(Args.MakeArgString(HostCPU));
+    }
+    getTargetFeatures(D, *TC.getAuxTriple(), HostArgs, CmdArgs,
+                      /*ForAS*/ false, /*IsAux*/ true);
+  }
+
+  TC.addClangTargetOptions(Args, CmdArgs, JA.getOffloadingDeviceKind());
+
+  if (Arg *A = Args.getLastArg(options::OPT_mcmodel_EQ)) {
+    StringRef CM = A->getValue();
+    if (CM == "small" || CM == "kernel" || CM == "medium" || CM == "large" ||
+        CM == "tiny") {
+      if (Triple.isOSAIX() && CM == "medium")
+        CmdArgs.push_back("-mcmodel=large");
+      else if (Triple.isAArch64() && (CM == "kernel" || CM == "medium"))
+        D.Diag(diag::err_drv_invalid_argument_to_option)
+            << CM << A->getOption().getName();
+      else
+        A->render(Args, CmdArgs);
+    } else {
+      D.Diag(diag::err_drv_invalid_argument_to_option)
+          << CM << A->getOption().getName();
+    }
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_mtls_size_EQ)) {
+    StringRef Value = A->getValue();
+    unsigned TLSSize = 0;
+    Value.getAsInteger(10, TLSSize);
+    if (!Triple.isAArch64() || !Triple.isOSBinFormatELF())
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getOption().getName() << TripleStr;
+    if (TLSSize != 12 && TLSSize != 24 && TLSSize != 32 && TLSSize != 48)
+      D.Diag(diag::err_drv_invalid_int_value)
+          << A->getOption().getName() << Value;
+    Args.AddLastArg(CmdArgs, options::OPT_mtls_size_EQ);
+  }
+
+  // Add the target cpu
+  std::string CPU = getCPUName(D, Args, Triple, /*FromAs*/ false);
+  if (!CPU.empty()) {
+    CmdArgs.push_back("-target-cpu");
+    CmdArgs.push_back(Args.MakeArgString(CPU));
+  }
+
+  RenderTargetOptions(Triple, Args, KernelOrKext, CmdArgs);
+
+  // FIXME: For now we want to demote any errors to warnings, when they have
+  // been raised for asking the wrong question of scalable vectors, such as
+  // asking for the fixed number of elements. This may happen because code that
+  // is not yet ported to work for scalable vectors uses the wrong interfaces,
+  // whereas the behaviour is actually correct. Emitting a warning helps bring
+  // up scalable vector support in an incremental way. When scalable vector
+  // support is stable enough, all uses of wrong interfaces should be considered
+  // as errors, but until then, we can live with a warning being emitted by the
+  // compiler. This way, Clang can be used to compile code with scalable vectors
+  // and identify possible issues.
+  if (isa<AssembleJobAction>(JA) || isa<CompileJobAction>(JA) ||
+      isa<BackendJobAction>(JA)) {
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back("-treat-scalable-fixed-error-as-warning");
+  }
+
+  // These two are potentially updated by AddClangCLArgs.
+  codegenoptions::DebugInfoKind DebugInfoKind = codegenoptions::NoDebugInfo;
+  bool EmitCodeView = false;
+
+  // Add clang-cl arguments.
+  types::ID InputType = Input.getType();
+  if (D.IsCLMode())
+    AddClangCLArgs(Args, InputType, CmdArgs, &DebugInfoKind, &EmitCodeView);
+
+  DwarfFissionKind DwarfFission = DwarfFissionKind::None;
+  renderDebugOptions(TC, D, RawTriple, Args, EmitCodeView,
+                     types::isLLVMIR(InputType), CmdArgs, DebugInfoKind,
+                     DwarfFission);
+
+  // This controls whether or not we perform JustMyCode instrumentation.
+  if (Args.hasFlag(options::OPT_fjmc, options::OPT_fno_jmc, false)) {
+    if (TC.getTriple().isOSBinFormatELF()) {
+      if (DebugInfoKind >= codegenoptions::DebugInfoConstructor)
+        CmdArgs.push_back("-fjmc");
+      else
+        D.Diag(clang::diag::warn_drv_jmc_requires_debuginfo) << "-fjmc"
+                                                             << "-g";
+    } else {
+      D.Diag(clang::diag::warn_drv_fjmc_for_elf_only);
+    }
+  }
+
+  // Add the split debug info name to the command lines here so we
+  // can propagate it to the backend.
+  bool SplitDWARF = (DwarfFission != DwarfFissionKind::None) &&
+                    (TC.getTriple().isOSBinFormatELF() ||
+                     TC.getTriple().isOSBinFormatWasm()) &&
+                    (isa<AssembleJobAction>(JA) || isa<CompileJobAction>(JA) ||
+                     isa<BackendJobAction>(JA));
+  if (SplitDWARF) {
+    const char *SplitDWARFOut = SplitDebugName(JA, Args, Input, Output);
+    CmdArgs.push_back("-split-dwarf-file");
+    CmdArgs.push_back(SplitDWARFOut);
+    if (DwarfFission == DwarfFissionKind::Split) {
+      CmdArgs.push_back("-split-dwarf-output");
+      CmdArgs.push_back(SplitDWARFOut);
+    }
+  }
+
+  // Pass the linker version in use.
+  if (Arg *A = Args.getLastArg(options::OPT_mlinker_version_EQ)) {
+    CmdArgs.push_back("-target-linker-version");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  // Explicitly error on some things we know we don't support and can't just
+  // ignore.
+  if (!Args.hasArg(options::OPT_fallow_unsupported)) {
+    Arg *Unsupported;
+    if (types::isCXX(InputType) && RawTriple.isOSDarwin() &&
+        TC.getArch() == llvm::Triple::x86) {
+      if ((Unsupported = Args.getLastArg(options::OPT_fapple_kext)) ||
+          (Unsupported = Args.getLastArg(options::OPT_mkernel)))
+        D.Diag(diag::err_drv_clang_unsupported_opt_cxx_darwin_i386)
+            << Unsupported->getOption().getName();
+    }
+    // The faltivec option has been superseded by the maltivec option.
+    if ((Unsupported = Args.getLastArg(options::OPT_faltivec)))
+      D.Diag(diag::err_drv_clang_unsupported_opt_faltivec)
+          << Unsupported->getOption().getName()
+          << "please use -maltivec and include altivec.h explicitly";
+    if ((Unsupported = Args.getLastArg(options::OPT_fno_altivec)))
+      D.Diag(diag::err_drv_clang_unsupported_opt_faltivec)
+          << Unsupported->getOption().getName() << "please use -mno-altivec";
+  }
+
+  Args.AddAllArgs(CmdArgs, options::OPT_v);
+
+  if (Args.getLastArg(options::OPT_H)) {
+    CmdArgs.push_back("-H");
+    CmdArgs.push_back("-sys-header-deps");
+  }
+  Args.AddAllArgs(CmdArgs, options::OPT_fshow_skipped_includes);
+
+  if (D.CCPrintHeadersFormat && !D.CCGenDiagnostics) {
+    CmdArgs.push_back("-header-include-file");
+    CmdArgs.push_back(!D.CCPrintHeadersFilename.empty()
+                          ? D.CCPrintHeadersFilename.c_str()
+                          : "-");
+    CmdArgs.push_back("-sys-header-deps");
+    CmdArgs.push_back(Args.MakeArgString(
+        "-header-include-format=" +
+        std::string(headerIncludeFormatKindToString(D.CCPrintHeadersFormat))));
+    CmdArgs.push_back(
+        Args.MakeArgString("-header-include-filtering=" +
+                           std::string(headerIncludeFilteringKindToString(
+                               D.CCPrintHeadersFiltering))));
+  }
+  Args.AddLastArg(CmdArgs, options::OPT_P);
+  Args.AddLastArg(CmdArgs, options::OPT_print_ivar_layout);
+
+  if (D.CCLogDiagnostics && !D.CCGenDiagnostics) {
+    CmdArgs.push_back("-diagnostic-log-file");
+    CmdArgs.push_back(!D.CCLogDiagnosticsFilename.empty()
+                          ? D.CCLogDiagnosticsFilename.c_str()
+                          : "-");
+  }
+
+  // Give the gen diagnostics more chances to succeed, by avoiding intentional
+  // crashes.
+  if (D.CCGenDiagnostics)
+    CmdArgs.push_back("-disable-pragma-debug-crash");
+
+  // Allow backend to put its diagnostic files in the same place as frontend
+  // crash diagnostics files.
+  if (Args.hasArg(options::OPT_fcrash_diagnostics_dir)) {
+    StringRef Dir = Args.getLastArgValue(options::OPT_fcrash_diagnostics_dir);
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back(Args.MakeArgString("-crash-diagnostics-dir=" + Dir));
+  }
+
+  bool UseSeparateSections = isUseSeparateSections(Triple);
+
+  if (Args.hasFlag(options::OPT_ffunction_sections,
+                   options::OPT_fno_function_sections, UseSeparateSections)) {
+    CmdArgs.push_back("-ffunction-sections");
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_fbasic_block_sections_EQ)) {
+    StringRef Val = A->getValue();
+    if (Triple.isX86() && Triple.isOSBinFormatELF()) {
+      if (Val != "all" && Val != "labels" && Val != "none" &&
+          !Val.startswith("list="))
+        D.Diag(diag::err_drv_invalid_value)
+            << A->getAsString(Args) << A->getValue();
+      else
+        A->render(Args, CmdArgs);
+    } else if (Triple.isNVPTX()) {
+      // Do not pass the option to the GPU compilation. We still want it enabled
+      // for the host-side compilation, so seeing it here is not an error.
+    } else if (Val != "none") {
+      // =none is allowed everywhere. It's useful for overriding the option
+      // and is the same as not specifying the option.
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getAsString(Args) << TripleStr;
+    }
+  }
+
+  bool HasDefaultDataSections = Triple.isOSBinFormatXCOFF();
+  if (Args.hasFlag(options::OPT_fdata_sections, options::OPT_fno_data_sections,
+                   UseSeparateSections || HasDefaultDataSections)) {
+    CmdArgs.push_back("-fdata-sections");
+  }
+
+  Args.addOptOutFlag(CmdArgs, options::OPT_funique_section_names,
+                     options::OPT_fno_unique_section_names);
+  Args.addOptInFlag(CmdArgs, options::OPT_funique_internal_linkage_names,
+                    options::OPT_fno_unique_internal_linkage_names);
+  Args.addOptInFlag(CmdArgs, options::OPT_funique_basic_block_section_names,
+                    options::OPT_fno_unique_basic_block_section_names);
+
+  if (Arg *A = Args.getLastArg(options::OPT_fsplit_machine_functions,
+                               options::OPT_fno_split_machine_functions)) {
+    // This codegen pass is only available on x86-elf targets.
+    if (Triple.isX86() && Triple.isOSBinFormatELF()) {
+      if (A->getOption().matches(options::OPT_fsplit_machine_functions))
+        A->render(Args, CmdArgs);
+    } else {
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getAsString(Args) << TripleStr;
+    }
+  }
+
+  Args.AddLastArg(CmdArgs, options::OPT_finstrument_functions,
+                  options::OPT_finstrument_functions_after_inlining,
+                  options::OPT_finstrument_function_entry_bare);
+
+  // NVPTX/AMDGCN doesn't support PGO or coverage. There's no runtime support
+  // for sampling, overhead of call arc collection is way too high and there's
+  // no way to collect the output.
+  if (!Triple.isNVPTX() && !Triple.isAMDGCN())
+    addPGOAndCoverageFlags(TC, C, D, Output, Args, SanitizeArgs, CmdArgs);
+
+  Args.AddLastArg(CmdArgs, options::OPT_fclang_abi_compat_EQ);
+
+  if (getLastProfileSampleUseArg(Args) &&
+      Args.hasArg(options::OPT_fsample_profile_use_profi)) {
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back("-sample-profile-use-profi");
+  }
+
+  // Add runtime flag for PS4/PS5 when PGO, coverage, or sanitizers are enabled.
+  if (RawTriple.isPS() &&
+      !Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
+    PScpu::addProfileRTArgs(TC, Args, CmdArgs);
+    PScpu::addSanitizerArgs(TC, Args, CmdArgs);
+  }
+
+  // Pass options for controlling the default header search paths.
+  if (Args.hasArg(options::OPT_nostdinc)) {
+    CmdArgs.push_back("-nostdsysteminc");
+    CmdArgs.push_back("-nobuiltininc");
+  } else {
+    if (Args.hasArg(options::OPT_nostdlibinc))
+      CmdArgs.push_back("-nostdsysteminc");
+    Args.AddLastArg(CmdArgs, options::OPT_nostdincxx);
+    Args.AddLastArg(CmdArgs, options::OPT_nobuiltininc);
+  }
+
+  // Pass the path to compiler resource files.
+  CmdArgs.push_back("-resource-dir");
+  CmdArgs.push_back(D.ResourceDir.c_str());
+
+  Args.AddLastArg(CmdArgs, options::OPT_working_directory);
+
+  RenderARCMigrateToolOptions(D, Args, CmdArgs);
+
+  // Add preprocessing options like -I, -D, etc. if we are using the
+  // preprocessor.
+  //
+  // FIXME: Support -fpreprocessed
+  if (types::getPreprocessedType(InputType) != types::TY_INVALID)
+    AddPreprocessingOptions(C, JA, D, Args, CmdArgs, Output, Inputs);
+
+  // Don't warn about "clang -c -DPIC -fPIC test.i" because libtool.m4 assumes
+  // that "The compiler can only warn and ignore the option if not recognized".
+  // When building with ccache, it will pass -D options to clang even on
+  // preprocessed inputs and configure concludes that -fPIC is not supported.
+  Args.ClaimAllArgs(options::OPT_D);
+
+  // Manually translate -O4 to -O3; let clang reject others.
+  if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
+    if (A->getOption().matches(options::OPT_O4)) {
+      CmdArgs.push_back("-O3");
+      D.Diag(diag::warn_O4_is_O3);
+    } else {
+      A->render(Args, CmdArgs);
+    }
+  }
+
+  // Warn about ignored options to clang.
+  for (const Arg *A :
+       Args.filtered(options::OPT_clang_ignored_gcc_optimization_f_Group)) {
+    D.Diag(diag::warn_ignored_gcc_optimization) << A->getAsString(Args);
+    A->claim();
+  }
+
+  for (const Arg *A :
+       Args.filtered(options::OPT_clang_ignored_legacy_options_Group)) {
+    D.Diag(diag::warn_ignored_clang_option) << A->getAsString(Args);
+    A->claim();
+  }
+
+  claimNoWarnArgs(Args);
+
+  Args.AddAllArgs(CmdArgs, options::OPT_R_Group);
+
+  for (const Arg *A :
+       Args.filtered(options::OPT_W_Group, options::OPT__SLASH_wd)) {
+    A->claim();
+    if (A->getOption().getID() == options::OPT__SLASH_wd) {
+      unsigned WarningNumber;
+      if (StringRef(A->getValue()).getAsInteger(10, WarningNumber)) {
+        D.Diag(diag::err_drv_invalid_int_value)
+            << A->getAsString(Args) << A->getValue();
+        continue;
+      }
+
+      if (auto Group = diagGroupFromCLWarningID(WarningNumber)) {
+        CmdArgs.push_back(Args.MakeArgString(
+            "-Wno-" + DiagnosticIDs::getWarningOptionForGroup(*Group)));
+      }
+      continue;
+    }
+    A->render(Args, CmdArgs);
+  }
+
+  if (Args.hasFlag(options::OPT_pedantic, options::OPT_no_pedantic, false))
+    CmdArgs.push_back("-pedantic");
+  Args.AddLastArg(CmdArgs, options::OPT_pedantic_errors);
+  Args.AddLastArg(CmdArgs, options::OPT_w);
+
+  Args.addOptInFlag(CmdArgs, options::OPT_ffixed_point,
+                    options::OPT_fno_fixed_point);
+
+  if (Arg *A = Args.getLastArg(options::OPT_fcxx_abi_EQ))
+    A->render(Args, CmdArgs);
+
+  Args.AddLastArg(CmdArgs, options::OPT_fexperimental_relative_cxx_abi_vtables,
+                  options::OPT_fno_experimental_relative_cxx_abi_vtables);
+
+  if (Arg *A = Args.getLastArg(options::OPT_ffuchsia_api_level_EQ))
+    A->render(Args, CmdArgs);
+
+  // Handle -{std, ansi, trigraphs} -- take the last of -{std, ansi}
+  // (-ansi is equivalent to -std=c89 or -std=c++98).
+  //
+  // If a std is supplied, only add -trigraphs if it follows the
+  // option.
+  bool ImplyVCPPCVer = false;
+  bool ImplyVCPPCXXVer = false;
+  const Arg *Std = Args.getLastArg(options::OPT_std_EQ, options::OPT_ansi);
+  if (Std) {
+    if (Std->getOption().matches(options::OPT_ansi))
+      if (types::isCXX(InputType))
+        CmdArgs.push_back("-std=c++98");
+      else
+        CmdArgs.push_back("-std=c89");
+    else
+      Std->render(Args, CmdArgs);
+
+    // If -f(no-)trigraphs appears after the language standard flag, honor it.
+    if (Arg *A = Args.getLastArg(options::OPT_std_EQ, options::OPT_ansi,
+                                 options::OPT_ftrigraphs,
+                                 options::OPT_fno_trigraphs))
+      if (A != Std)
+        A->render(Args, CmdArgs);
+  } else {
+    // Honor -std-default.
+    //
+    // FIXME: Clang doesn't correctly handle -std= when the input language
+    // doesn't match. For the time being just ignore this for C++ inputs;
+    // eventually we want to do all the standard defaulting here instead of
+    // splitting it between the driver and clang -cc1.
