[gcc r13-4613] libstdc++: Change names that clash with Win32 or Clang

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:cb363fd9f19eb791e1ee1eb0d5c61f5fdf21af32

commit r13-4613-gcb363fd9f19eb791e1ee1eb0d5c61f5fdf21af32
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Mon Dec 12 11:22:45 2022 +0000

    libstdc++: Change names that clash with Win32 or Clang
    
    Clang now defines an __is_unsigned built-in, and Windows defines an
    _Out_ macro. Replace uses of those as identifiers.
    
    There might also be a problem with __is_signed, which we use in several
    places.
    
    libstdc++-v3/ChangeLog:
    
            * include/std/chrono (hh_mm_ss): Rename __is_unsigned member to
            _S_is_unsigned.
            * include/std/format (basic_format_context): Rename _Out_
            template parameter to _Out2.
            * testsuite/17_intro/names.cc: Add Windows SAL annotation
            macros.

Diff:
---
 libstdc++-v3/include/std/chrono          |  6 +++---
 libstdc++-v3/include/std/format          |  8 ++++----
 libstdc++-v3/testsuite/17_intro/names.cc | 11 +++++++++++
 3 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/libstdc++-v3/include/std/chrono b/libstdc++-v3/include/std/chrono
index 38ecd3142bc..4c5fbfaeb83 100644
--- a/libstdc++-v3/include/std/chrono
+++ b/libstdc++-v3/include/std/chrono
@@ -2344,7 +2344,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	constexpr bool
 	is_negative() const noexcept
 	{
-	  if constexpr (!__is_unsigned)
+	  if constexpr (!_S_is_unsigned)
 	    return _M_is_neg;
 	  else
 	    return false;
@@ -2373,7 +2373,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	constexpr precision
 	to_duration() const noexcept
 	{
-	  if constexpr (!__is_unsigned)
+	  if constexpr (!_S_is_unsigned)
 	    if (_M_is_neg)
 	      return -(_M_h + _M_m + _M_s + subseconds());
 	  return _M_h + _M_m + _M_s + subseconds();
@@ -2382,7 +2382,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	// TODO: Implement operator<<.
 
       private:
-	static constexpr bool __is_unsigned
+	static constexpr bool _S_is_unsigned
 	  = __and_v<is_integral<typename _Duration::rep>,
 		    is_unsigned<typename _Duration::rep>>;
 
diff --git a/libstdc++-v3/include/std/format b/libstdc++-v3/include/std/format
index 1072e2c17db..269f8f6cc6a 100644
--- a/libstdc++-v3/include/std/format
+++ b/libstdc++-v3/include/std/format
@@ -3345,10 +3345,10 @@ namespace __format
       : _M_args(__args), _M_out(std::move(__out)), _M_loc(__loc)
       { }
 
-      template<typename _Out_, typename _CharT_, typename _Context_>
-	friend _Out_
-	__format::__do_vformat_to(_Out_, basic_string_view<_CharT_>,
-				  const basic_format_args<_Context_>&,
+      template<typename _Out2, typename _CharT2, typename _Context2>
+	friend _Out2
+	__format::__do_vformat_to(_Out2, basic_string_view<_CharT2>,
+				  const basic_format_args<_Context2>&,
 				  const locale*);
 
     public:
diff --git a/libstdc++-v3/testsuite/17_intro/names.cc b/libstdc++-v3/testsuite/17_intro/names.cc
index 963f74c11f3..16c104a438d 100644
--- a/libstdc++-v3/testsuite/17_intro/names.cc
+++ b/libstdc++-v3/testsuite/17_intro/names.cc
@@ -205,6 +205,17 @@
 #define ValueT			ValueT is not a reserved name
 #define ValueType		ValueType is not a reserved name
 
+#ifndef _WIN32
+// Windows SAL annotations
+#define _In_			cannot be used as an identifier
+#define _Inout_			cannot be used as an identifier
+#define _Out_			cannot be used as an identifier
+#define _Reserved_		cannot be used as an identifier
+#define __inout			cannot be used as an identifier
+#define __in_opt		cannot be used as an identifier
+#define __out_opt		cannot be used as an identifier
+#endif
+
 #ifdef _AIX
 // See https://gcc.gnu.org/ml/libstdc++/2017-03/msg00015.html
 #undef f