Update libcxx to 10 Oct 2023 dc129d6f715cf83a2072fc8de8b4e4c70bca6935

97ce40d276e44357a49b7a945af841896126dca8

23 files changed, 663 insertions, 511 deletions

diff --git a/contrib/libs/cxxsupp/libcxx/src/atomic.cpp b/contrib/libs/cxxsupp/libcxx/src/atomic.cpp
index a55249a15c..fc90a1f5b2 100644
--- a/contrib/libs/cxxsupp/libcxx/src/atomic.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/atomic.cpp
@@ -147,7 +147,7 @@ static void __libcpp_contention_notify(__cxx_atomic_contention_t volatile* __con
         // We only call 'wake' if we consumed a contention bit here.
         __libcpp_platform_wake_by_address(__platform_state, __notify_one);
 }
-static __cxx_contention_t __libcpp_contention_monitor_for_wait(__cxx_atomic_contention_t volatile* __contention_state,
+static __cxx_contention_t __libcpp_contention_monitor_for_wait(__cxx_atomic_contention_t volatile* /*__contention_state*/,
                                                                __cxx_atomic_contention_t const volatile* __platform_state)
 {
     // We will monitor this value.
diff --git a/contrib/libs/cxxsupp/libcxx/src/chrono.cpp b/contrib/libs/cxxsupp/libcxx/src/chrono.cpp
index f159613202..b31ef19c0a 100644
--- a/contrib/libs/cxxsupp/libcxx/src/chrono.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/chrono.cpp
@@ -99,7 +99,7 @@ static system_clock::time_point __libcpp_system_clock_now() {
                                                     nanoseconds::period>>;
 
   // The Windows epoch is Jan 1 1601, the Unix epoch Jan 1 1970.
-  static _LIBCPP_CONSTEXPR const seconds nt_to_unix_epoch{11644473600};
+  static constexpr const seconds nt_to_unix_epoch{11644473600};
 
   FILETIME ft;
 #if (_WIN32_WINNT >= _WIN32_WINNT_WIN8 && WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)) || \
diff --git a/contrib/libs/cxxsupp/libcxx/src/condition_variable.cpp b/contrib/libs/cxxsupp/libcxx/src/condition_variable.cpp
index 85f334e024..87ce1d8434 100644
--- a/contrib/libs/cxxsupp/libcxx/src/condition_variable.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/condition_variable.cpp
@@ -61,7 +61,7 @@ condition_variable::__do_timed_wait(unique_lock<mutex>& lk,
     __libcpp_timespec_t ts;
     seconds s = duration_cast<seconds>(d);
     typedef decltype(ts.tv_sec) ts_sec;
-    _LIBCPP_CONSTEXPR ts_sec ts_sec_max = numeric_limits<ts_sec>::max();
+    constexpr ts_sec ts_sec_max = numeric_limits<ts_sec>::max();
     if (s.count() < ts_sec_max)
     {
         ts.tv_sec = static_cast<ts_sec>(s.count());
diff --git a/contrib/libs/cxxsupp/libcxx/src/error_category.cpp b/contrib/libs/cxxsupp/libcxx/src/error_category.cpp
new file mode 100644
index 0000000000..8ae460fb5f
--- /dev/null
+++ b/contrib/libs/cxxsupp/libcxx/src/error_category.cpp
@@ -0,0 +1,37 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 <__config>
+
+#ifdef _LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS
+#  define _LIBCPP_ERROR_CATEGORY_DEFINE_LEGACY_INLINE_FUNCTIONS
+#endif
+
+#include <system_error>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+// class error_category
+
+#if defined(_LIBCPP_ERROR_CATEGORY_DEFINE_LEGACY_INLINE_FUNCTIONS)
+error_category::error_category() noexcept {}
+#endif
+
+error_category::~error_category() noexcept {}
+
+error_condition error_category::default_error_condition(int ev) const noexcept { return error_condition(ev, *this); }
+
+bool error_category::equivalent(int code, const error_condition& condition) const noexcept {
+  return default_error_condition(code) == condition;
+}
+
+bool error_category::equivalent(const error_code& code, int condition) const noexcept {
+  return *this == code.category() && code.value() == condition;
+}
+
+_LIBCPP_END_NAMESPACE_STD
diff --git a/contrib/libs/cxxsupp/libcxx/src/filesystem/error.h b/contrib/libs/cxxsupp/libcxx/src/filesystem/error.h
index 965e0eadcd..93da758761 100644
--- a/contrib/libs/cxxsupp/libcxx/src/filesystem/error.h
+++ b/contrib/libs/cxxsupp/libcxx/src/filesystem/error.h
@@ -112,7 +112,7 @@ inline error_code make_windows_error(int err) {
 template <class T>
 T error_value();
 template <>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX14 void error_value<void>() {}
+inline constexpr void error_value<void>() {}
 template <>
 inline bool error_value<bool>() {
   return false;
@@ -128,7 +128,7 @@ inline uintmax_t error_value<uintmax_t>() {
   return uintmax_t(-1);
 }
 template <>
-inline _LIBCPP_CONSTEXPR_SINCE_CXX14 file_time_type error_value<file_time_type>() {
+inline constexpr file_time_type error_value<file_time_type>() {
   return file_time_type::min();
 }
 template <>
diff --git a/contrib/libs/cxxsupp/libcxx/src/filesystem/posix_compat.h b/contrib/libs/cxxsupp/libcxx/src/filesystem/posix_compat.h
index f11f41552e..fb213d9ec1 100644
--- a/contrib/libs/cxxsupp/libcxx/src/filesystem/posix_compat.h
+++ b/contrib/libs/cxxsupp/libcxx/src/filesystem/posix_compat.h
@@ -322,8 +322,8 @@ inline int statvfs(const wchar_t *p, StatVFS *buf) {
 
 inline wchar_t* getcwd([[maybe_unused]] wchar_t* in_buf, [[maybe_unused]] size_t in_size) {
   // Only expected to be used with us allocating the buffer.
-  _LIBCPP_ASSERT(in_buf == nullptr, "Windows getcwd() assumes in_buf==nullptr");
-  _LIBCPP_ASSERT(in_size == 0, "Windows getcwd() assumes in_size==0");
+  _LIBCPP_ASSERT_UNCATEGORIZED(in_buf == nullptr, "Windows getcwd() assumes in_buf==nullptr");
+  _LIBCPP_ASSERT_UNCATEGORIZED(in_size == 0, "Windows getcwd() assumes in_size==0");
 
   size_t buff_size = MAX_PATH + 10;
   std::unique_ptr<wchar_t, decltype(&::free)> buff(static_cast<wchar_t*>(malloc(buff_size * sizeof(wchar_t))), &::free);
diff --git a/contrib/libs/cxxsupp/libcxx/src/filesystem/time_utils.h b/contrib/libs/cxxsupp/libcxx/src/filesystem/time_utils.h
index 9177e1013d..eb41769368 100644
--- a/contrib/libs/cxxsupp/libcxx/src/filesystem/time_utils.h
+++ b/contrib/libs/cxxsupp/libcxx/src/filesystem/time_utils.h
@@ -147,7 +147,7 @@ struct time_util_base {
           .count();
 
 private:
-  static _LIBCPP_CONSTEXPR fs_duration get_min_nsecs() {
+  static constexpr fs_duration get_min_nsecs() {
     return duration_cast<fs_duration>(
         fs_nanoseconds(min_nsec_timespec) -
         duration_cast<fs_nanoseconds>(fs_seconds(1)));
@@ -157,7 +157,7 @@ private:
                     FileTimeT::duration::min(),
                 "value doesn't roundtrip");
 
-  static _LIBCPP_CONSTEXPR_SINCE_CXX14 bool check_range() {
+  static constexpr bool check_range() {
     // This kinda sucks, but it's what happens when we don't have __int128_t.
     if (sizeof(TimeT) == sizeof(rep)) {
       typedef duration<long long, ratio<3600 * 24 * 365> > Years;
@@ -225,7 +225,7 @@ struct time_util : time_util_base<FileTimeT, TimeT> {
 
 public:
   template <class CType, class ChronoType>
-  static _LIBCPP_CONSTEXPR_SINCE_CXX14 bool checked_set(CType* out,
+  static constexpr bool checked_set(CType* out,
                                                         ChronoType time) {
     using Lim = numeric_limits<CType>;
     if (time > Lim::max() || time < Lim::min())
@@ -234,7 +234,7 @@ public:
     return true;
   }
 
-  static _LIBCPP_CONSTEXPR_SINCE_CXX14 bool is_representable(TimeSpecT tm) {
+  static constexpr bool is_representable(TimeSpecT tm) {
     if (tm.tv_sec >= 0) {
       return tm.tv_sec < max_seconds ||
              (tm.tv_sec == max_seconds && tm.tv_nsec <= max_nsec);
@@ -245,7 +245,7 @@ public:
     }
   }
 
-  static _LIBCPP_CONSTEXPR_SINCE_CXX14 bool is_representable(FileTimeT tm) {
+  static constexpr bool is_representable(FileTimeT tm) {
     auto secs = duration_cast<fs_seconds>(tm.time_since_epoch());
     auto nsecs = duration_cast<fs_nanoseconds>(tm.time_since_epoch() - secs);
     if (nsecs.count() < 0) {
@@ -258,7 +258,7 @@ public:
     return secs.count() >= TLim::min();
   }
 
