1 # Check for stdalign.h that conforms to C11.
3 dnl Copyright 2011-2012 Free Software Foundation, Inc.
4 dnl This file is free software; the Free Software Foundation
5 dnl gives unlimited permission to copy and/or distribute it,
6 dnl with or without modifications, as long as this notice is preserved.
8 # Prepare for substituting <stdalign.h> if it is not supported.
10 AC_DEFUN([gl_STDALIGN_H],
12 AC_CACHE_CHECK([for working stdalign.h],
13 [gl_cv_header_working_stdalign_h],
16 [[#include <stdalign.h>
17 int align_int = alignof (int) + _Alignof (double);
19 /* Test _Alignas only on platforms where gnulib can help. */
21 (__GNUC__ || __IBMC__ || __IBMCPP__ \
22 || 0x5110 <= __SUNPRO_C || 1300 <= _MSC_VER)
23 int alignas (8) alignas_int = 1;
26 [gl_cv_header_working_stdalign_h=yes],
27 [gl_cv_header_working_stdalign_h=no])])
29 if test $gl_cv_header_working_stdalign_h = yes; then
32 STDALIGN_H='stdalign.h'
35 AC_SUBST([STDALIGN_H])
36 AM_CONDITIONAL([GL_GENERATE_STDALIGN_H], [test -n "$STDALIGN_H"])