1dnl A placeholder for POSIX 2008 <stddef.h>, for platforms that have issues. 2# stddef_h.m4 serial 1 3dnl Copyright (C) 2009 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 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 32AC_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 GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1 37]) 38 39AC_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]) 46