1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
/* A substitute for POSIX 2008 <stddef.h>, for platforms that have issues.
Copyright (C) 2009-2024 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Eric Blake. */
/*
* POSIX 2008 and ISO C 23 <stddef.h> for platforms that have issues.
* <https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/stddef.h.html>
*/
#if __GNUC__ >= 3
@PRAGMA_SYSTEM_HEADER@
#endif
@PRAGMA_COLUMNS@
#if defined __need_wchar_t || defined __need_size_t \
|| defined __need_ptrdiff_t || defined __need_NULL \
|| defined __need_wint_t
/* Special invocation convention inside gcc header files. In
particular, gcc provides a version of <stddef.h> that blindly
redefines NULL even when __need_wint_t was defined, even though
wint_t is not normally provided by <stddef.h>. Hence, we must
remember if special invocation has ever been used to obtain wint_t,
in which case we need to clean up NULL yet again. */
# if !(defined _@GUARD_PREFIX@_STDDEF_H && defined _@GUARD_PREFIX@_STDDEF_WINT_T)
# ifdef __need_wint_t
# define _@GUARD_PREFIX@_STDDEF_WINT_T
# endif
# @INCLUDE_NEXT@ @NEXT_STDDEF_H@
/* On TinyCC, make sure that the macros that indicate the special invocation
convention get undefined. */
# undef __need_wchar_t
# undef __need_size_t
# undef __need_ptrdiff_t
# undef __need_NULL
# undef __need_wint_t
# endif
#else
/* Normal invocation convention. */
# ifndef _@GUARD_PREFIX@_STDDEF_H
/* On AIX 7.2, with xlc in 64-bit mode, <stddef.h> defines max_align_t to a
type with alignment 4, but 'long' has alignment 8. */
# if defined _AIX && defined __LP64__ && !@HAVE_MAX_ALIGN_T@
# if !GNULIB_defined_max_align_t
# ifdef _MAX_ALIGN_T
/* /usr/include/stddef.h has already defined max_align_t. Override it. */
typedef long rpl_max_align_t;
# define max_align_t rpl_max_align_t
# else
/* Prevent /usr/include/stddef.h from defining max_align_t. */
typedef long max_align_t;
# define _MAX_ALIGN_T
# endif
# define __CLANG_MAX_ALIGN_T_DEFINED
# define GNULIB_defined_max_align_t 1
# endif
# endif
/* The include_next requires a split double-inclusion guard. */
# @INCLUDE_NEXT@ @NEXT_STDDEF_H@
/* On NetBSD 5.0, the definition of NULL lacks proper parentheses. */
# if (@REPLACE_NULL@ \
&& (!defined _@GUARD_PREFIX@_STDDEF_H || defined _@GUARD_PREFIX@_STDDEF_WINT_T))
# undef NULL
# ifdef __cplusplus
/* ISO C++ says that the macro NULL must expand to an integer constant
expression, hence '((void *) 0)' is not allowed in C++. */
# if __GNUG__ >= 3
/* GNU C++ has a __null macro that behaves like an integer ('int' or
'long') but has the same size as a pointer. Use that, to avoid
warnings. */
# define NULL __null
# else
# define NULL 0L
# endif
# else
# define NULL ((void *) 0)
# endif
# endif
# ifndef _@GUARD_PREFIX@_STDDEF_H
# define _@GUARD_PREFIX@_STDDEF_H
/* This file uses _Noreturn, _GL_ATTRIBUTE_NOTHROW. */
#if !_GL_CONFIG_H_INCLUDED
#error "Please include config.h first."
#endif
/* _GL_ATTRIBUTE_NOTHROW declares that the function does not throw exceptions.
