1 files changed, 52 insertions, 0 deletions
diff --git a/contrib/llvm-project/libcxx/include/__chrono/statically_widen.h b/contrib/llvm-project/libcxx/include/__chrono/statically_widen.h
new file mode 100644
index 000000000000..a18c46f057a8
--- /dev/null
+++ b/contrib/llvm-project/libcxx/include/__chrono/statically_widen.h
@@ -0,0 +1,52 @@
+// -*- 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_STATICALLY_WIDEN_H
+#define _LIBCPP___CHRONO_STATICALLY_WIDEN_H
+
+// Implements the STATICALLY-WIDEN exposition-only function. ([time.general]/2)
+
+#include <__concepts/same_as.h>
+#include <__config>
+#include <__format/concepts.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if _LIBCPP_STD_VER >= 20
+
+#  ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
+template <__fmt_char_type _CharT>
+_LIBCPP_HIDE_FROM_ABI constexpr const _CharT* __statically_widen(const char* __str, const wchar_t* __wstr) {
+  if constexpr (same_as<_CharT, char>)
+    return __str;
+  else
+    return __wstr;
+}
+#    define _LIBCPP_STATICALLY_WIDEN(_CharT, __str) ::std::__statically_widen<_CharT>(__str, L##__str)
+#  else // _LIBCPP_HAS_NO_WIDE_CHARACTERS
+
+// Without this indirection the unit test test/libcxx/modules_include.sh.cpp
+// fails for the CI build "No wide characters". This seems like a bug.
+// TODO FMT investigate why this is needed.
+template <__fmt_char_type _CharT>
+_LIBCPP_HIDE_FROM_ABI constexpr const _CharT* __statically_widen(const char* __str) {
+  return __str;
+}
+#    define _LIBCPP_STATICALLY_WIDEN(_CharT, __str) ::std::__statically_widen<_CharT>(__str)
+#  endif // _LIBCPP_HAS_NO_WIDE_CHARACTERS
+
+#endif //_LIBCPP_STD_VER >= 20
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___CHRONO_STATICALLY_WIDEN_H