| 1 | /* Copyright (C) 1992-2021 Free Software Foundation, Inc.
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| 2 | This file is part of the GNU C Library.
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| 3 |
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| 4 | The GNU C Library is free software; you can redistribute it and/or
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| 5 | modify it under the terms of the GNU Lesser General Public
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| 6 | License as published by the Free Software Foundation; either
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| 7 | version 2.1 of the License, or (at your option) any later version.
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| 8 |
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| 9 | The GNU C Library is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 12 | Lesser General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU Lesser General Public
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| 15 | License along with the GNU C Library; if not, see
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| 16 | <https://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | #ifndef _SYS_CDEFS_H
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| 19 | #define _SYS_CDEFS_H 1
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| 20 |
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| 21 | /* We are almost always included from features.h. */
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| 22 | #ifndef _FEATURES_H
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| 23 | # include <features.h>
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| 24 | #endif
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| 25 |
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| 26 | /* The GNU libc does not support any K&R compilers or the traditional mode
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| 27 | of ISO C compilers anymore. Check for some of the combinations not
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| 28 | supported anymore. */
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| 29 | #if defined __GNUC__ && !defined __STDC__
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| 30 | # error "You need a ISO C conforming compiler to use the glibc headers"
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| 31 | #endif
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| 32 |
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| 33 | /* Some user header file might have defined this before. */
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| 34 | #undef __P
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| 35 | #undef __PMT
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| 36 |
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| 37 | /* Compilers that lack __has_attribute may object to
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| 38 | #if defined __has_attribute && __has_attribute (...)
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| 39 | even though they do not need to evaluate the right-hand side of the &&.
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| 40 | Similarly for __has_builtin, etc. */
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| 41 | #if (defined __has_attribute \
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| 42 | && (!defined __clang_minor__ \
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| 43 | || 3 < __clang_major__ + (5 <= __clang_minor__)))
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| 44 | # define __glibc_has_attribute(attr) __has_attribute (attr)
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| 45 | #else
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| 46 | # define __glibc_has_attribute(attr) 0
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| 47 | #endif
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| 48 | #ifdef __has_builtin
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| 49 | # define __glibc_has_builtin(name) __has_builtin (name)
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| 50 | #else
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| 51 | # define __glibc_has_builtin(name) 0
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| 52 | #endif
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| 53 | #ifdef __has_extension
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| 54 | # define __glibc_has_extension(ext) __has_extension (ext)
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| 55 | #else
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| 56 | # define __glibc_has_extension(ext) 0
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| 57 | #endif
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| 58 |
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| 59 | #if defined __GNUC__ || defined __clang__
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| 60 |
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| 61 | /* All functions, except those with callbacks or those that
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| 62 | synchronize memory, are leaf functions. */
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| 63 | # if __GNUC_PREREQ (4, 6) && !defined _LIBC
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| 64 | # define __LEAF , __leaf__
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| 65 | # define __LEAF_ATTR __attribute__ ((__leaf__))
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| 66 | # else
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| 67 | # define __LEAF
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| 68 | # define __LEAF_ATTR
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| 69 | # endif
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| 70 |
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| 71 | /* GCC can always grok prototypes. For C++ programs we add throw()
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| 72 | to help it optimize the function calls. But this only works with
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| 73 | gcc 2.8.x and egcs. For gcc 3.4 and up we even mark C functions
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| 74 | as non-throwing using a function attribute since programs can use
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| 75 | the -fexceptions options for C code as well. */
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| 76 | # if !defined __cplusplus \
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| 77 | && (__GNUC_PREREQ (3, 4) || __glibc_has_attribute (__nothrow__))
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| 78 | # define __THROW __attribute__ ((__nothrow__ __LEAF))
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| 79 | # define __THROWNL __attribute__ ((__nothrow__))
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| 80 | # define __NTH(fct) __attribute__ ((__nothrow__ __LEAF)) fct
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| 81 | # define __NTHNL(fct) __attribute__ ((__nothrow__)) fct
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| 82 | # else
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| 83 | # if defined __cplusplus && (__GNUC_PREREQ (2,8) || __clang_major >= 4)
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| 84 | # if __cplusplus >= 201103L
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| 85 | # define __THROW noexcept (true)
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| 86 | # else
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| 87 | # define __THROW throw ()
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| 88 | # endif
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| 89 | # define __THROWNL __THROW
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| 90 | # define __NTH(fct) __LEAF_ATTR fct __THROW
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| 91 | # define __NTHNL(fct) fct __THROW
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| 92 | # else
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| 93 | # define __THROW
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| 94 | # define __THROWNL
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| 95 | # define __NTH(fct) fct
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| 96 | # define __NTHNL(fct) fct
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| 97 | # endif
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| 98 | # endif
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| 99 |
