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source: kBuild/vendor/grep/2.12/m4/stddef_h.m4@ 2595

Last change on this file since 2595 was 2595, checked in by bird, 12 years ago

gnu grep version 2.12 (grep-2.12.tar.xz, md5sum=8d2f0346d08b13c18afb81f0e8aa1e2f)

File size: 1.5 KB
Line 
1dnl A placeholder for POSIX 2008 <stddef.h>, for platforms that have issues.
2# stddef_h.m4 serial 4
3dnl Copyright (C) 2009-2012 Free Software Foundation, Inc.
4dnl This file is free software; the Free Software Foundation
5dnl gives unlimited permission to copy and/or distribute it,
6dnl with or without modifications, as long as this notice is preserved.
7
8AC_DEFUN([gl_STDDEF_H],
9[
10 AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
11 AC_REQUIRE([gt_TYPE_WCHAR_T])
12 STDDEF_H=
13 if test $gt_cv_c_wchar_t = no; then
14 HAVE_WCHAR_T=0
15 STDDEF_H=stddef.h
16 fi
17 AC_CACHE_CHECK([whether NULL can be used in arbitrary expressions],
18 [gl_cv_decl_null_works],
19 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stddef.h>
20 int test[2 * (sizeof NULL == sizeof (void *)) -1];
21]])],
22 [gl_cv_decl_null_works=yes],
23 [gl_cv_decl_null_works=no])])
24 if test $gl_cv_decl_null_works = no; then
25 REPLACE_NULL=1
26 STDDEF_H=stddef.h
27 fi
28 AC_SUBST([STDDEF_H])
29 AM_CONDITIONAL([GL_GENERATE_STDDEF_H], [test -n "$STDDEF_H"])
30 if test -n "$STDDEF_H"; then
31 gl_NEXT_HEADERS([stddef.h])
32 fi
33])
34
35AC_DEFUN([gl_STDDEF_MODULE_INDICATOR],
36[
37 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
38 AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
39 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
40])
41
42AC_DEFUN([gl_STDDEF_H_DEFAULTS],
43[
44 dnl Assume proper GNU behavior unless another module says otherwise.
45 REPLACE_NULL=0; AC_SUBST([REPLACE_NULL])
46 HAVE_WCHAR_T=1; AC_SUBST([HAVE_WCHAR_T])
47])
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