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1 | dnl A placeholder for POSIX 2008 <stddef.h>, for platforms that have issues. |
2 | # stddef_h.m4 serial 2 | |
3 | dnl Copyright (C) 2009, 2010 Free Software Foundation, Inc. | |
4 | dnl This file is free software; the Free Software Foundation | |
5 | dnl gives unlimited permission to copy and/or distribute it, | |
6 | dnl with or without modifications, as long as this notice is preserved. | |
7 | ||
8 | AC_DEFUN([gl_STDDEF_H], | |
9 | [ | |
10 | AC_REQUIRE([gl_STDDEF_H_DEFAULTS]) | |
11 | AC_REQUIRE([gt_TYPE_WCHAR_T]) | |
12 | if test $gt_cv_c_wchar_t = no; then | |
13 | HAVE_WCHAR_T=0 | |
14 | STDDEF_H=stddef.h | |
15 | fi | |
16 | AC_CACHE_CHECK([whether NULL can be used in arbitrary expressions], | |
17 | [gl_cv_decl_null_works], | |
18 | [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stddef.h> | |
19 | int test[2 * (sizeof NULL == sizeof (void *)) -1]; | |
20 | ]])], | |
21 | [gl_cv_decl_null_works=yes], | |
22 | [gl_cv_decl_null_works=no])]) | |
23 | if test $gl_cv_decl_null_works = no; then | |
24 | REPLACE_NULL=1 | |
25 | STDDEF_H=stddef.h | |
26 | fi | |
27 | if test -n "$STDDEF_H"; then | |
28 | gl_CHECK_NEXT_HEADERS([stddef.h]) | |
29 | fi | |
30 | ]) | |
31 | ||
32 | AC_DEFUN([gl_STDDEF_MODULE_INDICATOR], | |
33 | [ | |
34 | dnl Use AC_REQUIRE here, so that the default settings are expanded once only. | |
35 | AC_REQUIRE([gl_STDDEF_H_DEFAULTS]) | |
36 | gl_MODULE_INDICATOR_SET_VARIABLE([$1]) | |
37 | ]) | |
38 | ||
39 | AC_DEFUN([gl_STDDEF_H_DEFAULTS], | |
40 | [ | |
41 | dnl Assume proper GNU behavior unless another module says otherwise. | |
42 | REPLACE_NULL=0; AC_SUBST([REPLACE_NULL]) | |
43 | HAVE_WCHAR_T=1; AC_SUBST([HAVE_WCHAR_T]) | |
44 | STDDEF_H=''; AC_SUBST([STDDEF_H]) | |
45 | ]) |