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diff --git a/include/__config b/include/__config
index ab696fb..6e3b0e3 100644
--- a/include/__config
+++ b/include/__config
@@ -28,13 +28,35 @@
# define _LIBCPP_GCC_VER (__GNUC__ * 100 + __GNUC_MINOR__)
#endif
+// Move outside #ifdef __cplusplus because this needs to work in both C and C++ headers.
+#if defined(__apple_build_version__)
+# define _LIBCPP_COMPILER_CLANG_BASED
+# define _LIBCPP_APPLE_CLANG_VER (__apple_build_version__ / 10000)
+#elif defined(__clang__)
+# define _LIBCPP_COMPILER_CLANG
+# define _LIBCPP_COMPILER_CLANG_BASED
+# define _LIBCPP_CLANG_VER (__clang_major__ * 100 + __clang_minor__)
+#elif defined(__GNUC__)
+# define _LIBCPP_COMPILER_GCC
+#elif defined(_MSC_VER)
+# define _LIBCPP_COMPILER_MSVC
+
+# if _MSVC_LANG == 201705L
+# define _LIBCPP_STD_VER 20
+# elif _MSVC_LANG == 201703L
+# define _LIBCPP_STD_VER 17
+# else
+# define _LIBCPP_STD_VER 14
+# endif
+#endif
+
#ifdef __cplusplus
// Warn if a compiler version is used that is not supported anymore
// LLVM RELEASE Update the minimum compiler versions
# if defined(_LIBCPP_CLANG_VER)
# if _LIBCPP_CLANG_VER < 1500
-# warning "Libc++ only supports Clang 15 and later"
+// we temporary allow old clang-s # warning "Libc++ only supports Clang 15 and later"
# endif
# elif defined(_LIBCPP_APPLE_CLANG_VER)
# if _LIBCPP_APPLE_CLANG_VER < 1500
@@ -87,7 +109,7 @@
# define _LIBCPP_OBJECT_FORMAT_ELF 1
# elif defined(__MACH__)
# define _LIBCPP_OBJECT_FORMAT_MACHO 1
-# elif defined(_WIN32)
+# elif defined(_WIN32) || defined(__CYGWIN__)
# define _LIBCPP_OBJECT_FORMAT_COFF 1
# elif defined(__wasm__)
# define _LIBCPP_OBJECT_FORMAT_WASM 1
@@ -771,7 +793,7 @@ typedef __char32_t char32_t;
// TODO: We provide a escape hatch with _LIBCPP_NO_ABI_TAG for folks who want to avoid increasing
// the length of symbols with an ABI tag. In practice, we should remove the escape hatch and
// use compression mangling instead, see https://github.com/itanium-cxx-abi/cxx-abi/issues/70.
-# ifndef _LIBCPP_NO_ABI_TAG
+# if !defined(_LIBCPP_NO_ABI_TAG) && !defined(__CUDACC__)
# define _LIBCPP_HIDE_FROM_ABI \
_LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION \
__attribute__((__abi_tag__(_LIBCPP_TOSTRING(_LIBCPP_VERSIONED_IDENTIFIER))))
@@ -1074,7 +1096,8 @@ __sanitizer_verify_double_ended_contiguous_container(const void*, const void*, c
defined(__APPLE__) || \
defined(__MVS__) || \
defined(_AIX) || \
- defined(__EMSCRIPTEN__)
+ defined(__EMSCRIPTEN__) || \
+ defined(__CYGWIN__)
// clang-format on
# define _LIBCPP_HAS_THREAD_API_PTHREAD
# elif defined(__Fuchsia__)
@@ -1210,6 +1233,10 @@ __sanitizer_verify_double_ended_contiguous_container(const void*, const void*, c
# define _LIBCPP_CONSTINIT
# endif
+# if !__has_builtin(__builtin_is_constant_evaluated) || (defined(_LIBCPP_COMPILER_GCC) && _GNUC_VER < 900) || __CUDACC_VER_MAJOR__ == 10
+# define _LIBCPP_HAS_NO_BUILTIN_IS_CONSTANT_EVALUATED
+# endif
+
# if __has_attribute(__diagnose_if__) && !defined(_LIBCPP_DISABLE_ADDITIONAL_DIAGNOSTICS)
# define _LIBCPP_DIAGNOSE_WARNING(...) __attribute__((__diagnose_if__(__VA_ARGS__, "warning")))
# else
@@ -1231,6 +1258,12 @@ __sanitizer_verify_double_ended_contiguous_container(const void*, const void*, c
# define _LIBCPP_LIFETIMEBOUND
# endif
+# if defined(_LIBCPP_COMPILER_CLANG_BASED)
+# define _LIBCPP_REINITIALIZES_OBJECT [[clang::reinitializes]]
+# else
+# define _LIBCPP_REINITIALIZES_OBJECT
+# endif
+
# if __has_attribute(__nodebug__)
# define _LIBCPP_NODEBUG __attribute__((__nodebug__))
# else
@@ -1288,6 +1321,10 @@ __sanitizer_verify_double_ended_contiguous_container(const void*, const void*, c
# define _LIBCPP_ENABLE_CXX20_REMOVED_TYPE_TRAITS
# endif // _LIBCPP_ENABLE_CXX20_REMOVED_FEATURES
+// Yandex-specific: We build our own libc++, so it has everything available
+# define _LIBCPP_DISABLE_AVAILABILITY
+// End of Yandex-specific
+
// clang-format off
# define _LIBCPP_PUSH_MACROS _Pragma("push_macro(\"min\")") _Pragma("push_macro(\"max\")") _Pragma("push_macro(\"refresh()\")") _Pragma("push_macro(\"move(int, int)\")") _Pragma("push_macro(\"erase()\")")
# define _LIBCPP_POP_MACROS _Pragma("pop_macro(\"min\")") _Pragma("pop_macro(\"max\")") _Pragma("pop_macro(\"refresh()\")") _Pragma("pop_macro(\"move(int, int)\")") _Pragma("pop_macro(\"erase()\")")
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