diff options
Diffstat (limited to 'gnulib/import/stddef.in.h')
| -rw-r--r-- | gnulib/import/stddef.in.h | 35 |
1 files changed, 23 insertions, 12 deletions
diff --git a/gnulib/import/stddef.in.h b/gnulib/import/stddef.in.h index f4c4a10..6760561 100644 --- a/gnulib/import/stddef.in.h +++ b/gnulib/import/stddef.in.h @@ -1,6 +1,6 @@ /* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues. - Copyright (C) 2009-2016 Free Software Foundation, Inc. + Copyright (C) 2009-2019 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -13,13 +13,13 @@ GNU General Public License for more details. You should have received a copy of the GNU General Public License - along with this program; if not, see <http://www.gnu.org/licenses/>. */ + along with this program; if not, see <https://www.gnu.org/licenses/>. */ /* Written by Eric Blake. */ /* * POSIX 2008 <stddef.h> for platforms that have issues. - * <http://www.opengroup.org/susv3xbd/stddef.h.html> + * <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stddef.h.html> */ #if __GNUC__ >= 3 @@ -83,26 +83,37 @@ /* Some platforms lack max_align_t. The check for _GCC_MAX_ALIGN_T is a hack in case the configure-time test was done with g++ even though - we are currently compiling with gcc. */ -#if ! (@HAVE_MAX_ALIGN_T@ || defined _GCC_MAX_ALIGN_T) + we are currently compiling with gcc. + On MSVC, max_align_t is defined only in C++ mode, after <cstddef> was + included. Its definition is good since it has an alignment of 8 (on x86 + and x86_64). */ +#if defined _MSC_VER && defined __cplusplus +# include <cstddef> +#else +# if ! (@HAVE_MAX_ALIGN_T@ || defined _GCC_MAX_ALIGN_T) +# if !GNULIB_defined_max_align_t /* On the x86, the maximum storage alignment of double, long, etc. is 4, but GCC's C11 ABI for x86 says that max_align_t has an alignment of 8, and the C11 standard allows this. Work around this problem by using __alignof__ (which returns 8 for double) rather than _Alignof (which returns 4), and align each union member accordingly. */ -# ifdef __GNUC__ -# define _GL_STDDEF_ALIGNAS(type) \ - __attribute__ ((__aligned__ (__alignof__ (type)))) -# else -# define _GL_STDDEF_ALIGNAS(type) /* */ -# endif +# ifdef __GNUC__ +# define _GL_STDDEF_ALIGNAS(type) \ + __attribute__ ((__aligned__ (__alignof__ (type)))) +# else +# define _GL_STDDEF_ALIGNAS(type) /* */ +# endif typedef union { char *__p _GL_STDDEF_ALIGNAS (char *); double __d _GL_STDDEF_ALIGNAS (double); long double __ld _GL_STDDEF_ALIGNAS (long double); long int __i _GL_STDDEF_ALIGNAS (long int); -} max_align_t; +} rpl_max_align_t; +# define max_align_t rpl_max_align_t +# define GNULIB_defined_max_align_t 1 +# endif +# endif #endif # endif /* _@GUARD_PREFIX@_STDDEF_H */ |