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f434ba03 PA |
1 | /* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues. |
2 | ||
db026a31 | 3 | Copyright (C) 2009, 2010 Free Software Foundation, Inc. |
f434ba03 PA |
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 | ||
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 _GL_STDDEF_H && defined _GL_STDDEF_WINT_T) | |
41 | # ifdef __need_wint_t | |
42 | # undef _GL_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 _GL_STDDEF_H | |
52 | ||
53 | /* The include_next requires a split double-inclusion guard. */ | |
54 | ||
55 | # @INCLUDE_NEXT@ @NEXT_STDDEF_H@ | |
56 | ||
57 | # ifndef _GL_STDDEF_H | |
58 | # define _GL_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 /* _GL_STDDEF_H */ | |
85 | # endif /* _GL_STDDEF_H */ | |
86 | #endif /* __need_XXX */ |