stddef_h.m4
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stddef_h.m4
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	dnl A placeholder for POSIX 2008 <stddef.h>, for platforms that have issues.
	# stddef_h.m4 serial 3
	dnl Copyright (C) 2009-2011 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.

	AC_DEFUN([gl_STDDEF_H],
	[
	AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
	AC_REQUIRE([gt_TYPE_WCHAR_T])
	if test $gt_cv_c_wchar_t = no; then
	HAVE_WCHAR_T=0
	STDDEF_H=stddef.h
	fi
	AC_CACHE_CHECK([whether NULL can be used in arbitrary expressions],
	[gl_cv_decl_null_works],
	[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stddef.h>
	int test[2 * (sizeof NULL == sizeof (void *)) -1];
	]])],
	[gl_cv_decl_null_works=yes],
	[gl_cv_decl_null_works=no])])
	if test $gl_cv_decl_null_works = no; then
	REPLACE_NULL=1
	STDDEF_H=stddef.h
	fi
	if test -n "$STDDEF_H"; then
	gl_NEXT_HEADERS([stddef.h])
	fi
	])

	AC_DEFUN([gl_STDDEF_MODULE_INDICATOR],
	[
	dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
	AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
	gl_MODULE_INDICATOR_SET_VARIABLE([$1])
	])

	AC_DEFUN([gl_STDDEF_H_DEFAULTS],
	[
	dnl Assume proper GNU behavior unless another module says otherwise.
	REPLACE_NULL=0; AC_SUBST([REPLACE_NULL])
	HAVE_WCHAR_T=1; AC_SUBST([HAVE_WCHAR_T])
	STDDEF_H=''; AC_SUBST([STDDEF_H])
	])