diff options
Diffstat (limited to 'gl/m4/stdalign.m4')
| -rw-r--r-- | gl/m4/stdalign.m4 | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/gl/m4/stdalign.m4 b/gl/m4/stdalign.m4 index da64dc6332..9752ba568b 100644 --- a/gl/m4/stdalign.m4 +++ b/gl/m4/stdalign.m4 @@ -1,6 +1,6 @@ -# Check for stdalign.h that conforms to C1x. +# Check for stdalign.h that conforms to C11. -dnl Copyright 2011 Free Software Foundation, Inc. +dnl Copyright 2011-2012 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. @@ -9,9 +9,24 @@ dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_STDALIGN_H], [ - AC_CHECK_HEADERS_ONCE([stdalign.h]) + AC_CACHE_CHECK([for working stdalign.h], + [gl_cv_header_working_stdalign_h], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#include <stdalign.h> + int align_int = alignof (int) + _Alignof (double); - if test $ac_cv_header_stdalign_h = yes; then + /* Test _Alignas only on platforms where gnulib can help. */ + #if \ + (__GNUC__ || __IBMC__ || __IBMCPP__ \ + || 0x5110 <= __SUNPRO_C || 1300 <= _MSC_VER) + int alignas (8) alignas_int = 1; + #endif + ]])], + [gl_cv_header_working_stdalign_h=yes], + [gl_cv_header_working_stdalign_h=no])]) + + if test $gl_cv_header_working_stdalign_h = yes; then STDALIGN_H='' else STDALIGN_H='stdalign.h' |