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Merge from gnulib

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* lib/stddef.in.h: Update from gnulib, incorporating:
2015-04-02 stddef: port to pre-C11 GCC on x86
This commit is contained in:
Paul Eggert 2015-04-06 21:47:08 -07:00
parent 4d748735d5
commit 9d56a21e6a
2 changed files with 21 additions and 4 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2015-04-07 Paul Eggert <eggert@cs.ucla.edu>
Merge from gnulib
* lib/stddef.in.h: Update from gnulib, incorporating:
2015-04-02 stddef: port to pre-C11 GCC on x86
2015-04-03 Paul Eggert <eggert@cs.ucla.edu>
Port 'configure' to clang 3.5

19
lib/stddef.in.h
View file

@ -83,12 +83,23 @@
/* Some platforms lack max_align_t. */
#if !@HAVE_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
typedef union
{
char *__p;
double __d;
long double __ld;
long int __i;
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;
#endif