-  static _LIBCPP_CONSTEXPR_SINCE_CXX14 FileTimeT
+  static constexpr FileTimeT
   convert_from_timespec(TimeSpecT tm) {
     if (tm.tv_sec >= 0 || tm.tv_nsec == 0) {
       return FileTimeT(fs_seconds(tm.tv_sec) +
@@ -272,7 +272,7 @@ public:
   }
 
   template <class SubSecT>
-  static _LIBCPP_CONSTEXPR_SINCE_CXX14 bool
+  static constexpr bool
   set_times_checked(TimeT* sec_out, SubSecT* subsec_out, FileTimeT tp) {
     auto dur = tp.time_since_epoch();
     auto sec_dur = duration_cast<fs_seconds>(dur);
@@ -289,7 +289,7 @@ public:
     return checked_set(sec_out, sec_dur.count()) &&
            checked_set(subsec_out, subsec_dur.count());
   }
-  static _LIBCPP_CONSTEXPR_SINCE_CXX14 bool convert_to_timespec(TimeSpecT& dest,
+  static constexpr bool convert_to_timespec(TimeSpecT& dest,
                                                                 FileTimeT tp) {
     if (!is_representable(tp))
       return false;
diff --git a/contrib/libs/cxxsupp/libcxx/src/future.cpp b/contrib/libs/cxxsupp/libcxx/src/future.cpp
index f8f466bd5a..3383b506a2 100644
--- a/contrib/libs/cxxsupp/libcxx/src/future.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/future.cpp
@@ -59,8 +59,13 @@ _LIBCPP_DIAGNOSTIC_POP
 const error_category&
 future_category() noexcept
 {
-    static __future_error_category __f;
-    return __f;
+    union AvoidDestroyingFutureCategory {
+        __future_error_category future_error_category;
+        constexpr explicit AvoidDestroyingFutureCategory() : future_error_category() {}
+        ~AvoidDestroyingFutureCategory() {}
+    };
+    constinit static AvoidDestroyingFutureCategory helper;
+    return helper.future_error_category;
 }
 
 future_error::future_error(error_code __ec)
@@ -199,9 +204,7 @@ promise<void>::~promise()
     {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
         if (!__state_->__has_value() && __state_->use_count() > 1)
-            __state_->set_exception(make_exception_ptr(
-                      future_error(make_error_code(future_errc::broken_promise))
-                                                      ));
+            __state_->set_exception(make_exception_ptr(future_error(future_errc::broken_promise)));
 #endif // _LIBCPP_HAS_NO_EXCEPTIONS
         __state_->__release_shared();
     }
diff --git a/contrib/libs/cxxsupp/libcxx/src/ios.cpp b/contrib/libs/cxxsupp/libcxx/src/ios.cpp
index bb62eb9948..f17cd6e1db 100644
--- a/contrib/libs/cxxsupp/libcxx/src/ios.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/ios.cpp
@@ -52,8 +52,13 @@ __iostream_category::message(int ev) const
 const error_category&
 iostream_category() noexcept
 {
-    static __iostream_category s;
-    return s;
+    union AvoidDestroyingIostreamCategory {
+        __iostream_category iostream_error_category;
+        constexpr explicit AvoidDestroyingIostreamCategory() : iostream_error_category() {}
+        ~AvoidDestroyingIostreamCategory() {}
+    };
+    constinit static AvoidDestroyingIostreamCategory helper;
+    return helper.iostream_error_category;
 }
 
 // ios_base::failure
diff --git a/contrib/libs/cxxsupp/libcxx/src/locale.cpp b/contrib/libs/cxxsupp/libcxx/src/locale.cpp
index e274ede995..071edb903a 100644
--- a/contrib/libs/cxxsupp/libcxx/src/locale.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/locale.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 #include <__utility/unreachable.h>
-#include <__verbose_abort>
 #include <algorithm>
 #include <clocale>
 #include <codecvt>
@@ -38,8 +37,8 @@
 #   include <langinfo.h>
 #endif
 
-#include "atomic"
 #include "include/sso_allocator.h"
+#include <mutex>
 
 // On Linux, wint_t and wchar_t have different signed-ness, and this causes
 // lots of noise in the build log, but no bugs that I know of.
@@ -95,7 +94,7 @@ T& make(Args ...args)
 
 template <typename T, size_t N>
 inline
-_LIBCPP_CONSTEXPR
+constexpr
 size_t
 countof(const T (&)[N])
 {
@@ -104,22 +103,13 @@ countof(const T (&)[N])
 
 template <typename T>
 inline
-_LIBCPP_CONSTEXPR
+constexpr
 size_t
 countof(const T * const begin, const T * const end)
 {
     return static_cast<size_t>(end - begin);
 }
 
-_LIBCPP_NORETURN static void __throw_runtime_error(const string &msg)
-{
-#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
-    throw runtime_error(msg);
-#else
-    _LIBCPP_VERBOSE_ABORT("runtime_error was thrown in -fno-exceptions mode with message \"%s\"", msg.c_str());
-#endif
-}
-
 }
 
 string
@@ -698,30 +688,9 @@ locale::facet::__on_zero_shared() noexcept
 
 // locale::id
 
-namespace
-{
-
-class __fake_bind
-{
-    locale::id* id_;
-    void (locale::id::* pmf_)();
-public:
-    __fake_bind(void (locale::id::* pmf)(), locale::id* id)
-        : id_(id), pmf_(pmf) {}
-
-    void operator()() const
-    {
-        (id_->*pmf_)();
-    }
-};
-
-}
-
-int32_t locale::id::__next_id;
+constinit int32_t locale::id::__next_id = 0;
 
-long
-locale::id::__get()
-{
+long locale::id::__get() {
     int32_t result = __id_.load(std::memory_order_acquire);
     if (result == 0) {
         static std::mutex m;
@@ -742,8 +711,8 @@ collate_byname<char>::collate_byname(const char* n, size_t refs)
       __l_(newlocale(LC_ALL_MASK, n, 0))
 {
     if (__l_ == 0)
-        __throw_runtime_error("collate_byname<char>::collate_byname"
-                            " failed to construct for " + string(n));
+        __throw_runtime_error(("collate_byname<char>::collate_byname"
+                               " failed to construct for " + string(n)).c_str());
 }
 
 collate_byname<char>::collate_byname(const string& name, size_t refs)
@@ -751,8 +720,8 @@ collate_byname<char>::collate_byname(const string& name, size_t refs)
       __l_(newlocale(LC_ALL_MASK, name.c_str(), 0))
 {
     if (__l_ == 0)
-        __throw_runtime_error("collate_byname<char>::collate_byname"
-                            " failed to construct for " + name);
+        __throw_runtime_error(("collate_byname<char>::collate_byname"
+                               " failed to construct for " + name).c_str());
 }
 
 collate_byname<char>::~collate_byname()
@@ -791,8 +760,8 @@ collate_byname<wchar_t>::collate_byname(const char* n, size_t refs)
       __l_(newlocale(LC_ALL_MASK, n, 0))
 {
     if (__l_ == 0)
-        __throw_runtime_error("collate_byname<wchar_t>::collate_byname(size_t refs)"
-                            " failed to construct for " + string(n));
+        __throw_runtime_error(("collate_byname<wchar_t>::collate_byname(size_t refs)"
+                               " failed to construct for " + string(n)).c_str());
 }
 
 collate_byname<wchar_t>::collate_byname(const string& name, size_t refs)
@@ -800,8 +769,8 @@ collate_byname<wchar_t>::collate_byname(const string& name, size_t refs)
       __l_(newlocale(LC_ALL_MASK, name.c_str(), 0))
 {
     if (__l_ == 0)
-        __throw_runtime_error("collate_byname<wchar_t>::collate_byname(size_t refs)"
-                            " failed to construct for " + name);
+        __throw_runtime_error(("collate_byname<wchar_t>::collate_byname(size_t refs)"
+                               " failed to construct for " + name).c_str());
 }
 
 collate_byname<wchar_t>::~collate_byname()
@@ -849,7 +818,7 @@ const ctype_base::mask ctype_base::graph;
 // template <> class ctype<wchar_t>;
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
-locale::id ctype<wchar_t>::id;
+constinit locale::id ctype<wchar_t>::id;
 
 ctype<wchar_t>::~ctype()
 {
@@ -982,7 +951,7 @@ ctype<wchar_t>::do_narrow(const char_type* low, const char_type* high, char dfau
 
 // template <> class ctype<char>;
 
-locale::id ctype<char>::id;
+constinit locale::id ctype<char>::id;
 
 const size_t ctype<char>::table_size;
 