+    if (!types::isCXX(InputType)) {
+      if (!Args.hasArg(options::OPT__SLASH_std)) {
+        Args.AddAllArgsTranslated(CmdArgs, options::OPT_std_default_EQ, "-std=",
+                                  /*Joined=*/true);
+      } else
+        ImplyVCPPCVer = true;
+    }
+    else if (IsWindowsMSVC)
+      ImplyVCPPCXXVer = true;
+
+    Args.AddLastArg(CmdArgs, options::OPT_ftrigraphs,
+                    options::OPT_fno_trigraphs);
+  }
+
+  // GCC's behavior for -Wwrite-strings is a bit strange:
+  //  * In C, this "warning flag" changes the types of string literals from
+  //    'char[N]' to 'const char[N]', and thus triggers an unrelated warning
+  //    for the discarded qualifier.
+  //  * In C++, this is just a normal warning flag.
+  //
+  // Implementing this warning correctly in C is hard, so we follow GCC's
+  // behavior for now. FIXME: Directly diagnose uses of a string literal as
+  // a non-const char* in C, rather than using this crude hack.
+  if (!types::isCXX(InputType)) {
+    // FIXME: This should behave just like a warning flag, and thus should also
+    // respect -Weverything, -Wno-everything, -Werror=write-strings, and so on.
+    Arg *WriteStrings =
+        Args.getLastArg(options::OPT_Wwrite_strings,
+                        options::OPT_Wno_write_strings, options::OPT_w);
+    if (WriteStrings &&
+        WriteStrings->getOption().matches(options::OPT_Wwrite_strings))
+      CmdArgs.push_back("-fconst-strings");
+  }
+
+  // GCC provides a macro definition '__DEPRECATED' when -Wdeprecated is active
+  // during C++ compilation, which it is by default. GCC keeps this define even
+  // in the presence of '-w', match this behavior bug-for-bug.
+  if (types::isCXX(InputType) &&
+      Args.hasFlag(options::OPT_Wdeprecated, options::OPT_Wno_deprecated,
+                   true)) {
+    CmdArgs.push_back("-fdeprecated-macro");
+  }
+
+  // Translate GCC's misnamer '-fasm' arguments to '-fgnu-keywords'.
+  if (Arg *Asm = Args.getLastArg(options::OPT_fasm, options::OPT_fno_asm)) {
+    if (Asm->getOption().matches(options::OPT_fasm))
+      CmdArgs.push_back("-fgnu-keywords");
+    else
+      CmdArgs.push_back("-fno-gnu-keywords");
+  }
+
+  if (!ShouldEnableAutolink(Args, TC, JA))
+    CmdArgs.push_back("-fno-autolink");
+
+  // Add in -fdebug-compilation-dir if necessary.
+  const char *DebugCompilationDir =
+      addDebugCompDirArg(Args, CmdArgs, D.getVFS());
+
+  addDebugPrefixMapArg(D, TC, Args, CmdArgs);
+
+  if (Arg *A = Args.getLastArg(options::OPT_ftemplate_depth_,
+                               options::OPT_ftemplate_depth_EQ)) {
+    CmdArgs.push_back("-ftemplate-depth");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_foperator_arrow_depth_EQ)) {
+    CmdArgs.push_back("-foperator-arrow-depth");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_fconstexpr_depth_EQ)) {
+    CmdArgs.push_back("-fconstexpr-depth");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_fconstexpr_steps_EQ)) {
+    CmdArgs.push_back("-fconstexpr-steps");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  Args.AddLastArg(CmdArgs, options::OPT_fexperimental_library);
+
+  if (Args.hasArg(options::OPT_fexperimental_new_constant_interpreter))
+    CmdArgs.push_back("-fexperimental-new-constant-interpreter");
+
+  if (Arg *A = Args.getLastArg(options::OPT_fbracket_depth_EQ)) {
+    CmdArgs.push_back("-fbracket-depth");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_Wlarge_by_value_copy_EQ,
+                               options::OPT_Wlarge_by_value_copy_def)) {
+    if (A->getNumValues()) {
+      StringRef bytes = A->getValue();
+      CmdArgs.push_back(Args.MakeArgString("-Wlarge-by-value-copy=" + bytes));
+    } else
+      CmdArgs.push_back("-Wlarge-by-value-copy=64"); // default value
+  }
+
+  if (Args.hasArg(options::OPT_relocatable_pch))
+    CmdArgs.push_back("-relocatable-pch");
+
+  if (const Arg *A = Args.getLastArg(options::OPT_fcf_runtime_abi_EQ)) {
+    static const char *kCFABIs[] = {
+      "standalone", "objc", "swift", "swift-5.0", "swift-4.2", "swift-4.1",
+    };
+
+    if (!llvm::is_contained(kCFABIs, StringRef(A->getValue())))
+      D.Diag(diag::err_drv_invalid_cf_runtime_abi) << A->getValue();
+    else
+      A->render(Args, CmdArgs);
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_fconstant_string_class_EQ)) {
+    CmdArgs.push_back("-fconstant-string-class");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_ftabstop_EQ)) {
+    CmdArgs.push_back("-ftabstop");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  Args.addOptInFlag(CmdArgs, options::OPT_fstack_size_section,
+                    options::OPT_fno_stack_size_section);
+
+  if (Args.hasArg(options::OPT_fstack_usage)) {
+    CmdArgs.push_back("-stack-usage-file");
+
+    if (Arg *OutputOpt = Args.getLastArg(options::OPT_o)) {
+      SmallString<128> OutputFilename(OutputOpt->getValue());
+      llvm::sys::path::replace_extension(OutputFilename, "su");
+      CmdArgs.push_back(Args.MakeArgString(OutputFilename));
+    } else
+      CmdArgs.push_back(
+          Args.MakeArgString(Twine(getBaseInputStem(Args, Inputs)) + ".su"));
+  }
+
+  CmdArgs.push_back("-ferror-limit");
+  if (Arg *A = Args.getLastArg(options::OPT_ferror_limit_EQ))
+    CmdArgs.push_back(A->getValue());
+  else
+    CmdArgs.push_back("19");
+
+  if (Arg *A = Args.getLastArg(options::OPT_fmacro_backtrace_limit_EQ)) {
+    CmdArgs.push_back("-fmacro-backtrace-limit");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_ftemplate_backtrace_limit_EQ)) {
+    CmdArgs.push_back("-ftemplate-backtrace-limit");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_fconstexpr_backtrace_limit_EQ)) {
+    CmdArgs.push_back("-fconstexpr-backtrace-limit");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_fspell_checking_limit_EQ)) {
+    CmdArgs.push_back("-fspell-checking-limit");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  // Pass -fmessage-length=.
+  unsigned MessageLength = 0;
+  if (Arg *A = Args.getLastArg(options::OPT_fmessage_length_EQ)) {
+    StringRef V(A->getValue());
+    if (V.getAsInteger(0, MessageLength))
+      D.Diag(diag::err_drv_invalid_argument_to_option)
+          << V << A->getOption().getName();
+  } else {
+    // If -fmessage-length=N was not specified, determine whether this is a
+    // terminal and, if so, implicitly define -fmessage-length appropriately.
+    MessageLength = llvm::sys::Process::StandardErrColumns();
+  }
+  if (MessageLength != 0)
+    CmdArgs.push_back(
+        Args.MakeArgString("-fmessage-length=" + Twine(MessageLength)));
+
+  if (Arg *A = Args.getLastArg(options::OPT_frandomize_layout_seed_EQ))
+    CmdArgs.push_back(
+        Args.MakeArgString("-frandomize-layout-seed=" + Twine(A->getValue(0))));
+
+  if (Arg *A = Args.getLastArg(options::OPT_frandomize_layout_seed_file_EQ))
+    CmdArgs.push_back(Args.MakeArgString("-frandomize-layout-seed-file=" +
+                                         Twine(A->getValue(0))));
+
+  // -fvisibility= and -fvisibility-ms-compat are of a piece.
+  if (const Arg *A = Args.getLastArg(options::OPT_fvisibility_EQ,
+                                     options::OPT_fvisibility_ms_compat)) {
+    if (A->getOption().matches(options::OPT_fvisibility_EQ)) {
+      A->render(Args, CmdArgs);
+    } else {
+      assert(A->getOption().matches(options::OPT_fvisibility_ms_compat));
+      CmdArgs.push_back("-fvisibility=hidden");
+      CmdArgs.push_back("-ftype-visibility=default");
+    }
+  } else if (IsOpenMPDevice) {
+    // When compiling for the OpenMP device we want protected visibility by
+    // default. This prevents the device from accidentally preempting code on
+    // the host, makes the system more robust, and improves performance.
+    CmdArgs.push_back("-fvisibility=protected");
+  }
+
+  // PS4/PS5 process these options in addClangTargetOptions.
+  if (!RawTriple.isPS()) {
+    if (const Arg *A =
+            Args.getLastArg(options::OPT_fvisibility_from_dllstorageclass,
+                            options::OPT_fno_visibility_from_dllstorageclass)) {
+      if (A->getOption().matches(
+              options::OPT_fvisibility_from_dllstorageclass)) {
+        CmdArgs.push_back("-fvisibility-from-dllstorageclass");
+        Args.AddLastArg(CmdArgs, options::OPT_fvisibility_dllexport_EQ);
+        Args.AddLastArg(CmdArgs, options::OPT_fvisibility_nodllstorageclass_EQ);
+        Args.AddLastArg(CmdArgs, options::OPT_fvisibility_externs_dllimport_EQ);
+        Args.AddLastArg(CmdArgs,
+                        options::OPT_fvisibility_externs_nodllstorageclass_EQ);
+      }
+    }
+  }
+
+  if (const Arg *A = Args.getLastArg(options::OPT_mignore_xcoff_visibility)) {
+    if (Triple.isOSAIX())
+      CmdArgs.push_back("-mignore-xcoff-visibility");
+    else
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getAsString(Args) << TripleStr;
+  }
+
+  if (const Arg *A =
+          Args.getLastArg(options::OPT_mdefault_visibility_export_mapping_EQ)) {
+    if (Triple.isOSAIX())
+      A->render(Args, CmdArgs);
+    else
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getAsString(Args) << TripleStr;
+  }
+
+  if (Args.hasFlag(options::OPT_fvisibility_inlines_hidden,
+                    options::OPT_fno_visibility_inlines_hidden, false))
+    CmdArgs.push_back("-fvisibility-inlines-hidden");
+
+  Args.AddLastArg(CmdArgs, options::OPT_fvisibility_inlines_hidden_static_local_var,
+                           options::OPT_fno_visibility_inlines_hidden_static_local_var);
+  Args.AddLastArg(CmdArgs, options::OPT_fvisibility_global_new_delete_hidden);
+  Args.AddLastArg(CmdArgs, options::OPT_ftlsmodel_EQ);
+
+  if (Args.hasFlag(options::OPT_fnew_infallible,
+                   options::OPT_fno_new_infallible, false))
+    CmdArgs.push_back("-fnew-infallible");
+
+  if (Args.hasFlag(options::OPT_fno_operator_names,
+                   options::OPT_foperator_names, false))
+    CmdArgs.push_back("-fno-operator-names");
+
+  // Forward -f (flag) options which we can pass directly.
+  Args.AddLastArg(CmdArgs, options::OPT_femit_all_decls);
+  Args.AddLastArg(CmdArgs, options::OPT_fheinous_gnu_extensions);
+  Args.AddLastArg(CmdArgs, options::OPT_fdigraphs, options::OPT_fno_digraphs);
+  Args.AddLastArg(CmdArgs, options::OPT_femulated_tls,
+                  options::OPT_fno_emulated_tls);
+  Args.AddLastArg(CmdArgs, options::OPT_fzero_call_used_regs_EQ);
+
+  if (Arg *A = Args.getLastArg(options::OPT_fzero_call_used_regs_EQ)) {
+    // FIXME: There's no reason for this to be restricted to X86. The backend
+    // code needs to be changed to include the appropriate function calls
+    // automatically.
+    if (!Triple.isX86() && !Triple.isAArch64())
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getAsString(Args) << TripleStr;
+  }
+
+  // AltiVec-like language extensions aren't relevant for assembling.
+  if (!isa<PreprocessJobAction>(JA) || Output.getType() != types::TY_PP_Asm)
+    Args.AddLastArg(CmdArgs, options::OPT_fzvector);
+
+  Args.AddLastArg(CmdArgs, options::OPT_fdiagnostics_show_template_tree);
+  Args.AddLastArg(CmdArgs, options::OPT_fno_elide_type);
+
+  // Forward flags for OpenMP. We don't do this if the current action is an
+  // device offloading action other than OpenMP.
+  if (Args.hasFlag(options::OPT_fopenmp, options::OPT_fopenmp_EQ,
+                   options::OPT_fno_openmp, false) &&
+      (JA.isDeviceOffloading(Action::OFK_None) ||
+       JA.isDeviceOffloading(Action::OFK_OpenMP))) {
+    switch (D.getOpenMPRuntime(Args)) {
+    case Driver::OMPRT_OMP:
+    case Driver::OMPRT_IOMP5:
+      // Clang can generate useful OpenMP code for these two runtime libraries.
+      CmdArgs.push_back("-fopenmp");
+
+      // If no option regarding the use of TLS in OpenMP codegeneration is
+      // given, decide a default based on the target. Otherwise rely on the
+      // options and pass the right information to the frontend.
+      if (!Args.hasFlag(options::OPT_fopenmp_use_tls,
+                        options::OPT_fnoopenmp_use_tls, /*Default=*/true))
+        CmdArgs.push_back("-fnoopenmp-use-tls");
+      Args.AddLastArg(CmdArgs, options::OPT_fopenmp_simd,
+                      options::OPT_fno_openmp_simd);
+      Args.AddAllArgs(CmdArgs, options::OPT_fopenmp_enable_irbuilder);
+      Args.AddAllArgs(CmdArgs, options::OPT_fopenmp_version_EQ);
+      if (!Args.hasFlag(options::OPT_fopenmp_extensions,
+                        options::OPT_fno_openmp_extensions, /*Default=*/true))
+        CmdArgs.push_back("-fno-openmp-extensions");
+      Args.AddAllArgs(CmdArgs, options::OPT_fopenmp_cuda_number_of_sm_EQ);
+      Args.AddAllArgs(CmdArgs, options::OPT_fopenmp_cuda_blocks_per_sm_EQ);
+      Args.AddAllArgs(CmdArgs,
+                      options::OPT_fopenmp_cuda_teams_reduction_recs_num_EQ);
+      if (Args.hasFlag(options::OPT_fopenmp_optimistic_collapse,
+                       options::OPT_fno_openmp_optimistic_collapse,
+                       /*Default=*/false))
+        CmdArgs.push_back("-fopenmp-optimistic-collapse");
+
+      // When in OpenMP offloading mode with NVPTX target, forward
+      // cuda-mode flag
+      if (Args.hasFlag(options::OPT_fopenmp_cuda_mode,
+                       options::OPT_fno_openmp_cuda_mode, /*Default=*/false))
+        CmdArgs.push_back("-fopenmp-cuda-mode");
+
+      // When in OpenMP offloading mode, enable debugging on the device.
+      Args.AddAllArgs(CmdArgs, options::OPT_fopenmp_target_debug_EQ);
+      if (Args.hasFlag(options::OPT_fopenmp_target_debug,
+                       options::OPT_fno_openmp_target_debug, /*Default=*/false))
+        CmdArgs.push_back("-fopenmp-target-debug");
+
+      // When in OpenMP offloading mode, forward assumptions information about
+      // thread and team counts in the device.
+      if (Args.hasFlag(options::OPT_fopenmp_assume_teams_oversubscription,
+                       options::OPT_fno_openmp_assume_teams_oversubscription,
+                       /*Default=*/false))
+        CmdArgs.push_back("-fopenmp-assume-teams-oversubscription");
+      if (Args.hasFlag(options::OPT_fopenmp_assume_threads_oversubscription,
+                       options::OPT_fno_openmp_assume_threads_oversubscription,
+                       /*Default=*/false))
+        CmdArgs.push_back("-fopenmp-assume-threads-oversubscription");
+      if (Args.hasArg(options::OPT_fopenmp_assume_no_thread_state))
+        CmdArgs.push_back("-fopenmp-assume-no-thread-state");
+      if (Args.hasArg(options::OPT_fopenmp_assume_no_nested_parallelism))
+        CmdArgs.push_back("-fopenmp-assume-no-nested-parallelism");
+      if (Args.hasArg(options::OPT_fopenmp_offload_mandatory))
+        CmdArgs.push_back("-fopenmp-offload-mandatory");
+      break;
+    default:
+      // By default, if Clang doesn't know how to generate useful OpenMP code
+      // for a specific runtime library, we just don't pass the '-fopenmp' flag
+      // down to the actual compilation.
+      // FIXME: It would be better to have a mode which *only* omits IR
+      // generation based on the OpenMP support so that we get consistent
+      // semantic analysis, etc.
+      break;
+    }
+  } else {
+    Args.AddLastArg(CmdArgs, options::OPT_fopenmp_simd,
+                    options::OPT_fno_openmp_simd);
+    Args.AddAllArgs(CmdArgs, options::OPT_fopenmp_version_EQ);
+    Args.addOptOutFlag(CmdArgs, options::OPT_fopenmp_extensions,
+                       options::OPT_fno_openmp_extensions);
+  }
+
+  // Forward the new driver to change offloading code generation.