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| 100 | #else /* Not GCC or clang. */
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| 101 |
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| 102 | # if (defined __cplusplus \
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| 103 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
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| 104 | # define __inline inline
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| 105 | # else
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| 106 | # define __inline /* No inline functions. */
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| 107 | # endif
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| 108 |
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| 109 | # define __THROW
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| 110 | # define __THROWNL
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| 111 | # define __NTH(fct) fct
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| 112 |
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| 113 | #endif /* GCC || clang. */
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| 114 |
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| 115 | /* These two macros are not used in glibc anymore. They are kept here
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| 116 | only because some other projects expect the macros to be defined. */
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| 117 | #define __P(args) args
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| 118 | #define __PMT(args) args
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| 119 |
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| 120 | /* For these things, GCC behaves the ANSI way normally,
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| 121 | and the non-ANSI way under -traditional. */
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| 122 |
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| 123 | #define __CONCAT(x,y) x ## y
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| 124 | #define __STRING(x) #x
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| 125 |
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| 126 | /* This is not a typedef so `const __ptr_t' does the right thing. */
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| 127 | #define __ptr_t void *
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| 128 |
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| 129 |
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| 130 | /* C++ needs to know that types and declarations are C, not C++. */
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| 131 | #ifdef __cplusplus
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| 132 | # define __BEGIN_DECLS extern "C" {
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| 133 | # define __END_DECLS }
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| 134 | #else
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| 135 | # define __BEGIN_DECLS
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| 136 | # define __END_DECLS
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| 137 | #endif
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| 138 |
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| 139 |
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| 140 | /* Fortify support. */
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| 141 | #define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1)
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| 142 | #define __bos0(ptr) __builtin_object_size (ptr, 0)
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| 143 |
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| 144 | /* Use __builtin_dynamic_object_size at _FORTIFY_SOURCE=3 when available. */
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| 145 | #if __USE_FORTIFY_LEVEL == 3 && __glibc_clang_prereq (9, 0)
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| 146 | # define __glibc_objsize0(__o) __builtin_dynamic_object_size (__o, 0)
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| 147 | # define __glibc_objsize(__o) __builtin_dynamic_object_size (__o, 1)
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| 148 | #else
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| 149 | # define __glibc_objsize0(__o) __bos0 (__o)
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| 150 | # define __glibc_objsize(__o) __bos (__o)
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| 151 | #endif
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| 152 |
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| 153 | #if __GNUC_PREREQ (4,3)
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| 154 | # define __warnattr(msg) __attribute__((__warning__ (msg)))
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| 155 | # define __errordecl(name, msg) \
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| 156 | extern void name (void) __attribute__((__error__ (msg)))
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| 157 | #else
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| 158 | # define __warnattr(msg)
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| 159 | # define __errordecl(name, msg) extern void name (void)
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| 160 | #endif
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| 161 |
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| 162 | /* Support for flexible arrays.
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| 163 | Headers that should use flexible arrays only if they're "real"
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| 164 | (e.g. only if they won't affect sizeof()) should test
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| 165 | #if __glibc_c99_flexarr_available. */
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| 166 | #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L && !defined __HP_cc
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| 167 | # define __flexarr []
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| 168 | # define __glibc_c99_flexarr_available 1
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| 169 | #elif __GNUC_PREREQ (2,97) || defined __clang__
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| 170 | /* GCC 2.97 and clang support C99 flexible array members as an extension,
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| 171 | even when in C89 mode or compiling C++ (any version). */
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| 172 | # define __flexarr []
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| 173 | # define __glibc_c99_flexarr_available 1
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| 174 | #elif defined __GNUC__
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| 175 | /* Pre-2.97 GCC did not support C99 flexible arrays but did have
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| 176 | an equivalent extension with slightly different notation. */
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| 177 | # define __flexarr [0]
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| 178 | # define __glibc_c99_flexarr_available 1
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| 179 | #else
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| 180 | /* Some other non-C99 compiler. Approximate with [1]. */
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| 181 | # define __flexarr [1]
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| 182 | # define __glibc_c99_flexarr_available 0
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| 183 | #endif
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| 184 |
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| 185 |
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| 186 | /* __asm__ ("xyz") is used throughout the headers to rename functions
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| 187 | at the assembly language level. This is wrapped by the __REDIRECT
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| 188 | macro, in order to support compilers that can do this some other
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| 189 | way. When compilers don't support asm-names at all, we have to do
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| 190 | preprocessor tricks instead (which don't have exactly the right
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| 191 | semantics, but it's the best we can do).