*/
#ifndef _GL_ATTRIBUTE_NOTHROW
# if defined __cplusplus
# if (__GNUC__ + (__GNUC_MINOR__ >= 8) > 2) || __clang_major >= 4
# if __cplusplus >= 201103L
# define _GL_ATTRIBUTE_NOTHROW noexcept (true)
# else
# define _GL_ATTRIBUTE_NOTHROW throw ()
# endif
# else
# define _GL_ATTRIBUTE_NOTHROW
# endif
# else
# if (__GNUC__ + (__GNUC_MINOR__ >= 3) > 3) || defined __clang__
# define _GL_ATTRIBUTE_NOTHROW __attribute__ ((__nothrow__))
# else
# define _GL_ATTRIBUTE_NOTHROW
# endif
# endif
#endif
/* Some platforms lack wchar_t. */
#if !@HAVE_WCHAR_T@
# define wchar_t int
#endif
/* Some platforms lack max_align_t. The check for _GCC_MAX_ALIGN_T is
a hack in case the configure-time test was done with g++ even though
we are currently compiling with gcc.
On MSVC, max_align_t is defined only in C++ mode, after <cstddef> was
included. Its definition is good since it has an alignment of 8 (on x86
and x86_64).
Similarly on OS/2 kLIBC. */
#if (defined _MSC_VER || (defined __KLIBC__ && !defined __LIBCN__)) \
&& defined __cplusplus
# include <cstddef>
#else
# if ! (@HAVE_MAX_ALIGN_T@ || (defined _GCC_MAX_ALIGN_T && !defined __clang__))
# if !GNULIB_defined_max_align_t
/* On the x86, the maximum storage alignment of double, long, etc. is 4,
but GCC's C11 ABI for x86 says that max_align_t has an alignment of 8,
and the C11 standard allows this. Work around this problem by
using __alignof__ (which returns 8 for double) rather than _Alignof
(which returns 4), and align each union member accordingly. */
# if defined __GNUC__ || (__clang_major__ >= 4)
# define _GL_STDDEF_ALIGNAS(type) \
__attribute__ ((__aligned__ (__alignof__ (type))))
# else
# define _GL_STDDEF_ALIGNAS(type) /* */
# endif
typedef union
{
char *__p _GL_STDDEF_ALIGNAS (char *);
double __d _GL_STDDEF_ALIGNAS (double);
long double __ld _GL_STDDEF_ALIGNAS (long double);
long int __i _GL_STDDEF_ALIGNAS (long int);
} rpl_max_align_t;
# define max_align_t rpl_max_align_t
# define __CLANG_MAX_ALIGN_T_DEFINED
# define GNULIB_defined_max_align_t 1
# endif
# endif
#endif
/* ISO C 23 ยง 7.21.1 The unreachable macro */
#ifndef unreachable
/* Code borrowed from verify.h. */
# ifndef _GL_HAS_BUILTIN_UNREACHABLE
# if defined __clang_major__ && __clang_major__ < 5
# define _GL_HAS_BUILTIN_UNREACHABLE 0
# elif 4 < __GNUC__ + (5 <= __GNUC_MINOR__)
# define _GL_HAS_BUILTIN_UNREACHABLE 1
# elif defined __has_builtin
# define _GL_HAS_BUILTIN_UNREACHABLE __has_builtin (__builtin_unreachable)
# else
# define _GL_HAS_BUILTIN_UNREACHABLE 0
# endif
# endif
# if _GL_HAS_BUILTIN_UNREACHABLE
# define unreachable() __builtin_unreachable ()
# elif 1200 <= _MSC_VER
# define unreachable() __assume (0)
# else
/* Declare abort(), without including <stdlib.h>. */
extern
# if defined __cplusplus
"C"
# endif
_Noreturn
void abort (void)
# if defined __cplusplus && (__GLIBC__ >= 2)
_GL_ATTRIBUTE_NOTHROW
# endif
;
# define unreachable() abort ()
# endif
#endif
# endif /* _@GUARD_PREFIX@_STDDEF_H */
# endif /* _@GUARD_PREFIX@_STDDEF_H */
#endif /* __need_XXX */
|