+  if (Args.hasFlag(options::OPT_offload_new_driver,
+                   options::OPT_no_offload_new_driver, false))
+    CmdArgs.push_back("--offload-new-driver");
+
+  SanitizeArgs.addArgs(TC, Args, CmdArgs, InputType);
+
+  const XRayArgs &XRay = TC.getXRayArgs();
+  XRay.addArgs(TC, Args, CmdArgs, InputType);
+
+  for (const auto &Filename :
+       Args.getAllArgValues(options::OPT_fprofile_list_EQ)) {
+    if (D.getVFS().exists(Filename))
+      CmdArgs.push_back(Args.MakeArgString("-fprofile-list=" + Filename));
+    else
+      D.Diag(clang::diag::err_drv_no_such_file) << Filename;
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_fpatchable_function_entry_EQ)) {
+    StringRef S0 = A->getValue(), S = S0;
+    unsigned Size, Offset = 0;
+    if (!Triple.isAArch64() && !Triple.isRISCV() && !Triple.isX86())
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getAsString(Args) << TripleStr;
+    else if (S.consumeInteger(10, Size) ||
+             (!S.empty() && (!S.consume_front(",") ||
+                             S.consumeInteger(10, Offset) || !S.empty())))
+      D.Diag(diag::err_drv_invalid_argument_to_option)
+          << S0 << A->getOption().getName();
+    else if (Size < Offset)
+      D.Diag(diag::err_drv_unsupported_fpatchable_function_entry_argument);
+    else {
+      CmdArgs.push_back(Args.MakeArgString(A->getSpelling() + Twine(Size)));
+      CmdArgs.push_back(Args.MakeArgString(
+          "-fpatchable-function-entry-offset=" + Twine(Offset)));
+    }
+  }
+
+  Args.AddLastArg(CmdArgs, options::OPT_fms_hotpatch);
+
+  if (TC.SupportsProfiling()) {
+    Args.AddLastArg(CmdArgs, options::OPT_pg);
+
+    llvm::Triple::ArchType Arch = TC.getArch();
+    if (Arg *A = Args.getLastArg(options::OPT_mfentry)) {
+      if (Arch == llvm::Triple::systemz || TC.getTriple().isX86())
+        A->render(Args, CmdArgs);
+      else
+        D.Diag(diag::err_drv_unsupported_opt_for_target)
+            << A->getAsString(Args) << TripleStr;
+    }
+    if (Arg *A = Args.getLastArg(options::OPT_mnop_mcount)) {
+      if (Arch == llvm::Triple::systemz)
+        A->render(Args, CmdArgs);
+      else
+        D.Diag(diag::err_drv_unsupported_opt_for_target)
+            << A->getAsString(Args) << TripleStr;
+    }
+    if (Arg *A = Args.getLastArg(options::OPT_mrecord_mcount)) {
+      if (Arch == llvm::Triple::systemz)
+        A->render(Args, CmdArgs);
+      else
+        D.Diag(diag::err_drv_unsupported_opt_for_target)
+            << A->getAsString(Args) << TripleStr;
+    }
+  }
+  if (Arg *A = Args.getLastArgNoClaim(options::OPT_p)) {
+    if (!TC.getTriple().isOSAIX() && !TC.getTriple().isOSOpenBSD()) {
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << A->getAsString(Args) << TripleStr;
+    }
+  }
+
+  if (Args.getLastArg(options::OPT_fapple_kext) ||
+      (Args.hasArg(options::OPT_mkernel) && types::isCXX(InputType)))
+    CmdArgs.push_back("-fapple-kext");
+
+  Args.AddLastArg(CmdArgs, options::OPT_altivec_src_compat);
+  Args.AddLastArg(CmdArgs, options::OPT_flax_vector_conversions_EQ);
+  Args.AddLastArg(CmdArgs, options::OPT_fobjc_sender_dependent_dispatch);
+  Args.AddLastArg(CmdArgs, options::OPT_fdiagnostics_print_source_range_info);
+  Args.AddLastArg(CmdArgs, options::OPT_fdiagnostics_parseable_fixits);
+  Args.AddLastArg(CmdArgs, options::OPT_ftime_report);
+  Args.AddLastArg(CmdArgs, options::OPT_ftime_report_EQ);
+  Args.AddLastArg(CmdArgs, options::OPT_ftime_trace);
+  Args.AddLastArg(CmdArgs, options::OPT_ftime_trace_granularity_EQ);
+  Args.AddLastArg(CmdArgs, options::OPT_ftime_trace_EQ);
+  Args.AddLastArg(CmdArgs, options::OPT_ftrapv);
+  Args.AddLastArg(CmdArgs, options::OPT_malign_double);
+  Args.AddLastArg(CmdArgs, options::OPT_fno_temp_file);
+
+  if (Arg *A = Args.getLastArg(options::OPT_ftrapv_handler_EQ)) {
+    CmdArgs.push_back("-ftrapv-handler");
+    CmdArgs.push_back(A->getValue());
+  }
+
+  Args.AddLastArg(CmdArgs, options::OPT_ftrap_function_EQ);
+
+  // -fno-strict-overflow implies -fwrapv if it isn't disabled, but
+  // -fstrict-overflow won't turn off an explicitly enabled -fwrapv.
+  if (Arg *A = Args.getLastArg(options::OPT_fwrapv, options::OPT_fno_wrapv)) {
+    if (A->getOption().matches(options::OPT_fwrapv))
+      CmdArgs.push_back("-fwrapv");
+  } else if (Arg *A = Args.getLastArg(options::OPT_fstrict_overflow,
+                                      options::OPT_fno_strict_overflow)) {
+    if (A->getOption().matches(options::OPT_fno_strict_overflow))
+      CmdArgs.push_back("-fwrapv");
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_freroll_loops,
+                               options::OPT_fno_reroll_loops))
+    if (A->getOption().matches(options::OPT_freroll_loops))
+      CmdArgs.push_back("-freroll-loops");
+
+  Args.AddLastArg(CmdArgs, options::OPT_ffinite_loops,
+                  options::OPT_fno_finite_loops);
+
+  Args.AddLastArg(CmdArgs, options::OPT_fwritable_strings);
+  Args.AddLastArg(CmdArgs, options::OPT_funroll_loops,
+                  options::OPT_fno_unroll_loops);
+
+  Args.AddLastArg(CmdArgs, options::OPT_fstrict_flex_arrays_EQ);
+
+  Args.AddLastArg(CmdArgs, options::OPT_pthread);
+
+  Args.addOptInFlag(CmdArgs, options::OPT_mspeculative_load_hardening,
+                    options::OPT_mno_speculative_load_hardening);
+
+  RenderSSPOptions(D, TC, Args, CmdArgs, KernelOrKext);
+  RenderSCPOptions(TC, Args, CmdArgs);
+  RenderTrivialAutoVarInitOptions(D, TC, Args, CmdArgs);
+
+  Args.AddLastArg(CmdArgs, options::OPT_fswift_async_fp_EQ);
+
+  Args.addOptInFlag(CmdArgs, options::OPT_mstackrealign,
+                    options::OPT_mno_stackrealign);
+
+  if (Args.hasArg(options::OPT_mstack_alignment)) {
+    StringRef alignment = Args.getLastArgValue(options::OPT_mstack_alignment);
+    CmdArgs.push_back(Args.MakeArgString("-mstack-alignment=" + alignment));
+  }
+
+  if (Args.hasArg(options::OPT_mstack_probe_size)) {
+    StringRef Size = Args.getLastArgValue(options::OPT_mstack_probe_size);
+
+    if (!Size.empty())
+      CmdArgs.push_back(Args.MakeArgString("-mstack-probe-size=" + Size));
+    else
+      CmdArgs.push_back("-mstack-probe-size=0");
+  }
+
+  Args.addOptOutFlag(CmdArgs, options::OPT_mstack_arg_probe,
+                     options::OPT_mno_stack_arg_probe);
+
+  if (Arg *A = Args.getLastArg(options::OPT_mrestrict_it,
+                               options::OPT_mno_restrict_it)) {
+    if (A->getOption().matches(options::OPT_mrestrict_it)) {
+      CmdArgs.push_back("-mllvm");
+      CmdArgs.push_back("-arm-restrict-it");
+    } else {
+      CmdArgs.push_back("-mllvm");
+      CmdArgs.push_back("-arm-default-it");
+    }
+  }
+
+  // Forward -cl options to -cc1
+  RenderOpenCLOptions(Args, CmdArgs, InputType);
+
+  // Forward hlsl options to -cc1
+  RenderHLSLOptions(Args, CmdArgs, InputType);
+
+  if (IsHIP) {
+    if (Args.hasFlag(options::OPT_fhip_new_launch_api,
+                     options::OPT_fno_hip_new_launch_api, true))
+      CmdArgs.push_back("-fhip-new-launch-api");
+    if (Args.hasFlag(options::OPT_fgpu_allow_device_init,
+                     options::OPT_fno_gpu_allow_device_init, false))
+      CmdArgs.push_back("-fgpu-allow-device-init");
+    Args.addOptInFlag(CmdArgs, options::OPT_fhip_kernel_arg_name,
+                      options::OPT_fno_hip_kernel_arg_name);
+  }
+
+  if (IsCuda || IsHIP) {
+    if (IsRDCMode)
+      CmdArgs.push_back("-fgpu-rdc");
+    if (Args.hasFlag(options::OPT_fgpu_defer_diag,
+                     options::OPT_fno_gpu_defer_diag, false))
+      CmdArgs.push_back("-fgpu-defer-diag");
+    if (Args.hasFlag(options::OPT_fgpu_exclude_wrong_side_overloads,
+                     options::OPT_fno_gpu_exclude_wrong_side_overloads,
+                     false)) {
+      CmdArgs.push_back("-fgpu-exclude-wrong-side-overloads");
+      CmdArgs.push_back("-fgpu-defer-diag");
+    }
+  }
+
+  // Forward -nogpulib to -cc1.
+  if (Args.hasArg(options::OPT_nogpulib))
+    CmdArgs.push_back("-nogpulib");
+
+  if (Arg *A = Args.getLastArg(options::OPT_fcf_protection_EQ)) {
+    CmdArgs.push_back(
+        Args.MakeArgString(Twine("-fcf-protection=") + A->getValue()));
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_mfunction_return_EQ))
+    CmdArgs.push_back(
+        Args.MakeArgString(Twine("-mfunction-return=") + A->getValue()));
+
+  Args.AddLastArg(CmdArgs, options::OPT_mindirect_branch_cs_prefix);
+
+  // Forward -f options with positive and negative forms; we translate these by
+  // hand.  Do not propagate PGO options to the GPU-side compilations as the
+  // profile info is for the host-side compilation only.
+  if (!(IsCudaDevice || IsHIPDevice)) {
+    if (Arg *A = getLastProfileSampleUseArg(Args)) {
+      auto *PGOArg = Args.getLastArg(
+          options::OPT_fprofile_generate, options::OPT_fprofile_generate_EQ,
+          options::OPT_fcs_profile_generate,
+          options::OPT_fcs_profile_generate_EQ, options::OPT_fprofile_use,
+          options::OPT_fprofile_use_EQ);
+      if (PGOArg)
+        D.Diag(diag::err_drv_argument_not_allowed_with)
+            << "SampleUse with PGO options";
+
+      StringRef fname = A->getValue();
+      if (!llvm::sys::fs::exists(fname))
+        D.Diag(diag::err_drv_no_such_file) << fname;
+      else
+        A->render(Args, CmdArgs);
+    }
+    Args.AddLastArg(CmdArgs, options::OPT_fprofile_remapping_file_EQ);
+
+    if (Args.hasFlag(options::OPT_fpseudo_probe_for_profiling,
+                     options::OPT_fno_pseudo_probe_for_profiling, false)) {
+      CmdArgs.push_back("-fpseudo-probe-for-profiling");
+      // Enforce -funique-internal-linkage-names if it's not explicitly turned
+      // off.
+      if (Args.hasFlag(options::OPT_funique_internal_linkage_names,
+                       options::OPT_fno_unique_internal_linkage_names, true))
+        CmdArgs.push_back("-funique-internal-linkage-names");
+    }
+  }
+  RenderBuiltinOptions(TC, RawTriple, Args, CmdArgs);
+
+  Args.addOptOutFlag(CmdArgs, options::OPT_fassume_sane_operator_new,
+                     options::OPT_fno_assume_sane_operator_new);
+
+  // -fblocks=0 is default.
+  if (Args.hasFlag(options::OPT_fblocks, options::OPT_fno_blocks,
+                   TC.IsBlocksDefault()) ||
+      (Args.hasArg(options::OPT_fgnu_runtime) &&
+       Args.hasArg(options::OPT_fobjc_nonfragile_abi) &&
+       !Args.hasArg(options::OPT_fno_blocks))) {
+    CmdArgs.push_back("-fblocks");
+
+    if (!Args.hasArg(options::OPT_fgnu_runtime) && !TC.hasBlocksRuntime())
+      CmdArgs.push_back("-fblocks-runtime-optional");
+  }
+
+  // -fencode-extended-block-signature=1 is default.
+  if (TC.IsEncodeExtendedBlockSignatureDefault())
+    CmdArgs.push_back("-fencode-extended-block-signature");
+
+  if (Args.hasFlag(options::OPT_fcoroutines_ts, options::OPT_fno_coroutines_ts,
+                   false) &&
+      types::isCXX(InputType)) {
+    D.Diag(diag::warn_deperecated_fcoroutines_ts_flag);
+    CmdArgs.push_back("-fcoroutines-ts");
+  }
+
+  if (Args.hasFlag(options::OPT_fcoro_aligned_allocation,
+                   options::OPT_fno_coro_aligned_allocation, false) &&
+      types::isCXX(InputType))
+    CmdArgs.push_back("-fcoro-aligned-allocation");
+
+  Args.AddLastArg(CmdArgs, options::OPT_fdouble_square_bracket_attributes,
+                  options::OPT_fno_double_square_bracket_attributes);
+
+  Args.addOptOutFlag(CmdArgs, options::OPT_faccess_control,
+                     options::OPT_fno_access_control);
+  Args.addOptOutFlag(CmdArgs, options::OPT_felide_constructors,
+                     options::OPT_fno_elide_constructors);
+
+  ToolChain::RTTIMode RTTIMode = TC.getRTTIMode();
+
+  if (KernelOrKext || (types::isCXX(InputType) &&
+                       (RTTIMode == ToolChain::RM_Disabled)))
+    CmdArgs.push_back("-fno-rtti");
+
+  // -fshort-enums=0 is default for all architectures except Hexagon and z/OS.
+  if (Args.hasFlag(options::OPT_fshort_enums, options::OPT_fno_short_enums,
+                   TC.getArch() == llvm::Triple::hexagon || Triple.isOSzOS()))
+    CmdArgs.push_back("-fshort-enums");
+
+  RenderCharacterOptions(Args, AuxTriple ? *AuxTriple : RawTriple, CmdArgs);
+
+  // -fuse-cxa-atexit is default.
+  if (!Args.hasFlag(
+          options::OPT_fuse_cxa_atexit, options::OPT_fno_use_cxa_atexit,
+          !RawTriple.isOSAIX() && !RawTriple.isOSWindows() &&
+              ((RawTriple.getVendor() != llvm::Triple::MipsTechnologies) ||
+               RawTriple.hasEnvironment())) ||
+      KernelOrKext)
+    CmdArgs.push_back("-fno-use-cxa-atexit");
+
+  if (Args.hasFlag(options::OPT_fregister_global_dtors_with_atexit,
+                   options::OPT_fno_register_global_dtors_with_atexit,
+                   RawTriple.isOSDarwin() && !KernelOrKext))
+    CmdArgs.push_back("-fregister-global-dtors-with-atexit");
+
+  Args.addOptInFlag(CmdArgs, options::OPT_fuse_line_directives,
+                    options::OPT_fno_use_line_directives);
+
+  // -fno-minimize-whitespace is default.
+  if (Args.hasFlag(options::OPT_fminimize_whitespace,
+                   options::OPT_fno_minimize_whitespace, false)) {
+    types::ID InputType = Inputs[0].getType();
+    if (!isDerivedFromC(InputType))
+      D.Diag(diag::err_drv_minws_unsupported_input_type)
+          << types::getTypeName(InputType);
+    CmdArgs.push_back("-fminimize-whitespace");
+  }
+
+  // -fms-extensions=0 is default.
+  if (Args.hasFlag(options::OPT_fms_extensions, options::OPT_fno_ms_extensions,
+                   IsWindowsMSVC))
+    CmdArgs.push_back("-fms-extensions");
+
+  // -fms-compatibility=0 is default.
+  bool IsMSVCCompat = Args.hasFlag(
+      options::OPT_fms_compatibility, options::OPT_fno_ms_compatibility,
+      (IsWindowsMSVC && Args.hasFlag(options::OPT_fms_extensions,
+                                     options::OPT_fno_ms_extensions, true)));
+  if (IsMSVCCompat)
+    CmdArgs.push_back("-fms-compatibility");
+
+  if (Triple.isWindowsMSVCEnvironment() && !D.IsCLMode() &&
+      Args.hasArg(options::OPT_fms_runtime_lib_EQ))
+    ProcessVSRuntimeLibrary(Args, CmdArgs);
+
+  // Handle -fgcc-version, if present.
+  VersionTuple GNUCVer;
+  if (Arg *A = Args.getLastArg(options::OPT_fgnuc_version_EQ)) {
+    // Check that the version has 1 to 3 components and the minor and patch
+    // versions fit in two decimal digits.
+    StringRef Val = A->getValue();
+    Val = Val.empty() ? "0" : Val; // Treat "" as 0 or disable.
