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# Check for stdalign.h that conforms to C1x.
dnl Copyright 2011 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.
# Prepare for substituting <stdalign.h> if it is not supported.
AC_DEFUN([gl_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);
/* 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 $gl_cv_header_working_stdalign_h = yes; then
STDALIGN_H=''
else
STDALIGN_H='stdalign.h'
fi
AC_SUBST([STDALIGN_H])
AM_CONDITIONAL([GL_GENERATE_STDALIGN_H], [test -n "$STDALIGN_H"])
])
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