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| author | Jonathan Wakely <jwakely@redhat.com> | 2024-10-22 16:26:27 +0100 |
|---|---|---|
| committer | Jonathan Wakely <redi@gcc.gnu.org> | 2024-10-23 19:45:10 +0100 |
| commit | 5467f5b5ca6f2302573649b4a4f897793a9a6e7f (patch) | |
| tree | 019cdb8e1d1d0d39cebf18e0a31bed8b517db118 /gcc | |
| parent | f342d66d6990b9559dde13e616a2921a7bfae176 (diff) | |
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ginclude: stdalign.h should define __xxx_is_defined macros for C++
The __alignas_is_defined macro has been required by C++ since C++11, and
C++ Library DR 4036 clarified that __alignof_is_defined should be
defined too. The whole <stdalign.h> header was deprecated for C++23 (see
LWG 3827) and is likely to be removed for C++26 (see P3348), but we can
deal with that later.
The macros alignas and alignof should not be defined, as they're
keywords in C++.
gcc/ChangeLog:
* ginclude/stdalign.h (__alignas_is_defined): Define for C++.
(__alignof_is_defined): Likewise.
libstdc++-v3/ChangeLog:
* testsuite/18_support/headers/cstdalign/macros.cc: New test.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ginclude/stdalign.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/gcc/ginclude/stdalign.h b/gcc/ginclude/stdalign.h index 5f82f2d..980b1bb 100644 --- a/gcc/ginclude/stdalign.h +++ b/gcc/ginclude/stdalign.h @@ -26,12 +26,14 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see #ifndef _STDALIGN_H #define _STDALIGN_H -#if (!defined __cplusplus \ - && !(defined __STDC_VERSION__ && __STDC_VERSION__ > 201710L)) +#if !(defined __STDC_VERSION__ && __STDC_VERSION__ > 201710L) +#ifndef __cplusplus #define alignas _Alignas #define alignof _Alignof +#endif +/* These are defined for C++, but deprecated in C++23. */ #define __alignas_is_defined 1 #define __alignof_is_defined 1 |