@@ -1115,7 +1084,7 @@ extern "C" const unsigned short* const _ctype_android;
 const ctype<char>::mask*
 ctype<char>::classic_table() noexcept
 {
-    static _LIBCPP_CONSTEXPR const ctype<char>::mask builtin_table[table_size] = {
+    static constexpr const ctype<char>::mask builtin_table[table_size] = {
         cntrl,                          cntrl,
         cntrl,                          cntrl,
         cntrl,                          cntrl,
@@ -1294,8 +1263,8 @@ ctype_byname<char>::ctype_byname(const char* name, size_t refs)
       __l_(newlocale(LC_ALL_MASK, name, 0))
 {
     if (__l_ == 0)
-        __throw_runtime_error("ctype_byname<char>::ctype_byname"
-                            " failed to construct for " + string(name));
+        __throw_runtime_error(("ctype_byname<char>::ctype_byname"
+                               " failed to construct for " + string(name)).c_str());
 }
 
 ctype_byname<char>::ctype_byname(const string& name, size_t refs)
@@ -1303,8 +1272,8 @@ ctype_byname<char>::ctype_byname(const string& name, size_t refs)
       __l_(newlocale(LC_ALL_MASK, name.c_str(), 0))
 {
     if (__l_ == 0)
-        __throw_runtime_error("ctype_byname<char>::ctype_byname"
-                            " failed to construct for " + name);
+        __throw_runtime_error(("ctype_byname<char>::ctype_byname"
+                               " failed to construct for " + name).c_str());
 }
 
 ctype_byname<char>::~ctype_byname()
@@ -1348,8 +1317,8 @@ ctype_byname<wchar_t>::ctype_byname(const char* name, size_t refs)
       __l_(newlocale(LC_ALL_MASK, name, 0))
 {
     if (__l_ == 0)
-        __throw_runtime_error("ctype_byname<wchar_t>::ctype_byname"
-                            " failed to construct for " + string(name));
+        __throw_runtime_error(("ctype_byname<wchar_t>::ctype_byname"
+                               " failed to construct for " + string(name)).c_str());
 }
 
 ctype_byname<wchar_t>::ctype_byname(const string& name, size_t refs)
@@ -1357,8 +1326,8 @@ ctype_byname<wchar_t>::ctype_byname(const string& name, size_t refs)
       __l_(newlocale(LC_ALL_MASK, name.c_str(), 0))
 {
     if (__l_ == 0)
-        __throw_runtime_error("ctype_byname<wchar_t>::ctype_byname"
-                            " failed to construct for " + name);
+        __throw_runtime_error(("ctype_byname<wchar_t>::ctype_byname"
+                               " failed to construct for " + name).c_str());
 }
 
 ctype_byname<wchar_t>::~ctype_byname()
@@ -1544,7 +1513,7 @@ ctype_byname<wchar_t>::do_narrow(const char_type* low, const char_type* high, ch
 
 // template <> class codecvt<char, char, mbstate_t>
 
-locale::id codecvt<char, char, mbstate_t>::id;
+constinit locale::id codecvt<char, char, mbstate_t>::id;
 
 codecvt<char, char, mbstate_t>::~codecvt()
 {
@@ -1606,7 +1575,7 @@ codecvt<char, char, mbstate_t>::do_max_length() const noexcept
 // template <> class codecvt<wchar_t, char, mbstate_t>
 
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
-locale::id codecvt<wchar_t, char, mbstate_t>::id;
+constinit locale::id codecvt<wchar_t, char, mbstate_t>::id;
 
 codecvt<wchar_t, char, mbstate_t>::codecvt(size_t refs)
     : locale::facet(refs),
@@ -1619,8 +1588,8 @@ codecvt<wchar_t, char, mbstate_t>::codecvt(const char* nm, size_t refs)
       __l_(newlocale(LC_ALL_MASK, nm, 0))
 {
     if (__l_ == 0)
-        __throw_runtime_error("codecvt_byname<wchar_t, char, mbstate_t>::codecvt_byname"
-                            " failed to construct for " + string(nm));
+        __throw_runtime_error(("codecvt_byname<wchar_t, char, mbstate_t>::codecvt_byname"
+                               " failed to construct for " + string(nm)).c_str());
 }
 
 codecvt<wchar_t, char, mbstate_t>::~codecvt()
@@ -3212,7 +3181,7 @@ _LIBCPP_SUPPRESS_DEPRECATED_POP
 
 // template <> class codecvt<char16_t, char, mbstate_t>
 
-locale::id codecvt<char16_t, char, mbstate_t>::id;
+constinit locale::id codecvt<char16_t, char, mbstate_t>::id;
 
 codecvt<char16_t, char, mbstate_t>::~codecvt()
 {
@@ -3291,7 +3260,7 @@ codecvt<char16_t, char, mbstate_t>::do_max_length() const noexcept
 
 // template <> class codecvt<char16_t, char8_t, mbstate_t>
 
-locale::id codecvt<char16_t, char8_t, mbstate_t>::id;
+constinit locale::id codecvt<char16_t, char8_t, mbstate_t>::id;
 
 codecvt<char16_t, char8_t, mbstate_t>::~codecvt()
 {
@@ -3370,7 +3339,7 @@ codecvt<char16_t, char8_t, mbstate_t>::do_max_length() const noexcept
 
 // template <> class codecvt<char32_t, char, mbstate_t>
 
-locale::id codecvt<char32_t, char, mbstate_t>::id;
+constinit locale::id codecvt<char32_t, char, mbstate_t>::id;
 
 codecvt<char32_t, char, mbstate_t>::~codecvt()
 {
@@ -3449,7 +3418,7 @@ codecvt<char32_t, char, mbstate_t>::do_max_length() const noexcept
 
 // template <> class codecvt<char32_t, char8_t, mbstate_t>
 
-locale::id codecvt<char32_t, char8_t, mbstate_t>::id;
+constinit locale::id codecvt<char32_t, char8_t, mbstate_t>::id;
 
 codecvt<char32_t, char8_t, mbstate_t>::~codecvt()
 {
@@ -4665,9 +4634,9 @@ static bool checked_string_to_char_convert(char& dest,
 
 // numpunct<char> && numpunct<wchar_t>
 
-locale::id numpunct< char  >::id;
+constinit locale::id numpunct<char>::id;
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
-locale::id numpunct<wchar_t>::id;
+constinit locale::id numpunct<wchar_t>::id;
 #endif
 
 numpunct<char>::numpunct(size_t refs)
@@ -4747,8 +4716,8 @@ numpunct_byname<char>::__init(const char* nm)
     {
         __libcpp_unique_locale loc(nm);
         if (!loc)
-            __throw_runtime_error("numpunct_byname<char>::numpunct_byname"
-                                " failed to construct for " + string(nm));
+            __throw_runtime_error(("numpunct_byname<char>::numpunct_byname"
+                                   " failed to construct for " + string(nm)).c_str());
 
         lconv* lc = __libcpp_localeconv_l(loc.get());
         if (!checked_string_to_char_convert(__decimal_point_, lc->decimal_point,
@@ -4788,8 +4757,8 @@ numpunct_byname<wchar_t>::__init(const char* nm)
     {
         __libcpp_unique_locale loc(nm);
         if (!loc)
-            __throw_runtime_error("numpunct_byname<wchar_t>::numpunct_byname"
-                                " failed to construct for " + string(nm));
+            __throw_runtime_error(("numpunct_byname<wchar_t>::numpunct_byname"
+                                   " failed to construct for " + string(nm)).c_str());
 
         lconv* lc = __libcpp_localeconv_l(loc.get());
         checked_string_to_wchar_convert(__decimal_point_, lc->decimal_point,
@@ -5220,16 +5189,14 @@ __time_get::__time_get(const char* nm)
     : __loc_(newlocale(LC_ALL_MASK, nm, 0))
 {
     if (__loc_ == 0)
-        __throw_runtime_error("time_get_byname"
-                            " failed to construct for " + string(nm));
+        __throw_runtime_error(("time_get_byname failed to construct for " + string(nm)).c_str());
 }
 
 __time_get::__time_get(const string& nm)
     : __loc_(newlocale(LC_ALL_MASK, nm.c_str(), 0))
 {
     if (__loc_ == 0)
-        __throw_runtime_error("time_get_byname"
-                            " failed to construct for " + nm);
+        __throw_runtime_error(("time_get_byname failed to construct for " + nm).c_str());
 }
 
 __time_get::~__time_get()
@@ -5878,16 +5845,14 @@ __time_put::__time_put(const char* nm)
     : __loc_(newlocale(LC_ALL_MASK, nm, 0))
 {
     if (__loc_ == 0)
-        __throw_runtime_error("time_put_byname"
-                            " failed to construct for " + string(nm));
+        __throw_runtime_error(("time_put_byname failed to construct for " + string(nm)).c_str());
 }
 
 __time_put::__time_put(const string& nm)
     : __loc_(newlocale(LC_ALL_MASK, nm.c_str(), 0))
 {
     if (__loc_ == 0)
-        __throw_runtime_error("time_put_byname"
-                            " failed to construct for " + nm);
+        __throw_runtime_error(("time_put_byname failed to construct for " + nm).c_str());
 }
 
 __time_put::~__time_put()
@@ -6305,8 +6270,7 @@ moneypunct_byname<char, false>::init(const char* nm)
     typedef moneypunct<char, false> base;
     __libcpp_unique_locale loc(nm);
     if (!loc)
-        __throw_runtime_error("moneypunct_byname"
-                            " failed to construct for " + string(nm));
+        __throw_runtime_error(("moneypunct_byname failed to construct for " + string(nm)).c_str());
 
     lconv* lc = __libcpp_localeconv_l(loc.get());
     if (!checked_string_to_char_convert(__decimal_point_,
@@ -6349,8 +6313,7 @@ moneypunct_byname<char, true>::init(const char* nm)
     typedef moneypunct<char, true> base;
     __libcpp_unique_locale loc(nm);
     if (!loc)
-        __throw_runtime_error("moneypunct_byname"
-                            " failed to construct for " + string(nm));
+        __throw_runtime_error(("moneypunct_byname failed to construct for " + string(nm)).c_str());
 
     lconv* lc = __libcpp_localeconv_l(loc.get());
     if (!checked_string_to_char_convert(__decimal_point_,
@@ -6410,8 +6373,7 @@ moneypunct_byname<wchar_t, false>::init(const char* nm)
     typedef moneypunct<wchar_t, false> base;
     __libcpp_unique_locale loc(nm);
     if (!loc)
-        __throw_runtime_error("moneypunct_byname"
-                            " failed to construct for " + string(nm));
+        __throw_runtime_error(("moneypunct_byname failed to construct for " + string(nm)).c_str());
     lconv* lc = __libcpp_localeconv_l(loc.get());
     if (!checked_string_to_wchar_convert(__decimal_point_,
                                          lc->mon_decimal_point,
@@ -6475,8 +6437,7 @@ moneypunct_byname<wchar_t, true>::init(const char* nm)
     typedef moneypunct<wchar_t, true> base;
     __libcpp_unique_locale loc(nm);
     if (!loc)
-        __throw_runtime_error("moneypunct_byname"
-                            " failed to construct for " + string(nm));
+        __throw_runtime_error(("moneypunct_byname failed to construct for " + string(nm)).c_str());
 
