[PATCH 1/2] libstdc++: Normalise _GLIBCXX20_DEPRECATED macro

[Nathaniel Shead <nathanieloshead@gmail.com>]

These two patches implement P1413 (deprecate std::aligned_storage and
std::aligned_union) for C++23. Tested on x86_64-linux.

-- >8 --

Updates _GLIBCXX20_DEPRECATED to be defined and behave the same as the
versions for other standards (e.g. _GLIBCXX17_DEPRECATED).

libstdc++-v3/ChangeLog:

	* doc/doxygen/user.cfg.in (PREDEFINED): Update macros.
	* include/bits/c++config (_GLIBCXX20_DEPRECATED): Make
        consistent with other 'deprecated' macros.
	* include/std/type_traits (is_pod, is_pod_v): Use
        _GLIBCXX20_DEPRECATED_SUGGEST instead.

Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
---
 libstdc++-v3/doc/doxygen/user.cfg.in | 4 ++--
 libstdc++-v3/include/bits/c++config  | 6 +++---
 libstdc++-v3/include/std/type_traits | 4 ++--
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/libstdc++-v3/doc/doxygen/user.cfg.in b/libstdc++-v3/doc/doxygen/user.cfg.in
index 834ad9e4fd5..fc46e722529 100644
--- a/libstdc++-v3/doc/doxygen/user.cfg.in
+++ b/libstdc++-v3/doc/doxygen/user.cfg.in
@@ -2394,8 +2394,8 @@ PREDEFINED             = __cplusplus=202002L \
                          "_GLIBCXX11_DEPRECATED_SUGGEST(E)= " \
                          "_GLIBCXX17_DEPRECATED= " \
                          "_GLIBCXX17_DEPRECATED_SUGGEST(E)= " \
-                         "_GLIBCXX20_DEPRECATED(E)= " \
-                         "_GLIBCXX20_DEPRECATED(E)= " \
+                         "_GLIBCXX20_DEPRECATED= " \
+                         "_GLIBCXX20_DEPRECATED_SUGGEST(E)= " \
                          _GLIBCXX17_INLINE=inline \
                          _GLIBCXX_CHRONO_INT64_T=int64_t \
                          _GLIBCXX_DEFAULT_ABI_TAG \
diff --git a/libstdc++-v3/include/bits/c++config b/libstdc++-v3/include/bits/c++config
index 50406066afe..d2b0cfa15ce 100644
--- a/libstdc++-v3/include/bits/c++config
+++ b/libstdc++-v3/include/bits/c++config
@@ -84,7 +84,7 @@
 //   _GLIBCXX14_DEPRECATED_SUGGEST( string-literal )
 //   _GLIBCXX17_DEPRECATED
 //   _GLIBCXX17_DEPRECATED_SUGGEST( string-literal )
-//   _GLIBCXX20_DEPRECATED( string-literal )
+//   _GLIBCXX20_DEPRECATED
 //   _GLIBCXX20_DEPRECATED_SUGGEST( string-literal )
 #ifndef _GLIBCXX_USE_DEPRECATED
 # define _GLIBCXX_USE_DEPRECATED 1
@@ -124,10 +124,10 @@
 #endif
 
 #if defined(__DEPRECATED) && (__cplusplus >= 202002L)
-# define _GLIBCXX20_DEPRECATED(MSG) [[deprecated(MSG)]]
+# define _GLIBCXX20_DEPRECATED [[__deprecated__]]
 # define _GLIBCXX20_DEPRECATED_SUGGEST(ALT) _GLIBCXX_DEPRECATED_SUGGEST(ALT)
 #else
-# define _GLIBCXX20_DEPRECATED(MSG)
+# define _GLIBCXX20_DEPRECATED
 # define _GLIBCXX20_DEPRECATED_SUGGEST(ALT)
 #endif
 
diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits
index 5dc9e1b2921..2f4d4bb8d4d 100644
--- a/libstdc++-v3/include/std/type_traits
+++ b/libstdc++-v3/include/std/type_traits
@@ -815,7 +815,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   // Could use is_standard_layout && is_trivial instead of the builtin.
   template<typename _Tp>
     struct
-    _GLIBCXX20_DEPRECATED("use is_standard_layout && is_trivial instead")
+    _GLIBCXX20_DEPRECATED_SUGGEST("is_standard_layout && is_trivial")
     is_pod
     : public integral_constant<bool, __is_pod(_Tp)>
     {
@@ -3210,7 +3210,7 @@ template <typename _Tp>
 template <typename _Tp>
   inline constexpr bool is_standard_layout_v = __is_standard_layout(_Tp);
 template <typename _Tp>
-  _GLIBCXX20_DEPRECATED("use is_standard_layout_v && is_trivial_v instead")
+  _GLIBCXX20_DEPRECATED_SUGGEST("is_standard_layout_v && is_trivial_v")
   inline constexpr bool is_pod_v = __is_pod(_Tp);
 template <typename _Tp>
   _GLIBCXX17_DEPRECATED
-- 
2.34.1