1/* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues. 2 3 Copyright (C) 2009-2012 Free Software Foundation, Inc. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3, or (at your option) 8 any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, see <http://www.gnu.org/licenses/>. */ 17 18/* Written by Eric Blake. */ 19 20/* 21 * POSIX 2008 <stddef.h> for platforms that have issues. 22 * <http://www.opengroup.org/susv3xbd/stddef.h.html> 23 */ 24 25#if __GNUC__ >= 3 26@PRAGMA_SYSTEM_HEADER@ 27#endif 28@PRAGMA_COLUMNS@ 29 30#if defined __need_wchar_t || defined __need_size_t \ 31 || defined __need_ptrdiff_t || defined __need_NULL \ 32 || defined __need_wint_t 33/* Special invocation convention inside gcc header files. In 34 particular, gcc provides a version of <stddef.h> that blindly 35 redefines NULL even when __need_wint_t was defined, even though 36 wint_t is not normally provided by <stddef.h>. Hence, we must 37 remember if special invocation has ever been used to obtain wint_t, 38 in which case we need to clean up NULL yet again. */ 39 40# if !(defined _@GUARD_PREFIX@_STDDEF_H && defined _GL_STDDEF_WINT_T) 41# ifdef __need_wint_t 42# undef _@GUARD_PREFIX@_STDDEF_H 43# define _GL_STDDEF_WINT_T 44# endif 45# @INCLUDE_NEXT@ @NEXT_STDDEF_H@ 46# endif 47 48#else 49/* Normal invocation convention. */ 50 51# ifndef _@GUARD_PREFIX@_STDDEF_H 52 53/* The include_next requires a split double-inclusion guard. */ 54 55# @INCLUDE_NEXT@ @NEXT_STDDEF_H@ 56 57# ifndef _@GUARD_PREFIX@_STDDEF_H 58# define _@GUARD_PREFIX@_STDDEF_H 59 60/* On NetBSD 5.0, the definition of NULL lacks proper parentheses. */ 61#if @REPLACE_NULL@ 62# undef NULL 63# ifdef __cplusplus 64 /* ISO C++ says that the macro NULL must expand to an integer constant 65 expression, hence '((void *) 0)' is not allowed in C++. */ 66# if __GNUG__ >= 3 67 /* GNU C++ has a __null macro that behaves like an integer ('int' or 68 'long') but has the same size as a pointer. Use that, to avoid 69 warnings. */ 70# define NULL __null 71# else 72# define NULL 0L 73# endif 74# else 75# define NULL ((void *) 0) 76# endif 77#endif 78 79/* Some platforms lack wchar_t. */ 80#if !@HAVE_WCHAR_T@ 81# define wchar_t int 82#endif 83 84# endif /* _@GUARD_PREFIX@_STDDEF_H */ 85# endif /* _@GUARD_PREFIX@_STDDEF_H */ 86#endif /* __need_XXX */ 87