+    bool Invalid = GNUCVer.tryParse(Val);
+    unsigned Minor = GNUCVer.getMinor().value_or(0);
+    unsigned Patch = GNUCVer.getSubminor().value_or(0);
+    if (Invalid || GNUCVer.getBuild() || Minor >= 100 || Patch >= 100) {
+      D.Diag(diag::err_drv_invalid_value)
+          << A->getAsString(Args) << A->getValue();
+    }
+  } else if (!IsMSVCCompat) {
+    // Imitate GCC 4.2.1 by default if -fms-compatibility is not in effect.
+    GNUCVer = VersionTuple(4, 2, 1);
+  }
+  if (!GNUCVer.empty()) {
+    CmdArgs.push_back(
+        Args.MakeArgString("-fgnuc-version=" + GNUCVer.getAsString()));
+  }
+
+  VersionTuple MSVT = TC.computeMSVCVersion(&D, Args);
+  if (!MSVT.empty())
+    CmdArgs.push_back(
+        Args.MakeArgString("-fms-compatibility-version=" + MSVT.getAsString()));
+
+  bool IsMSVC2015Compatible = MSVT.getMajor() >= 19;
+  if (ImplyVCPPCVer) {
+    StringRef LanguageStandard;
+    if (const Arg *StdArg = Args.getLastArg(options::OPT__SLASH_std)) {
+      Std = StdArg;
+      LanguageStandard = llvm::StringSwitch<StringRef>(StdArg->getValue())
+                             .Case("c11", "-std=c11")
+                             .Case("c17", "-std=c17")
+                             .Default("");
+      if (LanguageStandard.empty())
+        D.Diag(clang::diag::warn_drv_unused_argument)
+            << StdArg->getAsString(Args);
+    }
+    CmdArgs.push_back(LanguageStandard.data());
+  }
+  if (ImplyVCPPCXXVer) {
+    StringRef LanguageStandard;
+    if (const Arg *StdArg = Args.getLastArg(options::OPT__SLASH_std)) {
+      Std = StdArg;
+      LanguageStandard = llvm::StringSwitch<StringRef>(StdArg->getValue())
+                             .Case("c++14", "-std=c++14")
+                             .Case("c++17", "-std=c++17")
+                             .Case("c++20", "-std=c++20")
+                             .Case("c++latest", "-std=c++2b")
+                             .Default("");
+      if (LanguageStandard.empty())
+        D.Diag(clang::diag::warn_drv_unused_argument)
+            << StdArg->getAsString(Args);
+    }
+
+    if (LanguageStandard.empty()) {
+      if (IsMSVC2015Compatible)
+        LanguageStandard = "-std=c++14";
+      else
+        LanguageStandard = "-std=c++11";
+    }
+
+    CmdArgs.push_back(LanguageStandard.data());
+  }
+
+  Args.addOptInFlag(CmdArgs, options::OPT_fborland_extensions,
+                    options::OPT_fno_borland_extensions);
+
+  // -fno-declspec is default, except for PS4/PS5.
+  if (Args.hasFlag(options::OPT_fdeclspec, options::OPT_fno_declspec,
+                   RawTriple.isPS()))
+    CmdArgs.push_back("-fdeclspec");
+  else if (Args.hasArg(options::OPT_fno_declspec))
+    CmdArgs.push_back("-fno-declspec"); // Explicitly disabling __declspec.
+
+  // -fthreadsafe-static is default, except for MSVC compatibility versions less
+  // than 19.
+  if (!Args.hasFlag(options::OPT_fthreadsafe_statics,
+                    options::OPT_fno_threadsafe_statics,
+                    !types::isOpenCL(InputType) &&
+                        (!IsWindowsMSVC || IsMSVC2015Compatible)))
+    CmdArgs.push_back("-fno-threadsafe-statics");
+
+  // -fno-delayed-template-parsing is default, except when targeting MSVC.
+  // Many old Windows SDK versions require this to parse.
+  // FIXME: MSVC introduced /Zc:twoPhase- to disable this behavior in their
+  // compiler. We should be able to disable this by default at some point.
+  if (Args.hasFlag(options::OPT_fdelayed_template_parsing,
+                   options::OPT_fno_delayed_template_parsing, IsWindowsMSVC))
+    CmdArgs.push_back("-fdelayed-template-parsing");
+
+  // -fgnu-keywords default varies depending on language; only pass if
+  // specified.
+  Args.AddLastArg(CmdArgs, options::OPT_fgnu_keywords,
+                  options::OPT_fno_gnu_keywords);
+
+  Args.addOptInFlag(CmdArgs, options::OPT_fgnu89_inline,
+                    options::OPT_fno_gnu89_inline);
+
+  const Arg *InlineArg = Args.getLastArg(options::OPT_finline_functions,
+                                         options::OPT_finline_hint_functions,
+                                         options::OPT_fno_inline_functions);
+  if (Arg *A = Args.getLastArg(options::OPT_finline, options::OPT_fno_inline)) {
+    if (A->getOption().matches(options::OPT_fno_inline))
+      A->render(Args, CmdArgs);
+  } else if (InlineArg) {
+    InlineArg->render(Args, CmdArgs);
+  }
+
+  Args.AddLastArg(CmdArgs, options::OPT_finline_max_stacksize_EQ);
+
+  bool HaveModules =
+      RenderModulesOptions(C, D, Args, Input, Output, Std, CmdArgs);
+
+  if (Args.hasFlag(options::OPT_fpch_validate_input_files_content,
+                   options::OPT_fno_pch_validate_input_files_content, false))
+    CmdArgs.push_back("-fvalidate-ast-input-files-content");
+  if (Args.hasFlag(options::OPT_fpch_instantiate_templates,
+                   options::OPT_fno_pch_instantiate_templates, false))
+    CmdArgs.push_back("-fpch-instantiate-templates");
+  if (Args.hasFlag(options::OPT_fpch_codegen, options::OPT_fno_pch_codegen,
+                   false))
+    CmdArgs.push_back("-fmodules-codegen");
+  if (Args.hasFlag(options::OPT_fpch_debuginfo, options::OPT_fno_pch_debuginfo,
+                   false))
+    CmdArgs.push_back("-fmodules-debuginfo");
+
+  ObjCRuntime Runtime = AddObjCRuntimeArgs(Args, Inputs, CmdArgs, rewriteKind);
+  RenderObjCOptions(TC, D, RawTriple, Args, Runtime, rewriteKind != RK_None,
+                    Input, CmdArgs);
+
+  if (types::isObjC(Input.getType()) &&
+      Args.hasFlag(options::OPT_fobjc_encode_cxx_class_template_spec,
+                   options::OPT_fno_objc_encode_cxx_class_template_spec,
+                   !Runtime.isNeXTFamily()))
+    CmdArgs.push_back("-fobjc-encode-cxx-class-template-spec");
+
+  if (Args.hasFlag(options::OPT_fapplication_extension,
+                   options::OPT_fno_application_extension, false))
+    CmdArgs.push_back("-fapplication-extension");
+
+  // Handle GCC-style exception args.
+  bool EH = false;
+  if (!C.getDriver().IsCLMode())
+    EH = addExceptionArgs(Args, InputType, TC, KernelOrKext, Runtime, CmdArgs);
+
+  // Handle exception personalities
+  Arg *A = Args.getLastArg(
+      options::OPT_fsjlj_exceptions, options::OPT_fseh_exceptions,
+      options::OPT_fdwarf_exceptions, options::OPT_fwasm_exceptions);
+  if (A) {
+    const Option &Opt = A->getOption();
+    if (Opt.matches(options::OPT_fsjlj_exceptions))
+      CmdArgs.push_back("-exception-model=sjlj");
+    if (Opt.matches(options::OPT_fseh_exceptions))
+      CmdArgs.push_back("-exception-model=seh");
+    if (Opt.matches(options::OPT_fdwarf_exceptions))
+      CmdArgs.push_back("-exception-model=dwarf");
+    if (Opt.matches(options::OPT_fwasm_exceptions))
+      CmdArgs.push_back("-exception-model=wasm");
+  } else {
+    switch (TC.GetExceptionModel(Args)) {
+    default:
+      break;
+    case llvm::ExceptionHandling::DwarfCFI:
+      CmdArgs.push_back("-exception-model=dwarf");
+      break;
+    case llvm::ExceptionHandling::SjLj:
+      CmdArgs.push_back("-exception-model=sjlj");
+      break;
+    case llvm::ExceptionHandling::WinEH:
+      CmdArgs.push_back("-exception-model=seh");
+      break;
+    }
+  }
+
+  // C++ "sane" operator new.
+  Args.addOptOutFlag(CmdArgs, options::OPT_fassume_sane_operator_new,
+                     options::OPT_fno_assume_sane_operator_new);
+
+  // -frelaxed-template-template-args is off by default, as it is a severe
+  // breaking change until a corresponding change to template partial ordering
+  // is provided.
+  Args.addOptInFlag(CmdArgs, options::OPT_frelaxed_template_template_args,
+                    options::OPT_fno_relaxed_template_template_args);
+
+  // -fsized-deallocation is off by default, as it is an ABI-breaking change for
+  // most platforms.
+  Args.addOptInFlag(CmdArgs, options::OPT_fsized_deallocation,
+                    options::OPT_fno_sized_deallocation);
+
+  // -faligned-allocation is on by default in C++17 onwards and otherwise off
+  // by default.
+  if (Arg *A = Args.getLastArg(options::OPT_faligned_allocation,
+                               options::OPT_fno_aligned_allocation,
+                               options::OPT_faligned_new_EQ)) {
+    if (A->getOption().matches(options::OPT_fno_aligned_allocation))
+      CmdArgs.push_back("-fno-aligned-allocation");
+    else
+      CmdArgs.push_back("-faligned-allocation");
+  }
+
+  // The default new alignment can be specified using a dedicated option or via
+  // a GCC-compatible option that also turns on aligned allocation.
+  if (Arg *A = Args.getLastArg(options::OPT_fnew_alignment_EQ,
+                               options::OPT_faligned_new_EQ))
+    CmdArgs.push_back(
+        Args.MakeArgString(Twine("-fnew-alignment=") + A->getValue()));
+
+  // -fconstant-cfstrings is default, and may be subject to argument translation
+  // on Darwin.
+  if (!Args.hasFlag(options::OPT_fconstant_cfstrings,
+                    options::OPT_fno_constant_cfstrings, true) ||
+      !Args.hasFlag(options::OPT_mconstant_cfstrings,
+                    options::OPT_mno_constant_cfstrings, true))
+    CmdArgs.push_back("-fno-constant-cfstrings");
+
+  Args.addOptInFlag(CmdArgs, options::OPT_fpascal_strings,
+                    options::OPT_fno_pascal_strings);
+
+  // Honor -fpack-struct= and -fpack-struct, if given. Note that
+  // -fno-pack-struct doesn't apply to -fpack-struct=.
+  if (Arg *A = Args.getLastArg(options::OPT_fpack_struct_EQ)) {
+    std::string PackStructStr = "-fpack-struct=";
+    PackStructStr += A->getValue();
+    CmdArgs.push_back(Args.MakeArgString(PackStructStr));
+  } else if (Args.hasFlag(options::OPT_fpack_struct,
+                          options::OPT_fno_pack_struct, false)) {
+    CmdArgs.push_back("-fpack-struct=1");
+  }
+
+  // Handle -fmax-type-align=N and -fno-type-align
+  bool SkipMaxTypeAlign = Args.hasArg(options::OPT_fno_max_type_align);
+  if (Arg *A = Args.getLastArg(options::OPT_fmax_type_align_EQ)) {
+    if (!SkipMaxTypeAlign) {
+      std::string MaxTypeAlignStr = "-fmax-type-align=";
+      MaxTypeAlignStr += A->getValue();
+      CmdArgs.push_back(Args.MakeArgString(MaxTypeAlignStr));
+    }
+  } else if (RawTriple.isOSDarwin()) {
+    if (!SkipMaxTypeAlign) {
+      std::string MaxTypeAlignStr = "-fmax-type-align=16";
+      CmdArgs.push_back(Args.MakeArgString(MaxTypeAlignStr));
+    }
+  }
+
+  if (!Args.hasFlag(options::OPT_Qy, options::OPT_Qn, true))
+    CmdArgs.push_back("-Qn");
+
+  // -fno-common is the default, set -fcommon only when that flag is set.
+  Args.addOptInFlag(CmdArgs, options::OPT_fcommon, options::OPT_fno_common);
+
+  // -fsigned-bitfields is default, and clang doesn't yet support
+  // -funsigned-bitfields.
+  if (!Args.hasFlag(options::OPT_fsigned_bitfields,
+                    options::OPT_funsigned_bitfields, true))
+    D.Diag(diag::warn_drv_clang_unsupported)
+        << Args.getLastArg(options::OPT_funsigned_bitfields)->getAsString(Args);
+
+  // -fsigned-bitfields is default, and clang doesn't support -fno-for-scope.
+  if (!Args.hasFlag(options::OPT_ffor_scope, options::OPT_fno_for_scope, true))
+    D.Diag(diag::err_drv_clang_unsupported)
+        << Args.getLastArg(options::OPT_fno_for_scope)->getAsString(Args);
+
+  // -finput_charset=UTF-8 is default. Reject others
+  if (Arg *inputCharset = Args.getLastArg(options::OPT_finput_charset_EQ)) {
+    StringRef value = inputCharset->getValue();
+    if (!value.equals_insensitive("utf-8"))
+      D.Diag(diag::err_drv_invalid_value) << inputCharset->getAsString(Args)
+                                          << value;
+  }
+
+  // -fexec_charset=UTF-8 is default. Reject others
+  if (Arg *execCharset = Args.getLastArg(options::OPT_fexec_charset_EQ)) {
+    StringRef value = execCharset->getValue();
+    if (!value.equals_insensitive("utf-8"))
+      D.Diag(diag::err_drv_invalid_value) << execCharset->getAsString(Args)
+                                          << value;
+  }
+
+  RenderDiagnosticsOptions(D, Args, CmdArgs);
+
+  Args.addOptInFlag(CmdArgs, options::OPT_fasm_blocks,
+                    options::OPT_fno_asm_blocks);
+
+  Args.addOptOutFlag(CmdArgs, options::OPT_fgnu_inline_asm,
+                     options::OPT_fno_gnu_inline_asm);
+
+  // Enable vectorization per default according to the optimization level
+  // selected. For optimization levels that want vectorization we use the alias
+  // option to simplify the hasFlag logic.
+  bool EnableVec = shouldEnableVectorizerAtOLevel(Args, false);
+  OptSpecifier VectorizeAliasOption =
+      EnableVec ? options::OPT_O_Group : options::OPT_fvectorize;
+  if (Args.hasFlag(options::OPT_fvectorize, VectorizeAliasOption,
+                   options::OPT_fno_vectorize, EnableVec))
+    CmdArgs.push_back("-vectorize-loops");
+
+  // -fslp-vectorize is enabled based on the optimization level selected.
+  bool EnableSLPVec = shouldEnableVectorizerAtOLevel(Args, true);
+  OptSpecifier SLPVectAliasOption =
+      EnableSLPVec ? options::OPT_O_Group : options::OPT_fslp_vectorize;
+  if (Args.hasFlag(options::OPT_fslp_vectorize, SLPVectAliasOption,
+                   options::OPT_fno_slp_vectorize, EnableSLPVec))
+    CmdArgs.push_back("-vectorize-slp");
+
+  ParseMPreferVectorWidth(D, Args, CmdArgs);
+
+  Args.AddLastArg(CmdArgs, options::OPT_fshow_overloads_EQ);
+  Args.AddLastArg(CmdArgs,
+                  options::OPT_fsanitize_undefined_strip_path_components_EQ);
+
+  // -fdollars-in-identifiers default varies depending on platform and
+  // language; only pass if specified.
+  if (Arg *A = Args.getLastArg(options::OPT_fdollars_in_identifiers,
+                               options::OPT_fno_dollars_in_identifiers)) {
+    if (A->getOption().matches(options::OPT_fdollars_in_identifiers))
+      CmdArgs.push_back("-fdollars-in-identifiers");
+    else
+      CmdArgs.push_back("-fno-dollars-in-identifiers");
+  }
+
+  Args.addOptInFlag(CmdArgs, options::OPT_fapple_pragma_pack,
+                    options::OPT_fno_apple_pragma_pack);
+
+  if (Args.hasFlag(options::OPT_fxl_pragma_pack,
+                   options::OPT_fno_xl_pragma_pack, RawTriple.isOSAIX()))
+    CmdArgs.push_back("-fxl-pragma-pack");
+
+  // Remarks can be enabled with any of the `-f.*optimization-record.*` flags.
+  if (willEmitRemarks(Args) && checkRemarksOptions(D, Args, Triple))
+    renderRemarksOptions(Args, CmdArgs, Triple, Input, Output, JA);
+
+  bool RewriteImports = Args.hasFlag(options::OPT_frewrite_imports,
+                                     options::OPT_fno_rewrite_imports, false);
+  if (RewriteImports)
+    CmdArgs.push_back("-frewrite-imports");
+
+  Args.addOptInFlag(CmdArgs, options::OPT_fdirectives_only,
+                    options::OPT_fno_directives_only);
+
+  // Enable rewrite includes if the user's asked for it or if we're generating
+  // diagnostics.
+  // TODO: Once -module-dependency-dir works with -frewrite-includes it'd be
+  // nice to enable this when doing a crashdump for modules as well.
+  if (Args.hasFlag(options::OPT_frewrite_includes,
+                   options::OPT_fno_rewrite_includes, false) ||
+      (C.isForDiagnostics() && !HaveModules))
+    CmdArgs.push_back("-frewrite-includes");
+
+  // Only allow -traditional or -traditional-cpp outside in preprocessing modes.