     lconv* lc = __libcpp_localeconv_l(loc.get());
     if (!checked_string_to_wchar_convert(__decimal_point_,
@@ -6554,15 +6515,6 @@ moneypunct_byname<wchar_t, true>::init(const char* nm)
 
 void __do_nothing(void*) {}
 
-void __throw_runtime_error(const char* msg)
-{
-#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
-    throw runtime_error(msg);
-#else
-    _LIBCPP_VERBOSE_ABORT("runtime_error was thrown in -fno-exceptions mode with message \"%s\"", msg);
-#endif
-}
-
                            template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS collate<char>;
 _LIBCPP_IF_WIDE_CHARACTERS(template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS collate<wchar_t>;)
 
diff --git a/contrib/libs/cxxsupp/libcxx/src/memory.cpp b/contrib/libs/cxxsupp/libcxx/src/memory.cpp
index 4682f1267a..e318eee327 100644
--- a/contrib/libs/cxxsupp/libcxx/src/memory.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/memory.cpp
@@ -181,7 +181,7 @@ static constinit __libcpp_mutex_t mut_back[__sp_mut_count] =
     _LIBCPP_MUTEX_INITIALIZER, _LIBCPP_MUTEX_INITIALIZER, _LIBCPP_MUTEX_INITIALIZER, _LIBCPP_MUTEX_INITIALIZER
 };
 
-_LIBCPP_CONSTEXPR __sp_mut::__sp_mut(void* p) noexcept
+constexpr __sp_mut::__sp_mut(void* p) noexcept
    : __lx_(p)
 {
 }
diff --git a/contrib/libs/cxxsupp/libcxx/src/memory_resource.cpp b/contrib/libs/cxxsupp/libcxx/src/memory_resource.cpp
index 3a80b84efa..3786ec5136 100644
--- a/contrib/libs/cxxsupp/libcxx/src/memory_resource.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/memory_resource.cpp
@@ -74,7 +74,7 @@ union ResourceInitHelper {
     __null_memory_resource_imp null_res;
   } resources;
   char dummy;
-  _LIBCPP_CONSTEXPR_SINCE_CXX14 ResourceInitHelper() : resources() {}
+  constexpr ResourceInitHelper() : resources() {}
   ~ResourceInitHelper() {}
 };
 
diff --git a/contrib/libs/cxxsupp/libcxx/src/mutex.cpp b/contrib/libs/cxxsupp/libcxx/src/mutex.cpp
index e304b97e6e..e8637f9275 100644
--- a/contrib/libs/cxxsupp/libcxx/src/mutex.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/mutex.cpp
@@ -8,6 +8,7 @@
 
 #include <__assert>
 #include <__thread/id.h>
+#include <__utility/exception_guard.h>
 #include <limits>
 #include <mutex>
 
@@ -212,68 +213,52 @@ void __call_once(volatile once_flag::_State_type& flag, void* arg,
 #endif
 {
 #if defined(_LIBCPP_HAS_NO_THREADS)
-    if (flag == 0)
-    {
-#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
-        try
-        {
-#endif // _LIBCPP_HAS_NO_EXCEPTIONS
-            flag = 1;
-            func(arg);
-            flag = ~once_flag::_State_type(0);
-#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
-        }
-        catch (...)
-        {
-            flag = 0;
-            throw;
-        }
-#endif // _LIBCPP_HAS_NO_EXCEPTIONS
+
+    if (flag == once_flag::_Unset) {
+        auto guard = std::__make_exception_guard([&flag] { flag = once_flag::_Unset; });
+        flag = once_flag::_Pending;
+        func(arg);
+        flag = once_flag::_Complete;
+        guard.__complete();
     }
+
 #else // !_LIBCPP_HAS_NO_THREADS
+
     __libcpp_mutex_lock(&mut);
-    while (flag == 1)
+    while (flag == once_flag::_Pending)
         __libcpp_condvar_wait(&cv, &mut);
-    if (flag == 0)
-    {
-#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
-        try
-        {
-#endif // _LIBCPP_HAS_NO_EXCEPTIONS
+    if (flag == once_flag::_Unset) {
+        auto guard = std::__make_exception_guard([&flag] {
+            __libcpp_mutex_lock(&mut);
 #ifdef _LIBCPP_ABI_MICROSOFT
-            flag.store(once_flag::_State_type(1));
+            flag.store(once_flag::_Unset);
 #else
-            __libcpp_relaxed_store(&flag, once_flag::_State_type(1));
+            __libcpp_relaxed_store(&flag, once_flag::_Unset);
 #endif
             __libcpp_mutex_unlock(&mut);
-            func(arg);
-            __libcpp_mutex_lock(&mut);
+            __libcpp_condvar_broadcast(&cv);
+        });
+
 #ifdef _LIBCPP_ABI_MICROSOFT
-            flag.store(~once_flag::_State_type(0), memory_order_release);
+        flag.store(once_flag::_Pending, memory_order_relaxed);
 #else
-            __libcpp_atomic_store(&flag, ~once_flag::_State_type(0),
-                                  _AO_Release);
+        __libcpp_relaxed_store(&flag, once_flag::_Pending);
 #endif
-            __libcpp_mutex_unlock(&mut);
-            __libcpp_condvar_broadcast(&cv);
-#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
-        }
-        catch (...)
-        {
-            __libcpp_mutex_lock(&mut);
+        __libcpp_mutex_unlock(&mut);
+        func(arg);
+        __libcpp_mutex_lock(&mut);
 #ifdef _LIBCPP_ABI_MICROSOFT
-            flag.store(once_flag::_State_type(0), memory_order_relaxed);
+        flag.store(once_flag::_Complete, memory_order_release);
 #else
-            __libcpp_relaxed_store(&flag, once_flag::_State_type(0));
+        __libcpp_atomic_store(&flag, once_flag::_Complete, _AO_Release);
 #endif
-            __libcpp_mutex_unlock(&mut);
-            __libcpp_condvar_broadcast(&cv);
-            throw;
-        }
-#endif // _LIBCPP_HAS_NO_EXCEPTIONS
-    }
-    else
         __libcpp_mutex_unlock(&mut);
+        __libcpp_condvar_broadcast(&cv);
+        guard.__complete();
+    } else {
+        __libcpp_mutex_unlock(&mut);
+    }
+
 #endif // !_LIBCPP_HAS_NO_THREADS
 }
 
diff --git a/contrib/libs/cxxsupp/libcxx/src/new_helpers.cpp b/contrib/libs/cxxsupp/libcxx/src/new_helpers.cpp
index 45a0a661db..6560d0188e 100644
--- a/contrib/libs/cxxsupp/libcxx/src/new_helpers.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/new_helpers.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include <cstdlib>
+#include <__verbose_abort>
 #include <new>
 
 namespace std { // purposefully not versioned
@@ -21,7 +21,7 @@ void __throw_bad_alloc() {
 #  ifndef _LIBCPP_HAS_NO_EXCEPTIONS
   throw bad_alloc();
 #  else
-  std::abort();
+  _LIBCPP_VERBOSE_ABORT("bad_alloc was thrown in -fno-exceptions mode");
 #  endif
 }
 
diff --git a/contrib/libs/cxxsupp/libcxx/src/print.cpp b/contrib/libs/cxxsupp/libcxx/src/print.cpp
index 3d8a4c291e..a581dd37fe 100644
--- a/contrib/libs/cxxsupp/libcxx/src/print.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/print.cpp
@@ -47,12 +47,7 @@ __write_to_windows_console([[maybe_unused]] FILE* __stream, [[maybe_unused]] wst
                     __view.size(),
                     nullptr,
                     nullptr) == 0) {
-#    ifndef _LIBCPP_HAS_NO_EXCEPTIONS
-    // There is no __throw_system_error overload that takes an error code.
-    throw system_error{filesystem::detail::make_windows_error(GetLastError()), "failed to write formatted output"};
-#    else  // _LIBCPP_HAS_NO_EXCEPTIONS
-    std::abort();
-#    endif // _LIBCPP_HAS_NO_EXCEPTIONS
+    __throw_system_error(filesystem::detail::make_windows_error(GetLastError()), "failed to write formatted output");
   }
 }
 #  endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
diff --git a/contrib/libs/cxxsupp/libcxx/src/std_stream.h b/contrib/libs/cxxsupp/libcxx/src/std_stream.h
index 0febf42c9f..37b4ffd1b4 100644
--- a/contrib/libs/cxxsupp/libcxx/src/std_stream.h
+++ b/contrib/libs/cxxsupp/libcxx/src/std_stream.h
@@ -113,7 +113,7 @@ __stdinbuf<_CharT>::uflow()
     return __getchar(true);
 }
 
-static bool __do_getc(FILE *__fp, char *__pbuf) {
+inline bool __do_getc(FILE *__fp, char *__pbuf) {
     int __c = getc(__fp);
     if (__c == EOF)
         return false;
@@ -121,7 +121,7 @@ static bool __do_getc(FILE *__fp, char *__pbuf) {
     return true;
 }
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
-static bool __do_getc(FILE *__fp, wchar_t *__pbuf) {
+inline bool __do_getc(FILE *__fp, wchar_t *__pbuf) {
     wint_t __c = getwc(__fp);
     if (__c == WEOF)
         return false;
@@ -130,13 +130,13 @@ static bool __do_getc(FILE *__fp, wchar_t *__pbuf) {
 }
 #endif
 
