# Check for stdalign.h that conforms to C11.

dnl Copyright 2011-2017 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>

            #include <stddef.h>

            /* Test that alignof yields a result consistent with offsetof.

               This catches GCC bug 52023

               <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023>.  */

            #ifdef __cplusplus

               template <class t> struct alignof_helper { char a; t b; };

            # define ao(type) offsetof (alignof_helper<type>, b)

            #else

            # define ao(type) offsetof (struct { char a; type b; }, b)

            #endif

            char test_double[ao (double) % _Alignof (double) == 0 ? 1 : -1];

            char test_long[ao (long int) % _Alignof (long int) == 0 ? 1 : -1];

            char test_alignof[alignof (double) == _Alignof (double) ? 1 : -1];

            /* Test _Alignas only on platforms where gnulib can help.  */

            #if \

                ((defined __cplusplus && 201103 <= __cplusplus) \

                 || (defined __APPLE__ && defined __MACH__ \

                     ? 4 < __GNUC__ + (1 <= __GNUC_MINOR__) \

                     : __GNUC__) \

                 || (__ia64 && (61200 <= __HP_cc || 61200 <= __HP_aCC)) \

                 || __ICC || 0x590 <= __SUNPRO_C || 0x0600 <= __xlC__ \

                 || 1300 <= _MSC_VER)

              struct alignas_test { char c; char alignas (8) alignas_8; };

              char test_alignas[offsetof (struct alignas_test, alignas_8) == 8

                                ? 1 : -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"])

])