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, write to the Free Software Foundation, 17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 18 19 /* Written by Eric Blake. */ 20 21 /* 22 * POSIX 2008 <stddef.h> for platforms that have issues. 23 * <http://www.opengroup.org/susv3xbd/stddef.h.html> 24 */ 25 26 #if __GNUC__ >= 3 27 @PRAGMA_SYSTEM_HEADER@ 28 #endif 29 @PRAGMA_COLUMNS@ 30 31 #if defined __need_wchar_t || defined __need_size_t \ 32 || defined __need_ptrdiff_t || defined __need_NULL \ 33 || defined __need_wint_t 34 /* Special invocation convention inside gcc header files. In 35 particular, gcc provides a version of <stddef.h> that blindly 36 redefines NULL even when __need_wint_t was defined, even though 37 wint_t is not normally provided by <stddef.h>. Hence, we must 38 remember if special invocation has ever been used to obtain wint_t, 39 in which case we need to clean up NULL yet again. */ 40 41 # if !(defined _@GUARD_PREFIX@_STDDEF_H && defined _GL_STDDEF_WINT_T) 42 # ifdef __need_wint_t 43 # undef _@GUARD_PREFIX@_STDDEF_H 44 # define _GL_STDDEF_WINT_T 45 # endif 46 # @INCLUDE_NEXT@ @NEXT_STDDEF_H@ 47 # endif 48 49 #else 50 /* Normal invocation convention. */ 51 52 # ifndef _@GUARD_PREFIX@_STDDEF_H 53 54 /* The include_next requires a split double-inclusion guard. */ 55 56 # @INCLUDE_NEXT@ @NEXT_STDDEF_H@ 57 58 # ifndef _@GUARD_PREFIX@_STDDEF_H 59 # define _@GUARD_PREFIX@_STDDEF_H 60 61 /* On NetBSD 5.0, the definition of NULL lacks proper parentheses. */ 62 #if @REPLACE_NULL@ 63 # undef NULL 64 # ifdef __cplusplus 65 /* ISO C++ says that the macro NULL must expand to an integer constant 66 expression, hence '((void *) 0)' is not allowed in C++. */ 67 # if __GNUG__ >= 3 68 /* GNU C++ has a __null macro that behaves like an integer ('int' or 69 'long') but has the same size as a pointer. Use that, to avoid 70 warnings. */ 71 # define NULL __null 72 # else 73 # define NULL 0L 74 # endif 75 # else 76 # define NULL ((void *) 0) 77 # endif 78 #endif 79 80 /* Some platforms lack wchar_t. */ 81 #if !@HAVE_WCHAR_T@ 82 # define wchar_t int 83 #endif 84 85 # endif /* _@GUARD_PREFIX@_STDDEF_H */ 86 # endif /* _@GUARD_PREFIX@_STDDEF_H */ 87 #endif /* __need_XXX */ 88