-static bool __do_ungetc(int __c, FILE *__fp, char __dummy) {
+inline bool __do_ungetc(int __c, FILE *__fp, char __dummy) {
     if (ungetc(__c, __fp) == EOF)
         return false;
     return true;
 }
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
-static bool __do_ungetc(std::wint_t __c, FILE *__fp, wchar_t __dummy) {
+inline bool __do_ungetc(std::wint_t __c, FILE *__fp, wchar_t __dummy) {
     if (ungetwc(__c, __fp) == WEOF)
         return false;
     return true;
@@ -324,13 +324,13 @@ __stdoutbuf<_CharT>::__stdoutbuf(FILE* __fp, state_type* __st)
         __always_noconv_ = true;
 }
 
-static bool __do_fputc(char __c, FILE* __fp) {
+inline bool __do_fputc(char __c, FILE* __fp) {
     if (fwrite(&__c, sizeof(__c), 1, __fp) != 1)
         return false;
     return true;
 }
 #ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
-static bool __do_fputc(wchar_t __c, FILE* __fp) {
+inline bool __do_fputc(wchar_t __c, FILE* __fp) {
     // fputwc works regardless of wide/narrow mode of stdout, while
     // fwrite of wchar_t only works if the stream actually has been set
     // into wide mode.
diff --git a/contrib/libs/cxxsupp/libcxx/src/stdexcept.cpp b/contrib/libs/cxxsupp/libcxx/src/stdexcept.cpp
index d5c9173576..bc25c0f9e6 100644
--- a/contrib/libs/cxxsupp/libcxx/src/stdexcept.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/stdexcept.cpp
@@ -6,12 +6,25 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include <__verbose_abort>
 #include <new>
 #include <stdexcept>
 #include <string>
 
 #ifdef _LIBCPP_ABI_VCRUNTIME
-#include "support/runtime/stdexcept_vcruntime.ipp"
+#  include "support/runtime/stdexcept_vcruntime.ipp"
 #else
-#include "support/runtime/stdexcept_default.ipp"
+#  include "support/runtime/stdexcept_default.ipp"
 #endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+_LIBCPP_NORETURN void __throw_runtime_error(const char* msg) {
+#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
+  throw runtime_error(msg);
+#else
+  _LIBCPP_VERBOSE_ABORT("runtime_error was thrown in -fno-exceptions mode with message \"%s\"", msg);
+#endif
+}
+
+_LIBCPP_END_NAMESPACE_STD
diff --git a/contrib/libs/cxxsupp/libcxx/src/strstream.cpp b/contrib/libs/cxxsupp/libcxx/src/strstream.cpp
index bc56cafa8f..c97db698c0 100644
--- a/contrib/libs/cxxsupp/libcxx/src/strstream.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/strstream.cpp
@@ -20,321 +20,239 @@ _LIBCPP_PUSH_MACROS
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 strstreambuf::strstreambuf(streamsize __alsize)
-    : __strmode_(__dynamic),
-      __alsize_(__alsize),
-      __palloc_(nullptr),
-      __pfree_(nullptr)
-{
-}
+    : __strmode_(__dynamic), __alsize_(__alsize), __palloc_(nullptr), __pfree_(nullptr) {}
 
 strstreambuf::strstreambuf(void* (*__palloc)(size_t), void (*__pfree)(void*))
-    : __strmode_(__dynamic),
-      __alsize_(__default_alsize),
-      __palloc_(__palloc),
-      __pfree_(__pfree)
-{
-}
+    : __strmode_(__dynamic), __alsize_(__default_alsize), __palloc_(__palloc), __pfree_(__pfree) {}
 
-void
-strstreambuf::__init(char* __gnext, streamsize __n, char* __pbeg)
-{
-    if (__n == 0)
-        __n = static_cast<streamsize>(strlen(__gnext));
-    else if (__n < 0)
-        __n = INT_MAX;
-    if (__pbeg == nullptr)
-        setg(__gnext, __gnext, __gnext + __n);
-    else
-    {
-        setg(__gnext, __gnext, __pbeg);
-        setp(__pbeg, __pbeg + __n);
-    }
+void strstreambuf::__init(char* __gnext, streamsize __n, char* __pbeg) {
+  if (__n == 0)
+    __n = static_cast<streamsize>(strlen(__gnext));
+  else if (__n < 0)
+    __n = INT_MAX;
+  if (__pbeg == nullptr)
+    setg(__gnext, __gnext, __gnext + __n);
+  else {
+    setg(__gnext, __gnext, __pbeg);
+    setp(__pbeg, __pbeg + __n);
+  }
 }
 
 strstreambuf::strstreambuf(char* __gnext, streamsize __n, char* __pbeg)
-    : __strmode_(),
-      __alsize_(__default_alsize),
-      __palloc_(nullptr),
-      __pfree_(nullptr)
-{
-    __init(__gnext, __n, __pbeg);
+    : __strmode_(), __alsize_(__default_alsize), __palloc_(nullptr), __pfree_(nullptr) {
+  __init(__gnext, __n, __pbeg);
 }
 
 strstreambuf::strstreambuf(const char* __gnext, streamsize __n)
-    : __strmode_(__constant),
-      __alsize_(__default_alsize),
-      __palloc_(nullptr),
-      __pfree_(nullptr)
-{
-    __init(const_cast<char *>(__gnext), __n, nullptr);
+    : __strmode_(__constant), __alsize_(__default_alsize), __palloc_(nullptr), __pfree_(nullptr) {
+  __init(const_cast<char*>(__gnext), __n, nullptr);
 }
 
 strstreambuf::strstreambuf(signed char* __gnext, streamsize __n, signed char* __pbeg)
-    : __strmode_(),
-      __alsize_(__default_alsize),
-      __palloc_(nullptr),
-      __pfree_(nullptr)
-{
-    __init(const_cast<char *>(reinterpret_cast<const char*>(__gnext)), __n, reinterpret_cast<char*>(__pbeg));
+    : __strmode_(), __alsize_(__default_alsize), __palloc_(nullptr), __pfree_(nullptr) {
+  __init(const_cast<char*>(reinterpret_cast<const char*>(__gnext)), __n, reinterpret_cast<char*>(__pbeg));
 }
 
 strstreambuf::strstreambuf(const signed char* __gnext, streamsize __n)
-    : __strmode_(__constant),
-      __alsize_(__default_alsize),
-      __palloc_(nullptr),
-      __pfree_(nullptr)
-{
-    __init(const_cast<char *>(reinterpret_cast<const char*>(__gnext)), __n, nullptr);
+    : __strmode_(__constant), __alsize_(__default_alsize), __palloc_(nullptr), __pfree_(nullptr) {
+  __init(const_cast<char*>(reinterpret_cast<const char*>(__gnext)), __n, nullptr);
 }
 
 strstreambuf::strstreambuf(unsigned char* __gnext, streamsize __n, unsigned char* __pbeg)
-    : __strmode_(),
-      __alsize_(__default_alsize),
-      __palloc_(nullptr),
-      __pfree_(nullptr)
-{
-    __init(const_cast<char *>(reinterpret_cast<const char*>(__gnext)), __n, reinterpret_cast<char*>(__pbeg));
+    : __strmode_(), __alsize_(__default_alsize), __palloc_(nullptr), __pfree_(nullptr) {
+  __init(const_cast<char*>(reinterpret_cast<const char*>(__gnext)), __n, reinterpret_cast<char*>(__pbeg));
 }
 
 strstreambuf::strstreambuf(const unsigned char* __gnext, streamsize __n)
-    : __strmode_(__constant),
-      __alsize_(__default_alsize),
-      __palloc_(nullptr),
-      __pfree_(nullptr)
-{
-    __init(const_cast<char *>(reinterpret_cast<const char*>(__gnext)), __n, nullptr);
-}
-
-strstreambuf::~strstreambuf()
-{
-    if (eback() && (__strmode_ & __allocated) != 0 && (__strmode_ & __frozen) == 0)
-    {
-        if (__pfree_)
-            __pfree_(eback());
-        else
-            delete [] eback();
-    }
+    : __strmode_(__constant), __alsize_(__default_alsize), __palloc_(nullptr), __pfree_(nullptr) {
+  __init(const_cast<char*>(reinterpret_cast<const char*>(__gnext)), __n, nullptr);
 }
 
-void
-strstreambuf::swap(strstreambuf& __rhs)
-{
-    streambuf::swap(__rhs);
-    _VSTD::swap(__strmode_, __rhs.__strmode_);
-    _VSTD::swap(__alsize_, __rhs.__alsize_);
-    _VSTD::swap(__palloc_, __rhs.__palloc_);
-    _VSTD::swap(__pfree_, __rhs.__pfree_);
+strstreambuf::~strstreambuf() {
+  if (eback() && (__strmode_ & __allocated) != 0 && (__strmode_ & __frozen) == 0) {
+    if (__pfree_)
+      __pfree_(eback());
+    else
+      delete[] eback();
+  }
 }
 
-void
-strstreambuf::freeze(bool __freezefl)
-{
-    if (__strmode_ & __dynamic)
-    {
-        if (__freezefl)
-            __strmode_ |= __frozen;
-        else
-            __strmode_ &= ~__frozen;
-    }
+void strstreambuf::swap(strstreambuf& __rhs) {
+  streambuf::swap(__rhs);
+  _VSTD::swap(__strmode_, __rhs.__strmode_);
+  _VSTD::swap(__alsize_, __rhs.__alsize_);
+  _VSTD::swap(__palloc_, __rhs.__palloc_);
+  _VSTD::swap(__pfree_, __rhs.__pfree_);
 }
 
