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