+  if (Arg *A = Args.getLastArg(options::OPT_traditional,
+                               options::OPT_traditional_cpp)) {
+    if (isa<PreprocessJobAction>(JA))
+      CmdArgs.push_back("-traditional-cpp");
+    else
+      D.Diag(diag::err_drv_clang_unsupported) << A->getAsString(Args);
+  }
+
+  Args.AddLastArg(CmdArgs, options::OPT_dM);
+  Args.AddLastArg(CmdArgs, options::OPT_dD);
+  Args.AddLastArg(CmdArgs, options::OPT_dI);
+
+  Args.AddLastArg(CmdArgs, options::OPT_fmax_tokens_EQ);
+
+  // Handle serialized diagnostics.
+  if (Arg *A = Args.getLastArg(options::OPT__serialize_diags)) {
+    CmdArgs.push_back("-serialize-diagnostic-file");
+    CmdArgs.push_back(Args.MakeArgString(A->getValue()));
+  }
+
+  if (Args.hasArg(options::OPT_fretain_comments_from_system_headers))
+    CmdArgs.push_back("-fretain-comments-from-system-headers");
+
+  // Forward -fcomment-block-commands to -cc1.
+  Args.AddAllArgs(CmdArgs, options::OPT_fcomment_block_commands);
+  // Forward -fparse-all-comments to -cc1.
+  Args.AddAllArgs(CmdArgs, options::OPT_fparse_all_comments);
+
+  // Turn -fplugin=name.so into -load name.so
+  for (const Arg *A : Args.filtered(options::OPT_fplugin_EQ)) {
+    CmdArgs.push_back("-load");
+    CmdArgs.push_back(A->getValue());
+    A->claim();
+  }
+
+  // Turn -fplugin-arg-pluginname-key=value into
+  // -plugin-arg-pluginname key=value
+  // GCC has an actual plugin_argument struct with key/value pairs that it
+  // passes to its plugins, but we don't, so just pass it on as-is.
+  //
+  // The syntax for -fplugin-arg- is ambiguous if both plugin name and
+  // argument key are allowed to contain dashes. GCC therefore only
+  // allows dashes in the key. We do the same.
+  for (const Arg *A : Args.filtered(options::OPT_fplugin_arg)) {
+    auto ArgValue = StringRef(A->getValue());
+    auto FirstDashIndex = ArgValue.find('-');
+    StringRef PluginName = ArgValue.substr(0, FirstDashIndex);
+    StringRef Arg = ArgValue.substr(FirstDashIndex + 1);
+
+    A->claim();
+    if (FirstDashIndex == StringRef::npos || Arg.empty()) {
+      if (PluginName.empty()) {
+        D.Diag(diag::warn_drv_missing_plugin_name) << A->getAsString(Args);
+      } else {
+        D.Diag(diag::warn_drv_missing_plugin_arg)
+            << PluginName << A->getAsString(Args);
+      }
+      continue;
+    }
+
+    CmdArgs.push_back(Args.MakeArgString(Twine("-plugin-arg-") + PluginName));
+    CmdArgs.push_back(Args.MakeArgString(Arg));
+  }
+
+  // Forward -fpass-plugin=name.so to -cc1.
+  for (const Arg *A : Args.filtered(options::OPT_fpass_plugin_EQ)) {
+    CmdArgs.push_back(
+        Args.MakeArgString(Twine("-fpass-plugin=") + A->getValue()));
+    A->claim();
+  }
+
+  // Setup statistics file output.
+  SmallString<128> StatsFile = getStatsFileName(Args, Output, Input, D);
+  if (!StatsFile.empty())
+    CmdArgs.push_back(Args.MakeArgString(Twine("-stats-file=") + StatsFile));
+
+  // Forward -Xclang arguments to -cc1, and -mllvm arguments to the LLVM option
+  // parser.
+  for (auto Arg : Args.filtered(options::OPT_Xclang)) {
+    Arg->claim();
+    // -finclude-default-header flag is for preprocessor,
+    // do not pass it to other cc1 commands when save-temps is enabled
+    if (C.getDriver().isSaveTempsEnabled() &&
+        !isa<PreprocessJobAction>(JA)) {
+      if (StringRef(Arg->getValue()) == "-finclude-default-header")
+        continue;
+    }
+    CmdArgs.push_back(Arg->getValue());
+  }
+  for (const Arg *A : Args.filtered(options::OPT_mllvm)) {
+    A->claim();
+
+    // We translate this by hand to the -cc1 argument, since nightly test uses
+    // it and developers have been trained to spell it with -mllvm. Both
+    // spellings are now deprecated and should be removed.
+    if (StringRef(A->getValue(0)) == "-disable-llvm-optzns") {
+      CmdArgs.push_back("-disable-llvm-optzns");
+    } else {
+      A->render(Args, CmdArgs);
+    }
+  }
+
+  // With -save-temps, we want to save the unoptimized bitcode output from the
+  // CompileJobAction, use -disable-llvm-passes to get pristine IR generated
+  // by the frontend.
+  // When -fembed-bitcode is enabled, optimized bitcode is emitted because it
+  // has slightly different breakdown between stages.
+  // FIXME: -fembed-bitcode -save-temps will save optimized bitcode instead of
+  // pristine IR generated by the frontend. Ideally, a new compile action should
+  // be added so both IR can be captured.
+  if ((C.getDriver().isSaveTempsEnabled() ||
+       JA.isHostOffloading(Action::OFK_OpenMP)) &&
+      !(C.getDriver().embedBitcodeInObject() && !IsUsingLTO) &&
+      isa<CompileJobAction>(JA))
+    CmdArgs.push_back("-disable-llvm-passes");
+
+  Args.AddAllArgs(CmdArgs, options::OPT_undef);
+
+  const char *Exec = D.getClangProgramPath();
+
+  // Optionally embed the -cc1 level arguments into the debug info or a
+  // section, for build analysis.
+  // Also record command line arguments into the debug info if
+  // -grecord-gcc-switches options is set on.
+  // By default, -gno-record-gcc-switches is set on and no recording.
+  auto GRecordSwitches =
+      Args.hasFlag(options::OPT_grecord_command_line,
+                   options::OPT_gno_record_command_line, false);
+  auto FRecordSwitches =
+      Args.hasFlag(options::OPT_frecord_command_line,
+                   options::OPT_fno_record_command_line, false);
+  if (FRecordSwitches && !Triple.isOSBinFormatELF())
+    D.Diag(diag::err_drv_unsupported_opt_for_target)
+        << Args.getLastArg(options::OPT_frecord_command_line)->getAsString(Args)
+        << TripleStr;
+  if (TC.UseDwarfDebugFlags() || GRecordSwitches || FRecordSwitches) {
+    ArgStringList OriginalArgs;
+    for (const auto &Arg : Args)
+      Arg->render(Args, OriginalArgs);
+
+    SmallString<256> Flags;
+    EscapeSpacesAndBackslashes(Exec, Flags);
+    for (const char *OriginalArg : OriginalArgs) {
+      SmallString<128> EscapedArg;
+      EscapeSpacesAndBackslashes(OriginalArg, EscapedArg);
+      Flags += " ";
+      Flags += EscapedArg;
+    }
+    auto FlagsArgString = Args.MakeArgString(Flags);
+    if (TC.UseDwarfDebugFlags() || GRecordSwitches) {
+      CmdArgs.push_back("-dwarf-debug-flags");
+      CmdArgs.push_back(FlagsArgString);
+    }
+    if (FRecordSwitches) {
+      CmdArgs.push_back("-record-command-line");
+      CmdArgs.push_back(FlagsArgString);
+    }
+  }
+
+  // Host-side offloading compilation receives all device-side outputs. Include
+  // them in the host compilation depending on the target. If the host inputs
+  // are not empty we use the new-driver scheme, otherwise use the old scheme.
+  if ((IsCuda || IsHIP) && CudaDeviceInput) {
+    CmdArgs.push_back("-fcuda-include-gpubinary");
+    CmdArgs.push_back(CudaDeviceInput->getFilename());
+  } else if (!HostOffloadingInputs.empty()) {
+    if ((IsCuda || IsHIP) && !IsRDCMode) {
+      assert(HostOffloadingInputs.size() == 1 && "Only one input expected");
+      CmdArgs.push_back("-fcuda-include-gpubinary");
+      CmdArgs.push_back(HostOffloadingInputs.front().getFilename());
+    } else {
+      for (const InputInfo Input : HostOffloadingInputs)
+        CmdArgs.push_back(Args.MakeArgString("-fembed-offload-object=" +
+                                             TC.getInputFilename(Input)));
+    }
+  }
+
+  if (IsCuda) {
+    if (Args.hasFlag(options::OPT_fcuda_short_ptr,
+                     options::OPT_fno_cuda_short_ptr, false))
+      CmdArgs.push_back("-fcuda-short-ptr");
+  }
+
+  if (IsCuda || IsHIP) {
+    // Determine the original source input.
+    const Action *SourceAction = &JA;
+    while (SourceAction->getKind() != Action::InputClass) {
+      assert(!SourceAction->getInputs().empty() && "unexpected root action!");
+      SourceAction = SourceAction->getInputs()[0];
+    }
+    auto CUID = cast<InputAction>(SourceAction)->getId();
+    if (!CUID.empty())
+      CmdArgs.push_back(Args.MakeArgString(Twine("-cuid=") + Twine(CUID)));
+  }
+
+  if (IsHIP) {
+    CmdArgs.push_back("-fcuda-allow-variadic-functions");
+    Args.AddLastArg(CmdArgs, options::OPT_fgpu_default_stream_EQ);
+  }
+
+  if (IsCudaDevice || IsHIPDevice) {
+    StringRef InlineThresh =
+        Args.getLastArgValue(options::OPT_fgpu_inline_threshold_EQ);
+    if (!InlineThresh.empty()) {
+      std::string ArgStr =
+          std::string("-inline-threshold=") + InlineThresh.str();
+      CmdArgs.append({"-mllvm", Args.MakeArgStringRef(ArgStr)});
+    }
+  }
+
+  // OpenMP offloading device jobs take the argument -fopenmp-host-ir-file-path
+  // to specify the result of the compile phase on the host, so the meaningful
+  // device declarations can be identified. Also, -fopenmp-is-device is passed
+  // along to tell the frontend that it is generating code for a device, so that
+  // only the relevant declarations are emitted.
+  if (IsOpenMPDevice) {
+    CmdArgs.push_back("-fopenmp-is-device");
+    if (OpenMPDeviceInput) {
+      CmdArgs.push_back("-fopenmp-host-ir-file-path");
+      CmdArgs.push_back(Args.MakeArgString(OpenMPDeviceInput->getFilename()));
+    }
+  }
+
+  if (Triple.isAMDGPU()) {
+    handleAMDGPUCodeObjectVersionOptions(D, Args, CmdArgs);
+
+    Args.addOptInFlag(CmdArgs, options::OPT_munsafe_fp_atomics,
+                      options::OPT_mno_unsafe_fp_atomics);
+  }
+
+  // For all the host OpenMP offloading compile jobs we need to pass the targets
+  // information using -fopenmp-targets= option.
+  if (JA.isHostOffloading(Action::OFK_OpenMP)) {
+    SmallString<128> Targets("-fopenmp-targets=");
+
+    SmallVector<std::string, 4> Triples;
+    auto TCRange = C.getOffloadToolChains<Action::OFK_OpenMP>();
+    std::transform(TCRange.first, TCRange.second, std::back_inserter(Triples),
+                   [](auto TC) { return TC.second->getTripleString(); });
+    CmdArgs.push_back(Args.MakeArgString(Targets + llvm::join(Triples, ",")));
+  }
+
+  bool VirtualFunctionElimination =
+      Args.hasFlag(options::OPT_fvirtual_function_elimination,
+                   options::OPT_fno_virtual_function_elimination, false);
+  if (VirtualFunctionElimination) {
+    // VFE requires full LTO (currently, this might be relaxed to allow ThinLTO
+    // in the future).
+    if (LTOMode != LTOK_Full)
+      D.Diag(diag::err_drv_argument_only_allowed_with)
+          << "-fvirtual-function-elimination"
+          << "-flto=full";
+
+    CmdArgs.push_back("-fvirtual-function-elimination");
+  }
+
+  // VFE requires whole-program-vtables, and enables it by default.
+  bool WholeProgramVTables = Args.hasFlag(
+      options::OPT_fwhole_program_vtables,
+      options::OPT_fno_whole_program_vtables, VirtualFunctionElimination);
+  if (VirtualFunctionElimination && !WholeProgramVTables) {
+    D.Diag(diag::err_drv_argument_not_allowed_with)
+        << "-fno-whole-program-vtables"
+        << "-fvirtual-function-elimination";
+  }
+
+  if (WholeProgramVTables) {
+    // Propagate -fwhole-program-vtables if this is an LTO compile.
+    if (IsUsingLTO)
+      CmdArgs.push_back("-fwhole-program-vtables");
+    // Check if we passed LTO options but they were suppressed because this is a
+    // device offloading action, or we passed device offload LTO options which
+    // were suppressed because this is not the device offload action.
+    // Otherwise, issue an error.
+    else if (!D.isUsingLTO(!IsDeviceOffloadAction))
+      D.Diag(diag::err_drv_argument_only_allowed_with)
+          << "-fwhole-program-vtables"
+          << "-flto";
+  }
+
+  bool DefaultsSplitLTOUnit =
+      (WholeProgramVTables || SanitizeArgs.needsLTO()) &&
+      (LTOMode == LTOK_Full || TC.canSplitThinLTOUnit());
+  bool SplitLTOUnit =
+      Args.hasFlag(options::OPT_fsplit_lto_unit,
+                   options::OPT_fno_split_lto_unit, DefaultsSplitLTOUnit);
+  if (SanitizeArgs.needsLTO() && !SplitLTOUnit)
+    D.Diag(diag::err_drv_argument_not_allowed_with) << "-fno-split-lto-unit"
+                                                    << "-fsanitize=cfi";
+  if (SplitLTOUnit)
+    CmdArgs.push_back("-fsplit-lto-unit");
+
+  if (Arg *A = Args.getLastArg(options::OPT_fglobal_isel,
+                               options::OPT_fno_global_isel)) {
+    CmdArgs.push_back("-mllvm");
+    if (A->getOption().matches(options::OPT_fglobal_isel)) {
+      CmdArgs.push_back("-global-isel=1");
+
+      // GISel is on by default on AArch64 -O0, so don't bother adding
+      // the fallback remarks for it. Other combinations will add a warning of
+      // some kind.
+      bool IsArchSupported = Triple.getArch() == llvm::Triple::aarch64;
+      bool IsOptLevelSupported = false;
+
+      Arg *A = Args.getLastArg(options::OPT_O_Group);
+      if (Triple.getArch() == llvm::Triple::aarch64) {
+        if (!A || A->getOption().matches(options::OPT_O0))
+          IsOptLevelSupported = true;
+      }
+      if (!IsArchSupported || !IsOptLevelSupported) {
+        CmdArgs.push_back("-mllvm");
+        CmdArgs.push_back("-global-isel-abort=2");
+
+        if (!IsArchSupported)
+          D.Diag(diag::warn_drv_global_isel_incomplete) << Triple.getArchName();
+        else
+          D.Diag(diag::warn_drv_global_isel_incomplete_opt);
+      }
+    } else {
+      CmdArgs.push_back("-global-isel=0");
+    }
+  }
+
+  if (Args.hasArg(options::OPT_forder_file_instrumentation)) {
+     CmdArgs.push_back("-forder-file-instrumentation");
+     // Enable order file instrumentation when ThinLTO is not on. When ThinLTO is
+     // on, we need to pass these flags as linker flags and that will be handled
+     // outside of the compiler.
+     if (!IsUsingLTO) {
+       CmdArgs.push_back("-mllvm");
+       CmdArgs.push_back("-enable-order-file-instrumentation");
+     }
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_fforce_enable_int128,
+                               options::OPT_fno_force_enable_int128)) {
+    if (A->getOption().matches(options::OPT_fforce_enable_int128))
+      CmdArgs.push_back("-fforce-enable-int128");
+  }
+
+  Args.addOptInFlag(CmdArgs, options::OPT_fkeep_static_consts,
+                    options::OPT_fno_keep_static_consts);
+  Args.addOptInFlag(CmdArgs, options::OPT_fcomplete_member_pointers,
+                    options::OPT_fno_complete_member_pointers);
+  Args.addOptOutFlag(CmdArgs, options::OPT_fcxx_static_destructors,
+                     options::OPT_fno_cxx_static_destructors);
+
+  addMachineOutlinerArgs(D, Args, CmdArgs, Triple, /*IsLTO=*/false);
+
+  if (Arg *A = Args.getLastArg(options::OPT_moutline_atomics,
+                               options::OPT_mno_outline_atomics)) {
+    // Option -moutline-atomics supported for AArch64 target only.
+    if (!Triple.isAArch64()) {
+      D.Diag(diag::warn_drv_moutline_atomics_unsupported_opt)
+          << Triple.getArchName() << A->getOption().getName();
+    } else {
+      if (A->getOption().matches(options::OPT_moutline_atomics)) {
+        CmdArgs.push_back("-target-feature");
+        CmdArgs.push_back("+outline-atomics");
+      } else {
+        CmdArgs.push_back("-target-feature");
+        CmdArgs.push_back("-outline-atomics");
+      }
+    }
+  } else if (Triple.isAArch64() &&
+             getToolChain().IsAArch64OutlineAtomicsDefault(Args)) {
+    CmdArgs.push_back("-target-feature");
+    CmdArgs.push_back("+outline-atomics");
+  }
+
+  if (Triple.isAArch64() &&
+      (Args.hasArg(options::OPT_mno_fmv) ||
+       getToolChain().GetRuntimeLibType(Args) != ToolChain::RLT_CompilerRT)) {
+    // Disable Function Multiversioning on AArch64 target.
