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# sys_cdefs_h.m4 - Is <sys/cdefs.h> compatible enough with glibc?
# serial 2
dnl Copyright 2024 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.
dnl Written by Paul Eggert.
AC_DEFUN_ONCE([gl_CHECK_HEADER_SYS_CDEFS_H],
[AC_CACHE_CHECK([for glibc-compatible sys/cdefs.h],
[gl_cv_header_sys_cdefs_h],
[AC_COMPILE_IFELSE(
[AC_LANG_DEFINES_PROVIDED
[#include <sys/cdefs.h>
enum { foo = __GNUC_PREREQ (14, 1) } bar;
]],
[gl_cv_header_sys_cdefs_h=yes],
[gl_cv_header_sys_cdefs_h=no])])
if test "$gl_cv_header_sys_cdefs_h" = yes; then
HAVE_SYS_CDEFS_H=1
else
HAVE_SYS_CDEFS_H=0
fi
AC_SUBST([HAVE_SYS_CDEFS_H])])
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