| 1 | dnl A placeholder for POSIX 2008 <stddef.h>, for platforms that have issues.
|
|---|
| 2 | # stddef_h.m4 serial 4
|
|---|
| 3 | dnl Copyright (C) 2009-2012 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 | 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 |
|
|---|
| 35 | AC_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 |
|
|---|
| 42 | AC_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 | ])
|
|---|