+    CmdArgs.push_back("-target-feature");
+    CmdArgs.push_back("-fmv");
+  }
+
+  if (Args.hasFlag(options::OPT_faddrsig, options::OPT_fno_addrsig,
+                   (TC.getTriple().isOSBinFormatELF() ||
+                    TC.getTriple().isOSBinFormatCOFF()) &&
+                       !TC.getTriple().isPS4() && !TC.getTriple().isVE() &&
+                       !TC.getTriple().isOSNetBSD() &&
+                       !Distro(D.getVFS(), TC.getTriple()).IsGentoo() &&
+                       !TC.getTriple().isAndroid() && TC.useIntegratedAs()))
+    CmdArgs.push_back("-faddrsig");
+
+  if ((Triple.isOSBinFormatELF() || Triple.isOSBinFormatMachO()) &&
+      (EH || UnwindTables || AsyncUnwindTables ||
+       DebugInfoKind != codegenoptions::NoDebugInfo))
+    CmdArgs.push_back("-D__GCC_HAVE_DWARF2_CFI_ASM=1");
+
+  if (Arg *A = Args.getLastArg(options::OPT_fsymbol_partition_EQ)) {
+    std::string Str = A->getAsString(Args);
+    if (!TC.getTriple().isOSBinFormatELF())
+      D.Diag(diag::err_drv_unsupported_opt_for_target)
+          << Str << TC.getTripleString();
+    CmdArgs.push_back(Args.MakeArgString(Str));
+  }
+
+  // Add the output path to the object file for CodeView debug infos.
+  if (EmitCodeView && Output.isFilename())
+    addDebugObjectName(Args, CmdArgs, DebugCompilationDir,
+                       Output.getFilename());
+
+  // Add the "-o out -x type src.c" flags last. This is done primarily to make
+  // the -cc1 command easier to edit when reproducing compiler crashes.
+  if (Output.getType() == types::TY_Dependencies) {
+    // Handled with other dependency code.
+  } else if (Output.isFilename()) {
+    if (Output.getType() == clang::driver::types::TY_IFS_CPP ||
+        Output.getType() == clang::driver::types::TY_IFS) {
+      SmallString<128> OutputFilename(Output.getFilename());
+      llvm::sys::path::replace_extension(OutputFilename, "ifs");
+      CmdArgs.push_back("-o");
+      CmdArgs.push_back(Args.MakeArgString(OutputFilename));
+    } else {
+      CmdArgs.push_back("-o");
+      CmdArgs.push_back(Output.getFilename());
+    }
+  } else {
+    assert(Output.isNothing() && "Invalid output.");
+  }
+
+  addDashXForInput(Args, Input, CmdArgs);
+
+  ArrayRef<InputInfo> FrontendInputs = Input;
+  if (IsExtractAPI)
+    FrontendInputs = ExtractAPIInputs;
+  else if (Input.isNothing())
+    FrontendInputs = {};
+
+  for (const InputInfo &Input : FrontendInputs) {
+    if (Input.isFilename())
+      CmdArgs.push_back(Input.getFilename());
+    else
+      Input.getInputArg().renderAsInput(Args, CmdArgs);
+  }
+
+  if (D.CC1Main && !D.CCGenDiagnostics) {
+    // Invoke the CC1 directly in this process
+    C.addCommand(std::make_unique<CC1Command>(JA, *this,
+                                              ResponseFileSupport::AtFileUTF8(),
+                                              Exec, CmdArgs, Inputs, Output));
+  } else {
+    C.addCommand(std::make_unique<Command>(JA, *this,
+                                           ResponseFileSupport::AtFileUTF8(),
+                                           Exec, CmdArgs, Inputs, Output));
+  }
+
+  // Make the compile command echo its inputs for /showFilenames.
+  if (Output.getType() == types::TY_Object &&
+      Args.hasFlag(options::OPT__SLASH_showFilenames,
+                   options::OPT__SLASH_showFilenames_, false)) {
+    C.getJobs().getJobs().back()->PrintInputFilenames = true;
+  }
+
+  if (Arg *A = Args.getLastArg(options::OPT_pg))
+    if (FPKeepKind == CodeGenOptions::FramePointerKind::None &&
+        !Args.hasArg(options::OPT_mfentry))
+      D.Diag(diag::err_drv_argument_not_allowed_with) << "-fomit-frame-pointer"
+                                                      << A->getAsString(Args);
+
+  // Claim some arguments which clang supports automatically.
+
+  // -fpch-preprocess is used with gcc to add a special marker in the output to
+  // include the PCH file.
+  Args.ClaimAllArgs(options::OPT_fpch_preprocess);
+
+  // Claim some arguments which clang doesn't support, but we don't
+  // care to warn the user about.
+  Args.ClaimAllArgs(options::OPT_clang_ignored_f_Group);
+  Args.ClaimAllArgs(options::OPT_clang_ignored_m_Group);
+
+  // Disable warnings for clang -E -emit-llvm foo.c
+  Args.ClaimAllArgs(options::OPT_emit_llvm);
+}
+
+Clang::Clang(const ToolChain &TC, bool HasIntegratedBackend)
+    // CAUTION! The first constructor argument ("clang") is not arbitrary,
+    // as it is for other tools. Some operations on a Tool actually test
+    // whether that tool is Clang based on the Tool's Name as a string.
+    : Tool("clang", "clang frontend", TC), HasBackend(HasIntegratedBackend) {}
+
+Clang::~Clang() {}
+
+/// Add options related to the Objective-C runtime/ABI.
+///
+/// Returns true if the runtime is non-fragile.
+ObjCRuntime Clang::AddObjCRuntimeArgs(const ArgList &args,
+                                      const InputInfoList &inputs,
+                                      ArgStringList &cmdArgs,
+                                      RewriteKind rewriteKind) const {
+  // Look for the controlling runtime option.
+  Arg *runtimeArg =
+      args.getLastArg(options::OPT_fnext_runtime, options::OPT_fgnu_runtime,
+                      options::OPT_fobjc_runtime_EQ);
+
+  // Just forward -fobjc-runtime= to the frontend.  This supercedes
+  // options about fragility.
+  if (runtimeArg &&
+      runtimeArg->getOption().matches(options::OPT_fobjc_runtime_EQ)) {
+    ObjCRuntime runtime;
+    StringRef value = runtimeArg->getValue();
+    if (runtime.tryParse(value)) {
+      getToolChain().getDriver().Diag(diag::err_drv_unknown_objc_runtime)
+          << value;
+    }
+    if ((runtime.getKind() == ObjCRuntime::GNUstep) &&
+        (runtime.getVersion() >= VersionTuple(2, 0)))
+      if (!getToolChain().getTriple().isOSBinFormatELF() &&
+          !getToolChain().getTriple().isOSBinFormatCOFF()) {
+        getToolChain().getDriver().Diag(
+            diag::err_drv_gnustep_objc_runtime_incompatible_binary)
+          << runtime.getVersion().getMajor();
+      }
+
+    runtimeArg->render(args, cmdArgs);
+    return runtime;
+  }
+
+  // Otherwise, we'll need the ABI "version".  Version numbers are
+  // slightly confusing for historical reasons:
+  //   1 - Traditional "fragile" ABI
+  //   2 - Non-fragile ABI, version 1
+  //   3 - Non-fragile ABI, version 2
+  unsigned objcABIVersion = 1;
+  // If -fobjc-abi-version= is present, use that to set the version.
+  if (Arg *abiArg = args.getLastArg(options::OPT_fobjc_abi_version_EQ)) {
+    StringRef value = abiArg->getValue();
+    if (value == "1")
+      objcABIVersion = 1;
+    else if (value == "2")
+      objcABIVersion = 2;
+    else if (value == "3")
+      objcABIVersion = 3;
+    else
+      getToolChain().getDriver().Diag(diag::err_drv_clang_unsupported) << value;
+  } else {
+    // Otherwise, determine if we are using the non-fragile ABI.
+    bool nonFragileABIIsDefault =
+        (rewriteKind == RK_NonFragile ||
+         (rewriteKind == RK_None &&
+          getToolChain().IsObjCNonFragileABIDefault()));
+    if (args.hasFlag(options::OPT_fobjc_nonfragile_abi,
+                     options::OPT_fno_objc_nonfragile_abi,
+                     nonFragileABIIsDefault)) {
+// Determine the non-fragile ABI version to use.
+#ifdef DISABLE_DEFAULT_NONFRAGILEABI_TWO
+      unsigned nonFragileABIVersion = 1;
+#else
+      unsigned nonFragileABIVersion = 2;
+#endif
+
+      if (Arg *abiArg =
+              args.getLastArg(options::OPT_fobjc_nonfragile_abi_version_EQ)) {
+        StringRef value = abiArg->getValue();
+        if (value == "1")
+          nonFragileABIVersion = 1;
+        else if (value == "2")
+          nonFragileABIVersion = 2;
+        else
+          getToolChain().getDriver().Diag(diag::err_drv_clang_unsupported)
+              << value;
+      }
+
+      objcABIVersion = 1 + nonFragileABIVersion;
+    } else {
+      objcABIVersion = 1;
+    }
+  }
+
+  // We don't actually care about the ABI version other than whether
+  // it's non-fragile.
+  bool isNonFragile = objcABIVersion != 1;
+
+  // If we have no runtime argument, ask the toolchain for its default runtime.
+  // However, the rewriter only really supports the Mac runtime, so assume that.
+  ObjCRuntime runtime;
+  if (!runtimeArg) {
+    switch (rewriteKind) {
+    case RK_None:
+      runtime = getToolChain().getDefaultObjCRuntime(isNonFragile);
+      break;
+    case RK_Fragile:
+      runtime = ObjCRuntime(ObjCRuntime::FragileMacOSX, VersionTuple());
+      break;
+    case RK_NonFragile:
+      runtime = ObjCRuntime(ObjCRuntime::MacOSX, VersionTuple());
+      break;
+    }
+
+    // -fnext-runtime
+  } else if (runtimeArg->getOption().matches(options::OPT_fnext_runtime)) {
+    // On Darwin, make this use the default behavior for the toolchain.
+    if (getToolChain().getTriple().isOSDarwin()) {
+      runtime = getToolChain().getDefaultObjCRuntime(isNonFragile);
+
+      // Otherwise, build for a generic macosx port.
+    } else {
+      runtime = ObjCRuntime(ObjCRuntime::MacOSX, VersionTuple());
+    }
+
+    // -fgnu-runtime
+  } else {
+    assert(runtimeArg->getOption().matches(options::OPT_fgnu_runtime));
+    // Legacy behaviour is to target the gnustep runtime if we are in
+    // non-fragile mode or the GCC runtime in fragile mode.
+    if (isNonFragile)
+      runtime = ObjCRuntime(ObjCRuntime::GNUstep, VersionTuple(2, 0));
+    else
+      runtime = ObjCRuntime(ObjCRuntime::GCC, VersionTuple());
+  }
+
+  if (llvm::any_of(inputs, [](const InputInfo &input) {
+        return types::isObjC(input.getType());
+      }))
+    cmdArgs.push_back(
+        args.MakeArgString("-fobjc-runtime=" + runtime.getAsString()));
+  return runtime;
+}
+
+static bool maybeConsumeDash(const std::string &EH, size_t &I) {
+  bool HaveDash = (I + 1 < EH.size() && EH[I + 1] == '-');
+  I += HaveDash;
+  return !HaveDash;
+}
+
+namespace {
+struct EHFlags {
+  bool Synch = false;
+  bool Asynch = false;
+  bool NoUnwindC = false;
+};
+} // end anonymous namespace
+
+/// /EH controls whether to run destructor cleanups when exceptions are
+/// thrown.  There are three modifiers:
+/// - s: Cleanup after "synchronous" exceptions, aka C++ exceptions.
+/// - a: Cleanup after "asynchronous" exceptions, aka structured exceptions.
+///      The 'a' modifier is unimplemented and fundamentally hard in LLVM IR.
+/// - c: Assume that extern "C" functions are implicitly nounwind.
+/// The default is /EHs-c-, meaning cleanups are disabled.
+static EHFlags parseClangCLEHFlags(const Driver &D, const ArgList &Args) {
+  EHFlags EH;
+
+  std::vector<std::string> EHArgs =
+      Args.getAllArgValues(options::OPT__SLASH_EH);
+  for (auto EHVal : EHArgs) {
+    for (size_t I = 0, E = EHVal.size(); I != E; ++I) {
+      switch (EHVal[I]) {
+      case 'a':
+        EH.Asynch = maybeConsumeDash(EHVal, I);
+        if (EH.Asynch)
+          EH.Synch = false;
+        continue;
+      case 'c':
+        EH.NoUnwindC = maybeConsumeDash(EHVal, I);
+        continue;
+      case 's':
+        EH.Synch = maybeConsumeDash(EHVal, I);
+        if (EH.Synch)
+          EH.Asynch = false;
+        continue;
+      default:
+        break;
+      }
+      D.Diag(clang::diag::err_drv_invalid_value) << "/EH" << EHVal;
+      break;
+    }
+  }
+  // The /GX, /GX- flags are only processed if there are not /EH flags.
+  // The default is that /GX is not specified.
+  if (EHArgs.empty() &&
+      Args.hasFlag(options::OPT__SLASH_GX, options::OPT__SLASH_GX_,
+                   /*Default=*/false)) {
+    EH.Synch = true;
+    EH.NoUnwindC = true;
+  }
+
+  if (Args.hasArg(options::OPT__SLASH_kernel)) {
+    EH.Synch = false;
+    EH.NoUnwindC = false;
+    EH.Asynch = false;
+  }
+
+  return EH;
+}
+
+void Clang::AddClangCLArgs(const ArgList &Args, types::ID InputType,
+                           ArgStringList &CmdArgs,
+                           codegenoptions::DebugInfoKind *DebugInfoKind,
+                           bool *EmitCodeView) const {
+  bool isNVPTX = getToolChain().getTriple().isNVPTX();
+
+  ProcessVSRuntimeLibrary(Args, CmdArgs);
+
+  if (Arg *ShowIncludes =
+          Args.getLastArg(options::OPT__SLASH_showIncludes,
+                          options::OPT__SLASH_showIncludes_user)) {
+    CmdArgs.push_back("--show-includes");
+    if (ShowIncludes->getOption().matches(options::OPT__SLASH_showIncludes))
+      CmdArgs.push_back("-sys-header-deps");
+  }
+
+  // This controls whether or not we emit RTTI data for polymorphic types.
+  if (Args.hasFlag(options::OPT__SLASH_GR_, options::OPT__SLASH_GR,
+                   /*Default=*/false))
+    CmdArgs.push_back("-fno-rtti-data");
+
+  // This controls whether or not we emit stack-protector instrumentation.
+  // In MSVC, Buffer Security Check (/GS) is on by default.
+  if (!isNVPTX && Args.hasFlag(options::OPT__SLASH_GS, options::OPT__SLASH_GS_,
+                               /*Default=*/true)) {
+    CmdArgs.push_back("-stack-protector");
+    CmdArgs.push_back(Args.MakeArgString(Twine(LangOptions::SSPStrong)));
+  }
+
+  // Emit CodeView if -Z7 or -gline-tables-only are present.
+  if (Arg *DebugInfoArg = Args.getLastArg(options::OPT__SLASH_Z7,
+                                          options::OPT_gline_tables_only)) {
+    *EmitCodeView = true;
+    if (DebugInfoArg->getOption().matches(options::OPT__SLASH_Z7))
+      *DebugInfoKind = codegenoptions::DebugInfoConstructor;
+    else
+      *DebugInfoKind = codegenoptions::DebugLineTablesOnly;
+  } else {
+    *EmitCodeView = false;
+  }
+
+  const Driver &D = getToolChain().getDriver();
+
+  // This controls whether or not we perform JustMyCode instrumentation.
+  if (Args.hasFlag(options::OPT__SLASH_JMC, options::OPT__SLASH_JMC_,
+                   /*Default=*/false)) {
+    if (*EmitCodeView && *DebugInfoKind >= codegenoptions::DebugInfoConstructor)
+      CmdArgs.push_back("-fjmc");
+    else
+      D.Diag(clang::diag::warn_drv_jmc_requires_debuginfo) << "/JMC"
+                                                           << "'/Zi', '/Z7'";
+  }
+
+  EHFlags EH = parseClangCLEHFlags(D, Args);
+  if (!isNVPTX && (EH.Synch || EH.Asynch)) {
+    if (types::isCXX(InputType))
+      CmdArgs.push_back("-fcxx-exceptions");
+    CmdArgs.push_back("-fexceptions");
+  }
+  if (types::isCXX(InputType) && EH.Synch && EH.NoUnwindC)
+    CmdArgs.push_back("-fexternc-nounwind");
+
+  // /EP should expand to -E -P.