-char*
-strstreambuf::str()
-{
-    if (__strmode_ & __dynamic)
-        __strmode_ |= __frozen;
-    return eback();
+void strstreambuf::freeze(bool __freezefl) {
+  if (__strmode_ & __dynamic) {
+    if (__freezefl)
+      __strmode_ |= __frozen;
+    else
+      __strmode_ &= ~__frozen;
+  }
 }
 
-int
-strstreambuf::pcount() const
-{
-    return static_cast<int>(pptr() - pbase());
+char* strstreambuf::str() {
+  if (__strmode_ & __dynamic)
+    __strmode_ |= __frozen;
+  return eback();
 }
 
-strstreambuf::int_type
-strstreambuf::overflow(int_type __c)
-{
-    if (__c == EOF)
-        return int_type(0);
-    if (pptr() == epptr())
-    {
-        if ((__strmode_ & __dynamic) == 0 || (__strmode_ & __frozen) != 0)
-            return int_type(EOF);
-        size_t old_size = static_cast<size_t> ((epptr() ? epptr() : egptr()) - eback());
-        size_t new_size = max<size_t>(static_cast<size_t>(__alsize_), 2*old_size);
-        if (new_size == 0)
-            new_size = __default_alsize;
-        char* buf = nullptr;
-        if (__palloc_)
-            buf = static_cast<char*>(__palloc_(new_size));
-        else
-            buf = new char[new_size];
-        if (buf == nullptr)
-            return int_type(EOF);
-        if (old_size != 0) {
-            _LIBCPP_ASSERT_UNCATEGORIZED(eback(), "overflow copying from NULL");
-            memcpy(buf, eback(), static_cast<size_t>(old_size));
-        }
-        ptrdiff_t ninp = gptr()  - eback();
-        ptrdiff_t einp = egptr() - eback();
-        ptrdiff_t nout = pptr()  - pbase();
-        if (__strmode_ & __allocated)
-        {
-            if (__pfree_)
-                __pfree_(eback());
-            else
-                delete [] eback();
-        }
-        setg(buf, buf + ninp, buf + einp);
-        setp(buf + einp, buf + new_size);
-        __pbump(nout);
-        __strmode_ |= __allocated;
-    }
-    *pptr() = static_cast<char>(__c);
-    pbump(1);
-    return int_type(static_cast<unsigned char>(__c));
-}
+int strstreambuf::pcount() const { return static_cast<int>(pptr() - pbase()); }
 
-strstreambuf::int_type
-strstreambuf::pbackfail(int_type __c)
-{
-    if (eback() == gptr())
-        return EOF;
-    if (__c == EOF)
-    {
-        gbump(-1);
-        return int_type(0);
+strstreambuf::int_type strstreambuf::overflow(int_type __c) {
+  if (__c == EOF)
+    return int_type(0);
+  if (pptr() == epptr()) {
+    if ((__strmode_ & __dynamic) == 0 || (__strmode_ & __frozen) != 0)
+      return int_type(EOF);
+    size_t old_size = static_cast<size_t>((epptr() ? epptr() : egptr()) - eback());
+    size_t new_size = max<size_t>(static_cast<size_t>(__alsize_), 2 * old_size);
+    if (new_size == 0)
+      new_size = __default_alsize;
+    char* buf = nullptr;
+    if (__palloc_)
+      buf = static_cast<char*>(__palloc_(new_size));
+    else
+      buf = new char[new_size];
+    if (buf == nullptr)
+      return int_type(EOF);
+    if (old_size != 0) {
+      _LIBCPP_ASSERT_UNCATEGORIZED(eback(), "overflow copying from NULL");
+      memcpy(buf, eback(), static_cast<size_t>(old_size));
     }
-    if (__strmode_ & __constant)
-    {
-        if (gptr()[-1] == static_cast<char>(__c))
-        {
-            gbump(-1);
-            return __c;
-        }
-        return EOF;
+    ptrdiff_t ninp = gptr() - eback();
+    ptrdiff_t einp = egptr() - eback();
+    ptrdiff_t nout = pptr() - pbase();
+    if (__strmode_ & __allocated) {
+      if (__pfree_)
+        __pfree_(eback());
+      else
+        delete[] eback();
     }
-    gbump(-1);
-    *gptr() = static_cast<char>(__c);
-    return __c;
+    setg(buf, buf + ninp, buf + einp);
+    setp(buf + einp, buf + new_size);
+    __pbump(nout);
+    __strmode_ |= __allocated;
+  }
+  *pptr() = static_cast<char>(__c);
+  pbump(1);
+  return int_type(static_cast<unsigned char>(__c));
 }
 
-strstreambuf::int_type
-strstreambuf::underflow()
-{
-    if (gptr() == egptr())
-    {
-        if (egptr() >= pptr())
-            return EOF;
-        setg(eback(), gptr(), pptr());
+strstreambuf::int_type strstreambuf::pbackfail(int_type __c) {
+  if (eback() == gptr())
+    return EOF;
+  if (__c == EOF) {
+    gbump(-1);
+    return int_type(0);
+  }
+  if (__strmode_ & __constant) {
+    if (gptr()[-1] == static_cast<char>(__c)) {
+      gbump(-1);
+      return __c;
     }
-    return int_type(static_cast<unsigned char>(*gptr()));
+    return EOF;
+  }
+  gbump(-1);
+  *gptr() = static_cast<char>(__c);
+  return __c;
 }
 
-strstreambuf::pos_type
-strstreambuf::seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __which)
-{
-    off_type __p(-1);
-    bool pos_in = (__which & ios::in) != 0;
-    bool pos_out = (__which & ios::out) != 0;
-    bool legal = false;
-    switch (__way)
-    {
-    case ios::beg:
-    case ios::end:
-        if (pos_in || pos_out)
-            legal = true;
-        break;
-    case ios::cur:
-        if (pos_in != pos_out)
-            legal = true;
-        break;
-    }
-    if (pos_in && gptr() == nullptr)
-        legal = false;
-    if (pos_out && pptr() == nullptr)
-        legal = false;
-    if (legal)
-    {
-        off_type newoff;
-        char* seekhigh = epptr() ? epptr() : egptr();
-        switch (__way)
-        {
-        case ios::beg:
-            newoff = 0;
-            break;
-        case ios::cur:
-            newoff = (pos_in ? gptr() : pptr()) - eback();
-            break;
-        case ios::end:
-            newoff = seekhigh - eback();
-            break;
-        default:
-            __libcpp_unreachable();
-        }
-        newoff += __off;
-        if (0 <= newoff && newoff <= seekhigh - eback())
-        {
-            char* newpos = eback() + newoff;
-            if (pos_in)
-                setg(eback(), newpos, _VSTD::max(newpos, egptr()));
-            if (pos_out)
-            {
-                // min(pbase, newpos), newpos, epptr()
-                __off = epptr() - newpos;
-                setp(min(pbase(), newpos), epptr());
-                __pbump((epptr() - pbase()) - __off);
-            }
-            __p = newoff;
-        }
-    }
-    return pos_type(__p);
+strstreambuf::int_type strstreambuf::underflow() {
+  if (gptr() == egptr()) {
+    if (egptr() >= pptr())
+      return EOF;
+    setg(eback(), gptr(), pptr());
+  }
+  return int_type(static_cast<unsigned char>(*gptr()));
 }
 
-strstreambuf::pos_type
-strstreambuf::seekpos(pos_type __sp, ios_base::openmode __which)
-{
-    off_type __p(-1);
-    bool pos_in = (__which & ios::in) != 0;
-    bool pos_out = (__which & ios::out) != 0;
-    if (pos_in || pos_out)
-    {
-        if (!((pos_in && gptr() == nullptr) || (pos_out && pptr() == nullptr)))
-        {
-            off_type newoff = __sp;
-            char* seekhigh = epptr() ? epptr() : egptr();
-            if (0 <= newoff && newoff <= seekhigh - eback())
-            {
-                char* newpos = eback() + newoff;
-                if (pos_in)
-                    setg(eback(), newpos, _VSTD::max(newpos, egptr()));
-                if (pos_out)
-                {
-                    // min(pbase, newpos), newpos, epptr()
-                    off_type temp = epptr() - newpos;
-                    setp(min(pbase(), newpos), epptr());
-                    __pbump((epptr() - pbase()) - temp);
-                }
-                __p = newoff;
-            }
-        }
-    }
-    return pos_type(__p);
-}
+strstreambuf::pos_type strstreambuf::seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __which) {
+  bool pos_in  = (__which & ios::in) != 0;
+  bool pos_out = (__which & ios::out) != 0;
+  switch (__way) {
+  case ios::beg:
+  case ios::end:
+    if (!pos_in && !pos_out)
+      return pos_type(off_type(-1));
+    break;
+  case ios::cur:
+    if (pos_in == pos_out)
+      return pos_type(off_type(-1));
+    break;
+  }
 
-istrstream::~istrstream()
-{
-}
+  if (pos_in && gptr() == nullptr)
+    return pos_type(off_type(-1));
+  if (pos_out && pptr() == nullptr)
+    return pos_type(off_type(-1));
+
+  off_type newoff;
+  char* seekhigh = epptr() ? epptr() : egptr();
+  switch (__way) {
+  case ios::beg:
+    newoff = 0;
+    break;
+  case ios::cur:
+    newoff = (pos_in ? gptr() : pptr()) - eback();
+    break;
+  case ios::end:
+    newoff = seekhigh - eback();
+    break;
+  default:
+    __libcpp_unreachable();
+  }
+  newoff += __off;
+  if (newoff < 0 || newoff > seekhigh - eback())
+    return pos_type(off_type(-1));
 
