Update libc++ to 5726e559 (14 Jan 2022).

Notable changes:
* chrono modularization

ref:42040cfb4887a3eaac1dd7bc783623c820734637

1 files changed, 85 insertions, 0 deletions

diff --git a/contrib/libs/cxxsupp/libcxx/include/__chrono/file_clock.h b/contrib/libs/cxxsupp/libcxx/include/__chrono/file_clock.h
new file mode 100644
index 0000000000..cd8758f819
--- /dev/null
+++ b/contrib/libs/cxxsupp/libcxx/include/__chrono/file_clock.h
@@ -0,0 +1,85 @@
+// -*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___CHRONO_FILE_CLOCK_H
+#define _LIBCPP___CHRONO_FILE_CLOCK_H
+
+#include <__availability>
+#include <__chrono/duration.h>
+#include <__chrono/system_clock.h>
+#include <__chrono/time_point.h>
+#include <__config>
+#include <ratio>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+#ifndef _LIBCPP_CXX03_LANG
+_LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
+struct _FilesystemClock;
+_LIBCPP_END_NAMESPACE_FILESYSTEM
+#endif // !_LIBCPP_CXX03_LANG
+
+#if _LIBCPP_STD_VER > 17
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+namespace chrono
+{
+
+// [time.clock.file], type file_clock
+using file_clock = _VSTD_FS::_FilesystemClock;
+
+template<class _Duration>
+using file_time = time_point<file_clock, _Duration>;
+
+} // namespace chrono
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP_STD_VER > 17
+
+#ifndef _LIBCPP_CXX03_LANG
+_LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
+struct _FilesystemClock {
+#if !defined(_LIBCPP_HAS_NO_INT128)
+  typedef __int128_t rep;
+  typedef nano period;
+#else
+  typedef long long rep;
+  typedef nano period;
+#endif
+
+  typedef chrono::duration<rep, period> duration;
+  typedef chrono::time_point<_FilesystemClock> time_point;
+
+  _LIBCPP_EXPORTED_FROM_ABI
+  static _LIBCPP_CONSTEXPR_AFTER_CXX11 const bool is_steady = false;
+
+  _LIBCPP_AVAILABILITY_FILESYSTEM _LIBCPP_FUNC_VIS static time_point now() noexcept;
+
+#if _LIBCPP_STD_VER > 17
+  template <class _Duration>
+  _LIBCPP_HIDE_FROM_ABI
+  static chrono::sys_time<_Duration> to_sys(const chrono::file_time<_Duration>& __t) {
+    return chrono::sys_time<_Duration>(__t.time_since_epoch());
+  }
+
+  template <class _Duration>
+  _LIBCPP_HIDE_FROM_ABI
+  static chrono::file_time<_Duration> from_sys(const chrono::sys_time<_Duration>& __t) {
+    return chrono::file_time<_Duration>(__t.time_since_epoch());
+  }
+#endif // _LIBCPP_STD_VER > 17
+};
+_LIBCPP_END_NAMESPACE_FILESYSTEM
+#endif // !_LIBCPP_CXX03_LANG
+
+#endif // _LIBCPP___CHRONO_FILE_CLOCK_H