+  if (Args.hasArg(options::OPT__SLASH_EP)) {
+    CmdArgs.push_back("-E");
+    CmdArgs.push_back("-P");
+  }
+
+  unsigned VolatileOptionID;
+  if (getToolChain().getTriple().isX86())
+    VolatileOptionID = options::OPT__SLASH_volatile_ms;
+  else
+    VolatileOptionID = options::OPT__SLASH_volatile_iso;
+
+  if (Arg *A = Args.getLastArg(options::OPT__SLASH_volatile_Group))
+    VolatileOptionID = A->getOption().getID();
+
+  if (VolatileOptionID == options::OPT__SLASH_volatile_ms)
+    CmdArgs.push_back("-fms-volatile");
+
+ if (Args.hasFlag(options::OPT__SLASH_Zc_dllexportInlines_,
+                  options::OPT__SLASH_Zc_dllexportInlines,
+                  false)) {
+  CmdArgs.push_back("-fno-dllexport-inlines");
+ }
+
+ if (Args.hasFlag(options::OPT__SLASH_Zc_wchar_t_,
+                  options::OPT__SLASH_Zc_wchar_t, false)) {
+   CmdArgs.push_back("-fno-wchar");
+ }
+
+ if (Args.hasArg(options::OPT__SLASH_kernel)) {
+   llvm::Triple::ArchType Arch = getToolChain().getArch();
+   std::vector<std::string> Values =
+       Args.getAllArgValues(options::OPT__SLASH_arch);
+   if (!Values.empty()) {
+     llvm::SmallSet<std::string, 4> SupportedArches;
+     if (Arch == llvm::Triple::x86)
+       SupportedArches.insert("IA32");
+
+     for (auto &V : Values)
+       if (!SupportedArches.contains(V))
+         D.Diag(diag::err_drv_argument_not_allowed_with)
+             << std::string("/arch:").append(V) << "/kernel";
+   }
+
+   CmdArgs.push_back("-fno-rtti");
+   if (Args.hasFlag(options::OPT__SLASH_GR, options::OPT__SLASH_GR_, false))
+     D.Diag(diag::err_drv_argument_not_allowed_with) << "/GR"
+                                                     << "/kernel";
+ }
+
+  Arg *MostGeneralArg = Args.getLastArg(options::OPT__SLASH_vmg);
+  Arg *BestCaseArg = Args.getLastArg(options::OPT__SLASH_vmb);
+  if (MostGeneralArg && BestCaseArg)
+    D.Diag(clang::diag::err_drv_argument_not_allowed_with)
+        << MostGeneralArg->getAsString(Args) << BestCaseArg->getAsString(Args);
+
+  if (MostGeneralArg) {
+    Arg *SingleArg = Args.getLastArg(options::OPT__SLASH_vms);
+    Arg *MultipleArg = Args.getLastArg(options::OPT__SLASH_vmm);
+    Arg *VirtualArg = Args.getLastArg(options::OPT__SLASH_vmv);
+
+    Arg *FirstConflict = SingleArg ? SingleArg : MultipleArg;
+    Arg *SecondConflict = VirtualArg ? VirtualArg : MultipleArg;
+    if (FirstConflict && SecondConflict && FirstConflict != SecondConflict)
+      D.Diag(clang::diag::err_drv_argument_not_allowed_with)
+          << FirstConflict->getAsString(Args)
+          << SecondConflict->getAsString(Args);
+
+    if (SingleArg)
+      CmdArgs.push_back("-fms-memptr-rep=single");
+    else if (MultipleArg)
+      CmdArgs.push_back("-fms-memptr-rep=multiple");
+    else
+      CmdArgs.push_back("-fms-memptr-rep=virtual");
+  }
+
+  // Parse the default calling convention options.
+  if (Arg *CCArg =
+          Args.getLastArg(options::OPT__SLASH_Gd, options::OPT__SLASH_Gr,
+                          options::OPT__SLASH_Gz, options::OPT__SLASH_Gv,
+                          options::OPT__SLASH_Gregcall)) {
+    unsigned DCCOptId = CCArg->getOption().getID();
+    const char *DCCFlag = nullptr;
+    bool ArchSupported = !isNVPTX;
+    llvm::Triple::ArchType Arch = getToolChain().getArch();
+    switch (DCCOptId) {
+    case options::OPT__SLASH_Gd:
+      DCCFlag = "-fdefault-calling-conv=cdecl";
+      break;
+    case options::OPT__SLASH_Gr:
+      ArchSupported = Arch == llvm::Triple::x86;
+      DCCFlag = "-fdefault-calling-conv=fastcall";
+      break;
+    case options::OPT__SLASH_Gz:
+      ArchSupported = Arch == llvm::Triple::x86;
+      DCCFlag = "-fdefault-calling-conv=stdcall";
+      break;
+    case options::OPT__SLASH_Gv:
+      ArchSupported = Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64;
+      DCCFlag = "-fdefault-calling-conv=vectorcall";
+      break;
+    case options::OPT__SLASH_Gregcall:
+      ArchSupported = Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64;
+      DCCFlag = "-fdefault-calling-conv=regcall";
+      break;
+    }
+
+    // MSVC doesn't warn if /Gr or /Gz is used on x64, so we don't either.
+    if (ArchSupported && DCCFlag)
+      CmdArgs.push_back(DCCFlag);
+  }
+
+  Args.AddLastArg(CmdArgs, options::OPT_vtordisp_mode_EQ);
+
+  if (!Args.hasArg(options::OPT_fdiagnostics_format_EQ)) {
+    CmdArgs.push_back("-fdiagnostics-format");
+    CmdArgs.push_back("msvc");
+  }
+
+  if (Args.hasArg(options::OPT__SLASH_kernel))
+    CmdArgs.push_back("-fms-kernel");
+
+  if (Arg *A = Args.getLastArg(options::OPT__SLASH_guard)) {
+    StringRef GuardArgs = A->getValue();
+    // The only valid options are "cf", "cf,nochecks", "cf-", "ehcont" and
+    // "ehcont-".
+    if (GuardArgs.equals_insensitive("cf")) {
+      // Emit CFG instrumentation and the table of address-taken functions.
+      CmdArgs.push_back("-cfguard");
+    } else if (GuardArgs.equals_insensitive("cf,nochecks")) {
+      // Emit only the table of address-taken functions.
+      CmdArgs.push_back("-cfguard-no-checks");
+    } else if (GuardArgs.equals_insensitive("ehcont")) {
+      // Emit EH continuation table.
+      CmdArgs.push_back("-ehcontguard");
+    } else if (GuardArgs.equals_insensitive("cf-") ||
+               GuardArgs.equals_insensitive("ehcont-")) {
+      // Do nothing, but we might want to emit a security warning in future.
+    } else {
+      D.Diag(diag::err_drv_invalid_value) << A->getSpelling() << GuardArgs;
+    }
+  }
+}
+
+const char *Clang::getBaseInputName(const ArgList &Args,
+                                    const InputInfo &Input) {
+  return Args.MakeArgString(llvm::sys::path::filename(Input.getBaseInput()));
+}
+
+const char *Clang::getBaseInputStem(const ArgList &Args,
+                                    const InputInfoList &Inputs) {
+  const char *Str = getBaseInputName(Args, Inputs[0]);
+
+  if (const char *End = strrchr(Str, '.'))
+    return Args.MakeArgString(std::string(Str, End));
+
+  return Str;
+}
+
+const char *Clang::getDependencyFileName(const ArgList &Args,
+                                         const InputInfoList &Inputs) {
+  // FIXME: Think about this more.
+
+  if (Arg *OutputOpt = Args.getLastArg(options::OPT_o)) {
+    SmallString<128> OutputFilename(OutputOpt->getValue());
+    llvm::sys::path::replace_extension(OutputFilename, llvm::Twine('d'));
+    return Args.MakeArgString(OutputFilename);
+  }
+
+  return Args.MakeArgString(Twine(getBaseInputStem(Args, Inputs)) + ".d");
+}
+
+// Begin ClangAs
+
+void ClangAs::AddMIPSTargetArgs(const ArgList &Args,
+                                ArgStringList &CmdArgs) const {
+  StringRef CPUName;
+  StringRef ABIName;
+  const llvm::Triple &Triple = getToolChain().getTriple();
+  mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName);
+
+  CmdArgs.push_back("-target-abi");
+  CmdArgs.push_back(ABIName.data());
+}
+
+void ClangAs::AddX86TargetArgs(const ArgList &Args,
+                               ArgStringList &CmdArgs) const {
+  addX86AlignBranchArgs(getToolChain().getDriver(), Args, CmdArgs,
+                        /*IsLTO=*/false);
+
+  if (Arg *A = Args.getLastArg(options::OPT_masm_EQ)) {
+    StringRef Value = A->getValue();
+    if (Value == "intel" || Value == "att") {
+      CmdArgs.push_back("-mllvm");
+      CmdArgs.push_back(Args.MakeArgString("-x86-asm-syntax=" + Value));
+    } else {
+      getToolChain().getDriver().Diag(diag::err_drv_unsupported_option_argument)
+          << A->getSpelling() << Value;
+    }
+  }
+}
+
+void ClangAs::AddRISCVTargetArgs(const ArgList &Args,
+                               ArgStringList &CmdArgs) const {
+  const llvm::Triple &Triple = getToolChain().getTriple();
+  StringRef ABIName = riscv::getRISCVABI(Args, Triple);
+
+  CmdArgs.push_back("-target-abi");
+  CmdArgs.push_back(ABIName.data());
+}
+
+void ClangAs::ConstructJob(Compilation &C, const JobAction &JA,
+                           const InputInfo &Output, const InputInfoList &Inputs,
+                           const ArgList &Args,
+                           const char *LinkingOutput) const {
+  ArgStringList CmdArgs;
+
+  assert(Inputs.size() == 1 && "Unexpected number of inputs.");
+  const InputInfo &Input = Inputs[0];
+
+  const llvm::Triple &Triple = getToolChain().getEffectiveTriple();
+  const std::string &TripleStr = Triple.getTriple();
+  const auto &D = getToolChain().getDriver();
+
+  // Don't warn about "clang -w -c foo.s"
+  Args.ClaimAllArgs(options::OPT_w);
+  // and "clang -emit-llvm -c foo.s"
+  Args.ClaimAllArgs(options::OPT_emit_llvm);
+
+  claimNoWarnArgs(Args);
+
+  // Invoke ourselves in -cc1as mode.
+  //
+  // FIXME: Implement custom jobs for internal actions.
+  CmdArgs.push_back("-cc1as");
+
+  // Add the "effective" target triple.
+  CmdArgs.push_back("-triple");
+  CmdArgs.push_back(Args.MakeArgString(TripleStr));
+
+  getToolChain().addClangCC1ASTargetOptions(Args, CmdArgs);
+
+  // Set the output mode, we currently only expect to be used as a real
+  // assembler.
+  CmdArgs.push_back("-filetype");
+  CmdArgs.push_back("obj");
+
+  // Set the main file name, so that debug info works even with
+  // -save-temps or preprocessed assembly.
+  CmdArgs.push_back("-main-file-name");
+  CmdArgs.push_back(Clang::getBaseInputName(Args, Input));
+
+  // Add the target cpu
+  std::string CPU = getCPUName(D, Args, Triple, /*FromAs*/ true);
+  if (!CPU.empty()) {
+    CmdArgs.push_back("-target-cpu");
+    CmdArgs.push_back(Args.MakeArgString(CPU));
+  }
+
+  // Add the target features
+  getTargetFeatures(D, Triple, Args, CmdArgs, true);
+
+  // Ignore explicit -force_cpusubtype_ALL option.
+  (void)Args.hasArg(options::OPT_force__cpusubtype__ALL);
+
+  // Pass along any -I options so we get proper .include search paths.
+  Args.AddAllArgs(CmdArgs, options::OPT_I_Group);
+
+  // Determine the original source input.
+  auto FindSource = [](const Action *S) -> const Action * {
+    while (S->getKind() != Action::InputClass) {
+      assert(!S->getInputs().empty() && "unexpected root action!");
+      S = S->getInputs()[0];
+    }
+    return S;
+  };
+  const Action *SourceAction = FindSource(&JA);
+
+  // Forward -g and handle debug info related flags, assuming we are dealing
+  // with an actual assembly file.
+  bool WantDebug = false;
+  Args.ClaimAllArgs(options::OPT_g_Group);
+  if (Arg *A = Args.getLastArg(options::OPT_g_Group))
+    WantDebug = !A->getOption().matches(options::OPT_g0) &&
+                !A->getOption().matches(options::OPT_ggdb0);
+
+  codegenoptions::DebugInfoKind DebugInfoKind = codegenoptions::NoDebugInfo;
+
+  // Add the -fdebug-compilation-dir flag if needed.
+  const char *DebugCompilationDir =
+      addDebugCompDirArg(Args, CmdArgs, C.getDriver().getVFS());
+
+  if (SourceAction->getType() == types::TY_Asm ||
+      SourceAction->getType() == types::TY_PP_Asm) {
+    // You might think that it would be ok to set DebugInfoKind outside of
+    // the guard for source type, however there is a test which asserts
+    // that some assembler invocation receives no -debug-info-kind,
+    // and it's not clear whether that test is just overly restrictive.
+    DebugInfoKind = (WantDebug ? codegenoptions::DebugInfoConstructor
+                               : codegenoptions::NoDebugInfo);
+
+    addDebugPrefixMapArg(getToolChain().getDriver(), getToolChain(), Args,
+                         CmdArgs);
+
+    // Set the AT_producer to the clang version when using the integrated
+    // assembler on assembly source files.
+    CmdArgs.push_back("-dwarf-debug-producer");
+    CmdArgs.push_back(Args.MakeArgString(getClangFullVersion()));
+
+    // And pass along -I options
+    Args.AddAllArgs(CmdArgs, options::OPT_I);
+  }
+  const unsigned DwarfVersion = getDwarfVersion(getToolChain(), Args);
+  RenderDebugEnablingArgs(Args, CmdArgs, DebugInfoKind, DwarfVersion,
+                          llvm::DebuggerKind::Default);
+  renderDwarfFormat(D, Triple, Args, CmdArgs, DwarfVersion);
+  RenderDebugInfoCompressionArgs(Args, CmdArgs, D, getToolChain());
+
+  // Handle -fPIC et al -- the relocation-model affects the assembler
+  // for some targets.
+  llvm::Reloc::Model RelocationModel;
+  unsigned PICLevel;
+  bool IsPIE;
+  std::tie(RelocationModel, PICLevel, IsPIE) =
+      ParsePICArgs(getToolChain(), Args);
+
+  const char *RMName = RelocationModelName(RelocationModel);
+  if (RMName) {
+    CmdArgs.push_back("-mrelocation-model");
+    CmdArgs.push_back(RMName);
+  }
+
+  // Optionally embed the -cc1as level arguments into the debug info, for build
+  // analysis.
+  if (getToolChain().UseDwarfDebugFlags()) {
+    ArgStringList OriginalArgs;
+    for (const auto &Arg : Args)
+      Arg->render(Args, OriginalArgs);
+
+    SmallString<256> Flags;
+    const char *Exec = getToolChain().getDriver().getClangProgramPath();
+    EscapeSpacesAndBackslashes(Exec, Flags);
+    for (const char *OriginalArg : OriginalArgs) {
+      SmallString<128> EscapedArg;
+      EscapeSpacesAndBackslashes(OriginalArg, EscapedArg);
+      Flags += " ";
+      Flags += EscapedArg;
+    }
+    CmdArgs.push_back("-dwarf-debug-flags");
+    CmdArgs.push_back(Args.MakeArgString(Flags));
+  }
+
+  // FIXME: Add -static support, once we have it.
+
+  // Add target specific flags.
+  switch (getToolChain().getArch()) {
+  default:
+    break;
+
+  case llvm::Triple::mips:
+  case llvm::Triple::mipsel:
+  case llvm::Triple::mips64:
+  case llvm::Triple::mips64el:
+    AddMIPSTargetArgs(Args, CmdArgs);
+    break;
+
+  case llvm::Triple::x86:
+  case llvm::Triple::x86_64:
+    AddX86TargetArgs(Args, CmdArgs);
+    break;
+
+  case llvm::Triple::arm:
+  case llvm::Triple::armeb:
+  case llvm::Triple::thumb:
+  case llvm::Triple::thumbeb:
+    // This isn't in AddARMTargetArgs because we want to do this for assembly
+    // only, not C/C++.
+    if (Args.hasFlag(options::OPT_mdefault_build_attributes,
+                     options::OPT_mno_default_build_attributes, true)) {
+        CmdArgs.push_back("-mllvm");
+        CmdArgs.push_back("-arm-add-build-attributes");
+    }
+    break;
+
+  case llvm::Triple::aarch64:
+  case llvm::Triple::aarch64_32:
+  case llvm::Triple::aarch64_be:
+    if (Args.hasArg(options::OPT_mmark_bti_property)) {
+      CmdArgs.push_back("-mllvm");
+      CmdArgs.push_back("-aarch64-mark-bti-property");
+    }
+    break;
+
+  case llvm::Triple::riscv32:
+  case llvm::Triple::riscv64:
+    AddRISCVTargetArgs(Args, CmdArgs);
+    break;
+  }
+
+  // Consume all the warning flags. Usually this would be handled more
+  // gracefully by -cc1 (warning about unknown warning flags, etc) but -cc1as
+  // doesn't handle that so rather than warning about unused flags that are
+  // actually used, we'll lie by omission instead.
+  // FIXME: Stop lying and consume only the appropriate driver flags
+  Args.ClaimAllArgs(options::OPT_W_Group);
+
+  CollectArgsForIntegratedAssembler(C, Args, CmdArgs,
+                                    getToolChain().getDriver());
+
+  Args.AddAllArgs(CmdArgs, options::OPT_mllvm);
+
+  if (DebugInfoKind > codegenoptions::NoDebugInfo && Output.isFilename())
+    addDebugObjectName(Args, CmdArgs, DebugCompilationDir,
+                       Output.getFilename());
+
+  // Fixup any previous commands that use -object-file-name because when we
+  // generated them, the final .obj name wasn't yet known.
