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1 dnl A placeholder for POSIX 2008 <stddef.h>, for platforms that have issues.
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2 # stddef_h.m4 serial 1
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3 dnl Copyright (C) 2009, 2010 Free Software Foundation, Inc.
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4 dnl This file is free software; the Free Software Foundation
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5 dnl gives unlimited permission to copy and/or distribute it,
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6 dnl with or without modifications, as long as this notice is preserved.
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7
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8 AC_DEFUN([gl_STDDEF_H],
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9 [
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10 AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
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11 AC_REQUIRE([gt_TYPE_WCHAR_T])
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12 if test $gt_cv_c_wchar_t = no; then
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13 HAVE_WCHAR_T=0
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14 STDDEF_H=stddef.h
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15 fi
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16 AC_CACHE_CHECK([whether NULL can be used in arbitrary expressions],
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17 [gl_cv_decl_null_works],
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18 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stddef.h>
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19 int test[2 * (sizeof NULL == sizeof (void *)) -1];
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20 ]])],
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21 [gl_cv_decl_null_works=yes],
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22 [gl_cv_decl_null_works=no])])
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23 if test $gl_cv_decl_null_works = no; then
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24 REPLACE_NULL=1
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25 STDDEF_H=stddef.h
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26 fi
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27 if test -n "$STDDEF_H"; then
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28 gl_CHECK_NEXT_HEADERS([stddef.h])
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29 fi
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30 ])
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31
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32 AC_DEFUN([gl_STDDEF_MODULE_INDICATOR],
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33 [
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34 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
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35 AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
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36 GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
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37 ])
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38
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39 AC_DEFUN([gl_STDDEF_H_DEFAULTS],
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40 [
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41 dnl Assume proper GNU behavior unless another module says otherwise.
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42 REPLACE_NULL=0; AC_SUBST([REPLACE_NULL])
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43 HAVE_WCHAR_T=1; AC_SUBST([HAVE_WCHAR_T])
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44 STDDEF_H=''; AC_SUBST([STDDEF_H])
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45 ])
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