-ostrstream::~ostrstream()
-{
+  char* newpos = eback() + newoff;
+  if (pos_in)
+    setg(eback(), newpos, _VSTD::max(newpos, egptr()));
+  if (pos_out) {
+    // min(pbase, newpos), newpos, epptr()
+    __off = epptr() - newpos;
+    setp(min(pbase(), newpos), epptr());
+    __pbump((epptr() - pbase()) - __off);
+  }
+  return pos_type(newoff);
 }
 
-strstream::~strstream()
-{
+strstreambuf::pos_type strstreambuf::seekpos(pos_type __sp, ios_base::openmode __which) {
+  bool pos_in  = (__which & ios::in) != 0;
+  bool pos_out = (__which & ios::out) != 0;
+  if (!pos_in && !pos_out)
+    return pos_type(off_type(-1));
+
+  if ((pos_in && gptr() == nullptr) || (pos_out && pptr() == nullptr))
+    return pos_type(off_type(-1));
+
+  off_type newoff = __sp;
+  char* seekhigh  = epptr() ? epptr() : egptr();
+  if (newoff < 0 || newoff > seekhigh - eback())
+    return pos_type(off_type(-1));
+
+  char* newpos = eback() + newoff;
+  if (pos_in)
+    setg(eback(), newpos, _VSTD::max(newpos, egptr()));
+  if (pos_out) {
+    // min(pbase, newpos), newpos, epptr()
+    off_type temp = epptr() - newpos;
+    setp(min(pbase(), newpos), epptr());
+    __pbump((epptr() - pbase()) - temp);
+  }
+  return pos_type(newoff);
 }
 
+istrstream::~istrstream() {}
+
+ostrstream::~ostrstream() {}
+
+strstream::~strstream() {}
+
 _LIBCPP_END_NAMESPACE_STD
 
 _LIBCPP_POP_MACROS
diff --git a/contrib/libs/cxxsupp/libcxx/src/support/win32/locale_win32.cpp b/contrib/libs/cxxsupp/libcxx/src/support/win32/locale_win32.cpp
index 2543686c90..c9d1d63b25 100644
--- a/contrib/libs/cxxsupp/libcxx/src/support/win32/locale_win32.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/support/win32/locale_win32.cpp
@@ -17,8 +17,8 @@ int __libcpp_vasprintf(char **sptr, const char *__restrict fmt, va_list ap);
 
 using std::__libcpp_locale_guard;
 
-// FIXME: base currently unused. Needs manual work to construct the new locale
-locale_t newlocale( int mask, const char * locale, locale_t /*base*/ )
+// FIXME: base and mask currently unused. Needs manual work to construct the new locale
+locale_t newlocale(int /*mask*/, const char * locale, locale_t /*base*/)
 {
     return {_create_locale( LC_ALL, locale ), locale};
 }
diff --git a/contrib/libs/cxxsupp/libcxx/src/support/win32/thread_win32.cpp b/contrib/libs/cxxsupp/libcxx/src/support/win32/thread_win32.cpp
index f2072b1435..c25aefcc34 100644
--- a/contrib/libs/cxxsupp/libcxx/src/support/win32/thread_win32.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/support/win32/thread_win32.cpp
@@ -7,6 +7,8 @@
 //===----------------------------------------------------------------------===//
 
 #include <__threading_support>
+#include <chrono>
+
 #define NOMINMAX
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
diff --git a/contrib/libs/cxxsupp/libcxx/src/system_error.cpp b/contrib/libs/cxxsupp/libcxx/src/system_error.cpp
index 7875f59d88..1cc6b7d7e1 100644
--- a/contrib/libs/cxxsupp/libcxx/src/system_error.cpp
+++ b/contrib/libs/cxxsupp/libcxx/src/system_error.cpp
@@ -6,12 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include <__config>
-#ifdef _LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS
-#   define _LIBCPP_ERROR_CATEGORY_DEFINE_LEGACY_INLINE_FUNCTIONS
-#endif
-
 #include <__assert>
+#include <__config>
 #include <__verbose_abort>
 #include <cerrno>
 #include <cstdio>
@@ -29,38 +25,8 @@
 
 _LIBCPP_BEGIN_NAMESPACE_STD
 
-// class error_category
-
-#if defined(_LIBCPP_ERROR_CATEGORY_DEFINE_LEGACY_INLINE_FUNCTIONS)
-error_category::error_category() noexcept
-{
-}
-#endif
-
-error_category::~error_category() noexcept
-{
-}
-
-error_condition
-error_category::default_error_condition(int ev) const noexcept
-{
-    return error_condition(ev, *this);
-}
-
-bool
-error_category::equivalent(int code, const error_condition& condition) const noexcept
-{
-    return default_error_condition(code) == condition;
-}
-
-bool
-error_category::equivalent(const error_code& code, int condition) const noexcept
-{
-    return *this == code.category() && code.value() == condition;
-}
-
-#if !defined(_LIBCPP_HAS_NO_THREADS)
 namespace {
+#if !defined(_LIBCPP_HAS_NO_THREADS)
 
 //  GLIBC also uses 1024 as the maximum buffer size internally.
 constexpr size_t strerror_buff_size = 1024;
@@ -128,8 +94,26 @@ string do_strerror_r(int ev) {
     return string(error_message);
 }
 #endif
+
+#endif // !defined(_LIBCPP_HAS_NO_THREADS)
+
+string make_error_str(const error_code& ec, string what_arg) {
+    if (ec) {
+        if (!what_arg.empty()) {
+            what_arg += ": ";
+        }
+        what_arg += ec.message();
+    }
+    return what_arg;
+}
+
+string make_error_str(const error_code& ec) {
+    if (ec) {
+        return ec.message();
+    }
+    return string();
+}
 } // end namespace
-#endif
 
 string
 __do_message::message(int ev) const
@@ -168,8 +152,13 @@ __generic_error_category::message(int ev) const
 const error_category&
 generic_category() noexcept
 {
-    static __generic_error_category s;
-    return s;
+    union AvoidDestroyingGenericCategory {
+        __generic_error_category generic_error_category;
+        constexpr explicit AvoidDestroyingGenericCategory() : generic_error_category() {}
+        ~AvoidDestroyingGenericCategory() {}
+    };
+    constinit static AvoidDestroyingGenericCategory helper;
+    return helper.generic_error_category;
 }
 
 class _LIBCPP_HIDDEN __system_error_category
@@ -210,8 +199,13 @@ __system_error_category::default_error_condition(int ev) const noexcept
 const error_category&
 system_category() noexcept
 {
-    static __system_error_category s;
-    return s;
+    union AvoidDestroyingSystemCategory {
+        __system_error_category system_error_category;
+        constexpr explicit AvoidDestroyingSystemCategory() : system_error_category() {}
+        ~AvoidDestroyingSystemCategory() {}
+    };
+    constinit static AvoidDestroyingSystemCategory helper;
+    return helper.system_error_category;
 }
 
 // error_condition
@@ -232,50 +226,38 @@ error_code::message() const
 
 // system_error
 
-string
-system_error::__init(const error_code& ec, string what_arg)
-{
-    if (ec)
-    {
-        if (!what_arg.empty())
-            what_arg += ": ";
-        what_arg += ec.message();
-    }
-    return what_arg;
-}
-
 system_error::system_error(error_code ec, const string& what_arg)
-    : runtime_error(__init(ec, what_arg)),
+    : runtime_error(make_error_str(ec, what_arg)),
       __ec_(ec)
 {
 }
 
 system_error::system_error(error_code ec, const char* what_arg)
-    : runtime_error(__init(ec, what_arg)),
+    : runtime_error(make_error_str(ec, what_arg)),
       __ec_(ec)
 {
 }
 
 system_error::system_error(error_code ec)
-    : runtime_error(__init(ec, "")),
+    : runtime_error(make_error_str(ec)),
       __ec_(ec)
 {
 }
 
 system_error::system_error(int ev, const error_category& ecat, const string& what_arg)
-    : runtime_error(__init(error_code(ev, ecat), what_arg)),
+    : runtime_error(make_error_str(error_code(ev, ecat), what_arg)),
       __ec_(error_code(ev, ecat))
 {
 }
 
 system_error::system_error(int ev, const error_category& ecat, const char* what_arg)
-    : runtime_error(__init(error_code(ev, ecat), what_arg)),
+    : runtime_error(make_error_str(error_code(ev, ecat), what_arg)),
       __ec_(error_code(ev, ecat))
 {
 }
 
