diff options
Diffstat (limited to 'lib/stddef.in.h')
| -rw-r--r-- | lib/stddef.in.h | 33 |
1 files changed, 20 insertions, 13 deletions
diff --git a/lib/stddef.in.h b/lib/stddef.in.h index 8329a9b..2e50a1f 100644 --- a/lib/stddef.in.h +++ b/lib/stddef.in.h @@ -1,6 +1,6 @@ /* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues. - Copyright (C) 2009-2018 Free Software Foundation, Inc. + Copyright (C) 2009-2020 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 @@ -19,7 +19,7 @@ /* * 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 @@ -83,20 +83,26 @@ /* 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) -# if !GNULIB_defined_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 *); @@ -104,8 +110,9 @@ typedef union long double __ld _GL_STDDEF_ALIGNAS (long double); long int __i _GL_STDDEF_ALIGNAS (long int); } rpl_max_align_t; -# define max_align_t rpl_max_align_t -# define GNULIB_defined_max_align_t 1 +# define max_align_t rpl_max_align_t +# define GNULIB_defined_max_align_t 1 +# endif # endif #endif |