+  for (Command &J : C.getJobs()) {
+    if (SourceAction != FindSource(&J.getSource()))
+      continue;
+    auto &JArgs = J.getArguments();
+    for (unsigned I = 0; I < JArgs.size(); ++I) {
+      if (StringRef(JArgs[I]).startswith("-object-file-name=") &&
+          Output.isFilename()) {
+        ArgStringList NewArgs(JArgs.begin(), JArgs.begin() + I);
+        addDebugObjectName(Args, NewArgs, DebugCompilationDir,
+                           Output.getFilename());
+        NewArgs.append(JArgs.begin() + I + 1, JArgs.end());
+        J.replaceArguments(NewArgs);
+        break;
+      }
+    }
+  }
+
+  assert(Output.isFilename() && "Unexpected lipo output.");
+  CmdArgs.push_back("-o");
+  CmdArgs.push_back(Output.getFilename());
+
+  const llvm::Triple &T = getToolChain().getTriple();
+  Arg *A;
+  if (getDebugFissionKind(D, Args, A) == DwarfFissionKind::Split &&
+      T.isOSBinFormatELF()) {
+    CmdArgs.push_back("-split-dwarf-output");
+    CmdArgs.push_back(SplitDebugName(JA, Args, Input, Output));
+  }
+
+  if (Triple.isAMDGPU())
+    handleAMDGPUCodeObjectVersionOptions(D, Args, CmdArgs, /*IsCC1As=*/true);
+
+  assert(Input.isFilename() && "Invalid input.");
+  CmdArgs.push_back(Input.getFilename());
+
+  const char *Exec = getToolChain().getDriver().getClangProgramPath();
+  if (D.CC1Main && !D.CCGenDiagnostics) {
+    // Invoke cc1as directly in this process.
+    C.addCommand(std::make_unique<CC1Command>(JA, *this,
+                                              ResponseFileSupport::AtFileUTF8(),
+                                              Exec, CmdArgs, Inputs, Output));
+  } else {
+    C.addCommand(std::make_unique<Command>(JA, *this,
+                                           ResponseFileSupport::AtFileUTF8(),
+                                           Exec, CmdArgs, Inputs, Output));
+  }
+}
+
+// Begin OffloadBundler
+
+void OffloadBundler::ConstructJob(Compilation &C, const JobAction &JA,
+                                  const InputInfo &Output,
+                                  const InputInfoList &Inputs,
+                                  const llvm::opt::ArgList &TCArgs,
+                                  const char *LinkingOutput) const {
+  // The version with only one output is expected to refer to a bundling job.
+  assert(isa<OffloadBundlingJobAction>(JA) && "Expecting bundling job!");
+
+  // The bundling command looks like this:
+  // clang-offload-bundler -type=bc
+  //   -targets=host-triple,openmp-triple1,openmp-triple2
+  //   -output=output_file
+  //   -input=unbundle_file_host
+  //   -input=unbundle_file_tgt1
+  //   -input=unbundle_file_tgt2
+
+  ArgStringList CmdArgs;
+
+  // Get the type.
+  CmdArgs.push_back(TCArgs.MakeArgString(
+      Twine("-type=") + types::getTypeTempSuffix(Output.getType())));
+
+  assert(JA.getInputs().size() == Inputs.size() &&
+         "Not have inputs for all dependence actions??");
+
+  // Get the targets.
+  SmallString<128> Triples;
+  Triples += "-targets=";
+  for (unsigned I = 0; I < Inputs.size(); ++I) {
+    if (I)
+      Triples += ',';
+
+    // Find ToolChain for this input.
+    Action::OffloadKind CurKind = Action::OFK_Host;
+    const ToolChain *CurTC = &getToolChain();
+    const Action *CurDep = JA.getInputs()[I];
+
+    if (const auto *OA = dyn_cast<OffloadAction>(CurDep)) {
+      CurTC = nullptr;
+      OA->doOnEachDependence([&](Action *A, const ToolChain *TC, const char *) {
+        assert(CurTC == nullptr && "Expected one dependence!");
+        CurKind = A->getOffloadingDeviceKind();
+        CurTC = TC;
+      });
+    }
+    Triples += Action::GetOffloadKindName(CurKind);
+    Triples += '-';
+    Triples += CurTC->getTriple().normalize();
+    if ((CurKind == Action::OFK_HIP || CurKind == Action::OFK_Cuda) &&
+        !StringRef(CurDep->getOffloadingArch()).empty()) {
+      Triples += '-';
+      Triples += CurDep->getOffloadingArch();
+    }
+
+    // TODO: Replace parsing of -march flag. Can be done by storing GPUArch
+    //       with each toolchain.
+    StringRef GPUArchName;
+    if (CurKind == Action::OFK_OpenMP) {
+      // Extract GPUArch from -march argument in TC argument list.
+      for (unsigned ArgIndex = 0; ArgIndex < TCArgs.size(); ArgIndex++) {
+        auto ArchStr = StringRef(TCArgs.getArgString(ArgIndex));
+        auto Arch = ArchStr.startswith_insensitive("-march=");
+        if (Arch) {
+          GPUArchName = ArchStr.substr(7);
+          Triples += "-";
+          break;
+        }
+      }
+      Triples += GPUArchName.str();
+    }
+  }
+  CmdArgs.push_back(TCArgs.MakeArgString(Triples));
+
+  // Get bundled file command.
+  CmdArgs.push_back(
+      TCArgs.MakeArgString(Twine("-output=") + Output.getFilename()));
+
+  // Get unbundled files command.
+  for (unsigned I = 0; I < Inputs.size(); ++I) {
+    SmallString<128> UB;
+    UB += "-input=";
+
+    // Find ToolChain for this input.
+    const ToolChain *CurTC = &getToolChain();
+    if (const auto *OA = dyn_cast<OffloadAction>(JA.getInputs()[I])) {
+      CurTC = nullptr;
+      OA->doOnEachDependence([&](Action *, const ToolChain *TC, const char *) {
+        assert(CurTC == nullptr && "Expected one dependence!");
+        CurTC = TC;
+      });
+      UB += C.addTempFile(
+          C.getArgs().MakeArgString(CurTC->getInputFilename(Inputs[I])));
+    } else {
+      UB += CurTC->getInputFilename(Inputs[I]);
+    }
+    CmdArgs.push_back(TCArgs.MakeArgString(UB));
+  }
+  // All the inputs are encoded as commands.
+  C.addCommand(std::make_unique<Command>(
+      JA, *this, ResponseFileSupport::None(),
+      TCArgs.MakeArgString(getToolChain().GetProgramPath(getShortName())),
+      CmdArgs, std::nullopt, Output));
+}
+
+void OffloadBundler::ConstructJobMultipleOutputs(
+    Compilation &C, const JobAction &JA, const InputInfoList &Outputs,
+    const InputInfoList &Inputs, const llvm::opt::ArgList &TCArgs,
+    const char *LinkingOutput) const {
+  // The version with multiple outputs is expected to refer to a unbundling job.
+  auto &UA = cast<OffloadUnbundlingJobAction>(JA);
+
+  // The unbundling command looks like this:
+  // clang-offload-bundler -type=bc
+  //   -targets=host-triple,openmp-triple1,openmp-triple2
+  //   -input=input_file
+  //   -output=unbundle_file_host
+  //   -output=unbundle_file_tgt1
+  //   -output=unbundle_file_tgt2
+  //   -unbundle
+
+  ArgStringList CmdArgs;
+
+  assert(Inputs.size() == 1 && "Expecting to unbundle a single file!");
+  InputInfo Input = Inputs.front();
+
+  // Get the type.
+  CmdArgs.push_back(TCArgs.MakeArgString(
+      Twine("-type=") + types::getTypeTempSuffix(Input.getType())));
+
+  // Get the targets.
+  SmallString<128> Triples;
+  Triples += "-targets=";
+  auto DepInfo = UA.getDependentActionsInfo();
+  for (unsigned I = 0; I < DepInfo.size(); ++I) {
+    if (I)
+      Triples += ',';
+
+    auto &Dep = DepInfo[I];
+    Triples += Action::GetOffloadKindName(Dep.DependentOffloadKind);
+    Triples += '-';
+    Triples += Dep.DependentToolChain->getTriple().normalize();
+    if ((Dep.DependentOffloadKind == Action::OFK_HIP ||
+         Dep.DependentOffloadKind == Action::OFK_Cuda) &&
+        !Dep.DependentBoundArch.empty()) {
+      Triples += '-';
+      Triples += Dep.DependentBoundArch;
+    }
+    // TODO: Replace parsing of -march flag. Can be done by storing GPUArch
+    //       with each toolchain.
+    StringRef GPUArchName;
+    if (Dep.DependentOffloadKind == Action::OFK_OpenMP) {
+      // Extract GPUArch from -march argument in TC argument list.
+      for (unsigned ArgIndex = 0; ArgIndex < TCArgs.size(); ArgIndex++) {
+        StringRef ArchStr = StringRef(TCArgs.getArgString(ArgIndex));
+        auto Arch = ArchStr.startswith_insensitive("-march=");
+        if (Arch) {
+          GPUArchName = ArchStr.substr(7);
+          Triples += "-";
+          break;
+        }
+      }
+      Triples += GPUArchName.str();
+    }
+  }
+
+  CmdArgs.push_back(TCArgs.MakeArgString(Triples));
+
+  // Get bundled file command.
+  CmdArgs.push_back(
+      TCArgs.MakeArgString(Twine("-input=") + Input.getFilename()));
+
+  // Get unbundled files command.
+  for (unsigned I = 0; I < Outputs.size(); ++I) {
+    SmallString<128> UB;
+    UB += "-output=";
+    UB += DepInfo[I].DependentToolChain->getInputFilename(Outputs[I]);
+    CmdArgs.push_back(TCArgs.MakeArgString(UB));
+  }
+  CmdArgs.push_back("-unbundle");
+  CmdArgs.push_back("-allow-missing-bundles");
+
+  // All the inputs are encoded as commands.
+  C.addCommand(std::make_unique<Command>(
+      JA, *this, ResponseFileSupport::None(),
+      TCArgs.MakeArgString(getToolChain().GetProgramPath(getShortName())),
+      CmdArgs, std::nullopt, Outputs));
+}
+
+void OffloadPackager::ConstructJob(Compilation &C, const JobAction &JA,
+                                   const InputInfo &Output,
+                                   const InputInfoList &Inputs,
+                                   const llvm::opt::ArgList &Args,
+                                   const char *LinkingOutput) const {
+  ArgStringList CmdArgs;
+
+  // Add the output file name.
+  assert(Output.isFilename() && "Invalid output.");
+  CmdArgs.push_back("-o");
+  CmdArgs.push_back(Output.getFilename());
+
+  // Create the inputs to bundle the needed metadata.
+  for (const InputInfo &Input : Inputs) {
+    const Action *OffloadAction = Input.getAction();
+    const ToolChain *TC = OffloadAction->getOffloadingToolChain();
+    const ArgList &TCArgs =
+        C.getArgsForToolChain(TC, OffloadAction->getOffloadingArch(),
+                              OffloadAction->getOffloadingDeviceKind());
+    StringRef File = C.getArgs().MakeArgString(TC->getInputFilename(Input));
+    StringRef Arch = (OffloadAction->getOffloadingArch())
+                         ? OffloadAction->getOffloadingArch()
+                         : TCArgs.getLastArgValue(options::OPT_march_EQ);
+    StringRef Kind =
+      Action::GetOffloadKindName(OffloadAction->getOffloadingDeviceKind());
+
+    ArgStringList Features;
+    SmallVector<StringRef> FeatureArgs;
+    getTargetFeatures(TC->getDriver(), TC->getTriple(), TCArgs, Features,
+                      false);
+    llvm::copy_if(Features, std::back_inserter(FeatureArgs),
+                  [](StringRef Arg) { return !Arg.startswith("-target"); });
+
+    SmallVector<std::string> Parts{
+        "file=" + File.str(),
+        "triple=" + TC->getTripleString(),
+        "arch=" + Arch.str(),
+        "kind=" + Kind.str(),
+    };
+
+    if (TC->getDriver().isUsingLTO(/* IsOffload */ true))
+      for (StringRef Feature : FeatureArgs)
+        Parts.emplace_back("feature=" + Feature.str());
+
+    CmdArgs.push_back(Args.MakeArgString("--image=" + llvm::join(Parts, ",")));
+  }
+
+  C.addCommand(std::make_unique<Command>(
+      JA, *this, ResponseFileSupport::None(),
+      Args.MakeArgString(getToolChain().GetProgramPath(getShortName())),
+      CmdArgs, Inputs, Output));
+}
+
+void LinkerWrapper::ConstructJob(Compilation &C, const JobAction &JA,
+                                 const InputInfo &Output,
+                                 const InputInfoList &Inputs,
+                                 const ArgList &Args,
+                                 const char *LinkingOutput) const {
+  const Driver &D = getToolChain().getDriver();
+  const llvm::Triple TheTriple = getToolChain().getTriple();
+  ArgStringList CmdArgs;
+
+  // Pass the CUDA path to the linker wrapper tool.
+  for (Action::OffloadKind Kind : {Action::OFK_Cuda, Action::OFK_OpenMP}) {
+    auto TCRange = C.getOffloadToolChains(Kind);
+    for (auto &I : llvm::make_range(TCRange.first, TCRange.second)) {
+      const ToolChain *TC = I.second;
+      if (TC->getTriple().isNVPTX()) {
+        CudaInstallationDetector CudaInstallation(D, TheTriple, Args);
+        if (CudaInstallation.isValid())
+          CmdArgs.push_back(Args.MakeArgString(
+              "--cuda-path=" + CudaInstallation.getInstallPath()));
+        break;
+      }
+    }
+  }
+
+  if (D.isUsingLTO(/* IsOffload */ true)) {
+    // Pass in the optimization level to use for LTO.
+    if (const Arg *A = Args.getLastArg(options::OPT_O_Group)) {
+      StringRef OOpt;
+      if (A->getOption().matches(options::OPT_O4) ||
+          A->getOption().matches(options::OPT_Ofast))
+        OOpt = "3";
+      else if (A->getOption().matches(options::OPT_O)) {
+        OOpt = A->getValue();
+        if (OOpt == "g")
+          OOpt = "1";
+        else if (OOpt == "s" || OOpt == "z")
+          OOpt = "2";
+      } else if (A->getOption().matches(options::OPT_O0))
+        OOpt = "0";
+      if (!OOpt.empty())
+        CmdArgs.push_back(Args.MakeArgString(Twine("--opt-level=O") + OOpt));
+    }
+  }
+
+  CmdArgs.push_back(
+      Args.MakeArgString("--host-triple=" + TheTriple.getTriple()));
+  if (Args.hasArg(options::OPT_v))
+    CmdArgs.push_back("--wrapper-verbose");
+
+  if (const Arg *A = Args.getLastArg(options::OPT_g_Group)) {
+    if (!A->getOption().matches(options::OPT_g0))
+      CmdArgs.push_back("--device-debug");
+  }
+
+  for (const auto &A : Args.getAllArgValues(options::OPT_Xcuda_ptxas))
+    CmdArgs.push_back(Args.MakeArgString("--ptxas-arg=" + A));
+
+  // Forward remarks passes to the LLVM backend in the wrapper.
+  if (const Arg *A = Args.getLastArg(options::OPT_Rpass_EQ))
+    CmdArgs.push_back(Args.MakeArgString(Twine("--offload-opt=-pass-remarks=") +
+                                         A->getValue()));
+  if (const Arg *A = Args.getLastArg(options::OPT_Rpass_missed_EQ))
+    CmdArgs.push_back(Args.MakeArgString(
+        Twine("--offload-opt=-pass-remarks-missed=") + A->getValue()));
+  if (const Arg *A = Args.getLastArg(options::OPT_Rpass_analysis_EQ))
+    CmdArgs.push_back(Args.MakeArgString(
+        Twine("--offload-opt=-pass-remarks-analysis=") + A->getValue()));
+  if (Args.getLastArg(options::OPT_save_temps_EQ))
+    CmdArgs.push_back("--save-temps");
+
+  // Construct the link job so we can wrap around it.
+  Linker->ConstructJob(C, JA, Output, Inputs, Args, LinkingOutput);
+  const auto &LinkCommand = C.getJobs().getJobs().back();
+
+  // Forward -Xoffload-linker<-triple> arguments to the device link job.
+  for (Arg *A : Args.filtered(options::OPT_Xoffload_linker)) {
+    StringRef Val = A->getValue(0);
+    if (Val.empty())
+      CmdArgs.push_back(
+          Args.MakeArgString(Twine("--device-linker=") + A->getValue(1)));
+    else
+      CmdArgs.push_back(Args.MakeArgString(
+          "--device-linker=" +
+          ToolChain::getOpenMPTriple(Val.drop_front()).getTriple() + "=" +
+          A->getValue(1)));
+  }
+  Args.ClaimAllArgs(options::OPT_Xoffload_linker);
+
+  // Embed bitcode instead of an object in JIT mode.
+  if (Args.hasFlag(options::OPT_fopenmp_target_jit,
+                   options::OPT_fno_openmp_target_jit, false))
+    CmdArgs.push_back("--embed-bitcode");
+
+  // Forward `-mllvm` arguments to the LLVM invocations if present.
+  for (Arg *A : Args.filtered(options::OPT_mllvm)) {
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back(A->getValue());
+    A->claim();
+  }
+
+  // Add the linker arguments to be forwarded by the wrapper.
+  CmdArgs.push_back(Args.MakeArgString(Twine("--linker-path=") +
+                                       LinkCommand->getExecutable()));
+  CmdArgs.push_back("--");
+  for (const char *LinkArg : LinkCommand->getArguments())
+    CmdArgs.push_back(LinkArg);
+
+  const char *Exec =
+      Args.MakeArgString(getToolChain().GetProgramPath("clang-linker-wrapper"));
+
+  // Replace the executable and arguments of the link job with the
+  // wrapper.
+  LinkCommand->replaceExecutable(Exec);
+  LinkCommand->replaceArguments(CmdArgs);
+}