 system_error::system_error(int ev, const error_category& ecat)
-    : runtime_error(__init(error_code(ev, ecat), "")),
+    : runtime_error(make_error_str(error_code(ev, ecat))),
       __ec_(error_code(ev, ecat))
 {
 }
@@ -288,8 +270,9 @@ void
 __throw_system_error(int ev, const char* what_arg)
 {
 #ifndef _LIBCPP_HAS_NO_EXCEPTIONS
-    throw system_error(error_code(ev, system_category()), what_arg);
+    std::__throw_system_error(error_code(ev, system_category()), what_arg);
 #else
+    // The above could also handle the no-exception case, but for size, avoid referencing system_category() unnecessarily.
     _LIBCPP_VERBOSE_ABORT("system_error was thrown in -fno-exceptions mode with error %i and message \"%s\"", ev, what_arg);
 #endif
 }
diff --git a/contrib/libs/cxxsupp/libcxx/src/tz.cpp b/contrib/libs/cxxsupp/libcxx/src/tz.cpp
new file mode 100644
index 0000000000..4425f0e6b9
--- /dev/null
+++ b/contrib/libs/cxxsupp/libcxx/src/tz.cpp
@@ -0,0 +1,146 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// For information see https://libcxx.llvm.org/DesignDocs/TimeZone.html
+
+#include <chrono>
+#include <filesystem>
+#include <fstream>
+#include <stdexcept>
+#include <string>
+
+// Contains a parser for the IANA time zone data files.
+//
+// These files can be found at https://data.iana.org/time-zones/ and are in the
+// public domain. Information regarding the input can be found at
+// https://data.iana.org/time-zones/tz-how-to.html and
+// https://man7.org/linux/man-pages/man8/zic.8.html.
+//
+// As indicated at https://howardhinnant.github.io/date/tz.html#Installation
+// For Windows another file seems to be required
+// https://raw.githubusercontent.com/unicode-org/cldr/master/common/supplemental/windowsZones.xml
+// This file seems to contain the mapping of Windows time zone name to IANA
+// time zone names.
+//
+// However this article mentions another way to do the mapping on Windows
+// https://devblogs.microsoft.com/oldnewthing/20210527-00/?p=105255
+// This requires Windows 10 Version 1903, which was released in May of 2019
+// and considered end of life in December 2020
+// https://learn.microsoft.com/en-us/lifecycle/announcements/windows-10-1903-end-of-servicing
+//
+// TODO TZDB Implement the Windows mapping in tzdb::current_zone
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace chrono {
+
+// This function is weak so it can be overriden in the tests. The
+// declaration is in the test header test/support/test_tzdb.h
+_LIBCPP_WEAK string_view __libcpp_tzdb_directory() {
+#if defined(__linux__)
+  return "/usr/share/zoneinfo/";
+#else
+#  error "unknown path to the IANA Time Zone Database"
+#endif
+}
+
+[[nodiscard]] static bool __is_whitespace(int __c) { return __c == ' ' || __c == '\t'; }
+
+static void __skip_optional_whitespace(istream& __input) {
+  while (chrono::__is_whitespace(__input.peek()))
+    __input.get();
+}
+
+static void __skip_mandatory_whitespace(istream& __input) {
+  if (!chrono::__is_whitespace(__input.get()))
+    std::__throw_runtime_error("corrupt tzdb: expected whitespace");
+
+  chrono::__skip_optional_whitespace(__input);
+}
+
+static void __matches(istream& __input, char __expected) {
+  if (std::tolower(__input.get()) != __expected)
+    std::__throw_runtime_error((string("corrupt tzdb: expected character '") + __expected + '\'').c_str());
+}
+
+static void __matches(istream& __input, string_view __expected) {
+  for (auto __c : __expected)
+    if (std::tolower(__input.get()) != __c)
+      std::__throw_runtime_error((string("corrupt tzdb: expected string '") + string(__expected) + '\'').c_str());
+}
+
+[[nodiscard]] static string __parse_string(istream& __input) {
+  string __result;
+  while (true) {
+    int __c = __input.get();
+    switch (__c) {
+    case ' ':
+    case '\t':
+    case '\n':
+      __input.unget();
+      [[fallthrough]];
+    case istream::traits_type::eof():
+      if (__result.empty())
+        std::__throw_runtime_error("corrupt tzdb: expected a string");
+
+      return __result;
+
+    default:
+      __result.push_back(__c);
+    }
+  }
+}
+
+static string __parse_version(istream& __input) {
+  // The first line in tzdata.zi contains
+  //    # version YYYYw
+  // The parser expects this pattern
+  // #\s*version\s*\(.*)
+  // This part is not documented.
+  chrono::__matches(__input, '#');
+  chrono::__skip_optional_whitespace(__input);
+  chrono::__matches(__input, "version");
+  chrono::__skip_mandatory_whitespace(__input);
+  return chrono::__parse_string(__input);
+}
+
+static tzdb __make_tzdb() {
+  tzdb __result;
+
+  filesystem::path __root = chrono::__libcpp_tzdb_directory();
+  ifstream __tzdata{__root / "tzdata.zi"};
+
+  __result.version = chrono::__parse_version(__tzdata);
+  return __result;
+}
+
+//===----------------------------------------------------------------------===//
+//                           Public API
+//===----------------------------------------------------------------------===//
+
+_LIBCPP_NODISCARD_EXT _LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI tzdb_list& get_tzdb_list() {
+  static tzdb_list __result{chrono::__make_tzdb()};
+  return __result;
+}
+
+_LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI const tzdb& reload_tzdb() {
+  if (chrono::remote_version() == chrono::get_tzdb().version)
+    return chrono::get_tzdb();
+
+  return chrono::get_tzdb_list().__emplace_front(chrono::__make_tzdb());
+}
+
+_LIBCPP_NODISCARD_EXT _LIBCPP_AVAILABILITY_TZDB _LIBCPP_EXPORTED_FROM_ABI string remote_version() {
+  filesystem::path __root = chrono::__libcpp_tzdb_directory();
+  ifstream __tzdata{__root / "tzdata.zi"};
+  return chrono::__parse_version(__tzdata);
+}
+
+} // namespace chrono
+
+_LIBCPP_END_NAMESPACE_STD
diff --git a/contrib/libs/cxxsupp/libcxx/src/tzdb_list.cpp b/contrib/libs/cxxsupp/libcxx/src/tzdb_list.cpp
new file mode 100644
index 0000000000..7eaaedc6ed
--- /dev/null
+++ b/contrib/libs/cxxsupp/libcxx/src/tzdb_list.cpp
@@ -0,0 +1,113 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// For information see https://libcxx.llvm.org/DesignDocs/TimeZone.html
+
+#include <chrono>
+
+#include <__mutex/unique_lock.h>
+#include <forward_list>
+
+// When threads are not available the locking is not required.
+#ifndef _LIBCPP_HAS_NO_THREADS
+#  include <shared_mutex>
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace chrono {
+
+//===----------------------------------------------------------------------===//
+//                          Private API
+//===----------------------------------------------------------------------===//
+
+class tzdb_list::__impl {
+public:
+  explicit __impl(tzdb&& __tzdb) { __tzdb_.push_front(std::move(__tzdb)); }
+
+  using const_iterator = tzdb_list::const_iterator;
+
+  const tzdb& front() const noexcept {
+#ifndef _LIBCPP_HAS_NO_THREADS
+    shared_lock __lock{__mutex_};
+#endif
+    return __tzdb_.front();
+  }
+
+  const_iterator erase_after(const_iterator __p) {
+#ifndef _LIBCPP_HAS_NO_THREADS
+    unique_lock __lock{__mutex_};
+#endif
+    return __tzdb_.erase_after(__p);
+  }
+
+  tzdb& __emplace_front(tzdb&& __tzdb) {
+#ifndef _LIBCPP_HAS_NO_THREADS
+    unique_lock __lock{__mutex_};
+#endif
+    return __tzdb_.emplace_front(std::move(__tzdb));
+  }
+
+  const_iterator begin() const noexcept {
+#ifndef _LIBCPP_HAS_NO_THREADS
+    shared_lock __lock{__mutex_};
+#endif
+    return __tzdb_.begin();
+  }
+  const_iterator end() const noexcept {
+    //  forward_list<T>::end does not access the list, so no need to take a lock.
+    return __tzdb_.end();
+  }
+
+  const_iterator cbegin() const noexcept { return begin(); }
+  const_iterator cend() const noexcept { return end(); }
+
+private:
+#ifndef _LIBCPP_HAS_NO_THREADS
+  mutable shared_mutex __mutex_;
+#endif
+  forward_list<tzdb> __tzdb_;
+};
+
+//===----------------------------------------------------------------------===//
+//                           Public API
+//===----------------------------------------------------------------------===//
+
+_LIBCPP_EXPORTED_FROM_ABI tzdb_list::tzdb_list(tzdb&& __tzdb) : __impl_{new __impl(std::move(__tzdb))} {}
+
+_LIBCPP_EXPORTED_FROM_ABI tzdb_list::~tzdb_list() { delete __impl_; }
+
+_LIBCPP_NODISCARD_EXT _LIBCPP_EXPORTED_FROM_ABI const tzdb& tzdb_list::front() const noexcept {
+  return __impl_->front();
+}
+
+_LIBCPP_EXPORTED_FROM_ABI tzdb_list::const_iterator tzdb_list::erase_after(const_iterator __p) {
+  return __impl_->erase_after(__p);
+}
+
+_LIBCPP_EXPORTED_FROM_ABI tzdb& tzdb_list::__emplace_front(tzdb&& __tzdb) {
+  return __impl_->__emplace_front(std::move(__tzdb));
+}
+
+_LIBCPP_NODISCARD_EXT _LIBCPP_EXPORTED_FROM_ABI tzdb_list::const_iterator tzdb_list::begin() const noexcept {
+  return __impl_->begin();
+}
+_LIBCPP_NODISCARD_EXT _LIBCPP_EXPORTED_FROM_ABI tzdb_list::const_iterator tzdb_list::end() const noexcept {
+  return __impl_->end();
+}
+
+_LIBCPP_NODISCARD_EXT _LIBCPP_EXPORTED_FROM_ABI tzdb_list::const_iterator tzdb_list::cbegin() const noexcept {
+  return __impl_->cbegin();
+}
+_LIBCPP_NODISCARD_EXT _LIBCPP_EXPORTED_FROM_ABI tzdb_list::const_iterator tzdb_list::cend() const noexcept {
+  return __impl_->cend();
+}
+
+} // namespace chrono
+
+_LIBCPP_END_NAMESPACE_STD