gsasl  1.10.0
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stddef.in.h
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1 /* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues.
2 
3  Copyright (C) 2009-2021 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 <https://www.gnu.org/licenses/>. */
17 
18 /* Written by Eric Blake. */
19 
20 /*
21  * POSIX 2008 <stddef.h> for platforms that have issues.
22  * <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/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 # define _GL_STDDEF_WINT_T
43 # endif
44 # @INCLUDE_NEXT@ @NEXT_STDDEF_H@
45 # endif
46 
47 #else
48 /* Normal invocation convention. */
49 
50 # ifndef _@GUARD_PREFIX@_STDDEF_H
51 
52 /* The include_next requires a split double-inclusion guard. */
53 
54 # @INCLUDE_NEXT@ @NEXT_STDDEF_H@
55 
56 /* On NetBSD 5.0, the definition of NULL lacks proper parentheses. */
57 # if (@REPLACE_NULL@ \
58  && (!defined _@GUARD_PREFIX@_STDDEF_H || defined _GL_STDDEF_WINT_T))
59 # undef NULL
60 # ifdef __cplusplus
61  /* ISO C++ says that the macro NULL must expand to an integer constant
62  expression, hence '((void *) 0)' is not allowed in C++. */
63 # if __GNUG__ >= 3
64  /* GNU C++ has a __null macro that behaves like an integer ('int' or
65  'long') but has the same size as a pointer. Use that, to avoid
66  warnings. */
67 # define NULL __null
68 # else
69 # define NULL 0L
70 # endif
71 # else
72 # define NULL ((void *) 0)
73 # endif
74 # endif
75 
76 # ifndef _@GUARD_PREFIX@_STDDEF_H
77 # define _@GUARD_PREFIX@_STDDEF_H
78 
79 /* Some platforms lack wchar_t. */
80 #if !@HAVE_WCHAR_T@
81 # define wchar_t int
82 #endif
83 
84 /* Some platforms lack max_align_t. The check for _GCC_MAX_ALIGN_T is
85  a hack in case the configure-time test was done with g++ even though
86  we are currently compiling with gcc.
87  On MSVC, max_align_t is defined only in C++ mode, after <cstddef> was
88  included. Its definition is good since it has an alignment of 8 (on x86
89  and x86_64). */
90 #if defined _MSC_VER && defined __cplusplus
91 # include <cstddef>
92 #else
93 # if ! (@HAVE_MAX_ALIGN_T@ || defined _GCC_MAX_ALIGN_T)
94 # if !GNULIB_defined_max_align_t
95 /* On the x86, the maximum storage alignment of double, long, etc. is 4,
96  but GCC's C11 ABI for x86 says that max_align_t has an alignment of 8,
97  and the C11 standard allows this. Work around this problem by
98  using __alignof__ (which returns 8 for double) rather than _Alignof
99  (which returns 4), and align each union member accordingly. */
100 # if defined __GNUC__ || (__clang_major__ >= 4)
101 # define _GL_STDDEF_ALIGNAS(type) \
102  __attribute__ ((__aligned__ (__alignof__ (type))))
103 # else
104 # define _GL_STDDEF_ALIGNAS(type) /* */
105 # endif
106 typedef union
107 {
108  char *__p _GL_STDDEF_ALIGNAS (char *);
109  double __d _GL_STDDEF_ALIGNAS (double);
110  long double __ld _GL_STDDEF_ALIGNAS (long double);
111  long int __i _GL_STDDEF_ALIGNAS (long int);
113 # define max_align_t rpl_max_align_t
114 # define GNULIB_defined_max_align_t 1
115 # endif
116 # endif
117 #endif
118 
119 # endif /* _@GUARD_PREFIX@_STDDEF_H */
120 # endif /* _@GUARD_PREFIX@_STDDEF_H */
121 #endif /* __need_XXX */
#define _GL_STDDEF_ALIGNAS(type)
Definition: stddef.in.h:104