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| 192 |
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| 193 | Example:
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| 194 | int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */
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| 195 |
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| 196 | #if (defined __GNUC__ && __GNUC__ >= 2) || (__clang_major__ >= 4)
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| 197 |
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| 198 | # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias))
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| 199 | # ifdef __cplusplus
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| 200 | # define __REDIRECT_NTH(name, proto, alias) \
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| 201 | name proto __THROW __asm__ (__ASMNAME (#alias))
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| 202 | # define __REDIRECT_NTHNL(name, proto, alias) \
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| 203 | name proto __THROWNL __asm__ (__ASMNAME (#alias))
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| 204 | # else
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| 205 | # define __REDIRECT_NTH(name, proto, alias) \
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| 206 | name proto __asm__ (__ASMNAME (#alias)) __THROW
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| 207 | # define __REDIRECT_NTHNL(name, proto, alias) \
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| 208 | name proto __asm__ (__ASMNAME (#alias)) __THROWNL
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| 209 | # endif
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| 210 | # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
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| 211 | # define __ASMNAME2(prefix, cname) __STRING (prefix) cname
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| 212 |
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| 213 | /*
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| 214 | #elif __SOME_OTHER_COMPILER__
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| 215 |
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| 216 | # define __REDIRECT(name, proto, alias) name proto; \
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| 217 | _Pragma("let " #name " = " #alias)
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| 218 | */
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| 219 | #endif
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| 220 |
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| 221 | /* GCC and clang have various useful declarations that can be made with
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| 222 | the '__attribute__' syntax. All of the ways we use this do fine if
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| 223 | they are omitted for compilers that don't understand it. */
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| 224 | #if !(defined __GNUC__ || defined __clang__)
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| 225 | # define __attribute__(xyz) /* Ignore */
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| 226 | #endif
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| 227 |
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| 228 | /* At some point during the gcc 2.96 development the `malloc' attribute
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| 229 | for functions was introduced. We don't want to use it unconditionally
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| 230 | (although this would be possible) since it generates warnings. */
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| 231 | #if __GNUC_PREREQ (2,96) || __glibc_has_attribute (__malloc__)
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| 232 | # define __attribute_malloc__ __attribute__ ((__malloc__))
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| 233 | #else
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| 234 | # define __attribute_malloc__ /* Ignore */
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| 235 | #endif
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| 236 |
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| 237 | /* Tell the compiler which arguments to an allocation function
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| 238 | indicate the size of the allocation. */
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| 239 | #if __GNUC_PREREQ (4, 3)
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| 240 | # define __attribute_alloc_size__(params) \
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| 241 | __attribute__ ((__alloc_size__ params))
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| 242 | #else
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| 243 | # define __attribute_alloc_size__(params) /* Ignore. */
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| 244 | #endif
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| 245 |
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| 246 | /* At some point during the gcc 2.96 development the `pure' attribute
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| 247 | for functions was introduced. We don't want to use it unconditionally
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| 248 | (although this would be possible) since it generates warnings. */
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| 249 | #if __GNUC_PREREQ (2,96) || __glibc_has_attribute (__pure__)
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| 250 | # define __attribute_pure__ __attribute__ ((__pure__))
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| 251 | #else
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| 252 | # define __attribute_pure__ /* Ignore */
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| 253 | #endif
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| 254 |
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| 255 | /* This declaration tells the compiler that the value is constant. */
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| 256 | #if __GNUC_PREREQ (2,5) || __glibc_has_attribute (__const__)
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| 257 | # define __attribute_const__ __attribute__ ((__const__))
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| 258 | #else
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| 259 | # define __attribute_const__ /* Ignore */
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| 260 | #endif
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| 261 |
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| 262 | #if __GNUC_PREREQ (2,7) || __glibc_has_attribute (__unused__)
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| 263 | # define __attribute_maybe_unused__ __attribute__ ((__unused__))
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| 264 | /* Once the next version of the C standard comes out, we can
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| 265 | do something like the following here:
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| 266 | #elif defined __STDC_VERSION__ && 202???L <= __STDC_VERSION__
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| 267 | # define __attribute_maybe_unused__ [[__maybe_unused__]] */
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| 268 | #else
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| 269 | # define __attribute_maybe_unused__ /* Ignore */
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| 270 | #endif
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| 271 |
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| 272 | /* At some point during the gcc 3.1 development the `used' attribute
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| 273 | for functions was introduced. We don't want to use it unconditionally
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| 274 | (although this would be possible) since it generates warnings. */
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| 275 | #if __GNUC_PREREQ (3,1) || __glibc_has_attribute (__used__)
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| 276 | # define __attribute_used__ __attribute__ ((__used__))
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| 277 | # define __attribute_noinline__ __attribute__ ((__noinline__))
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| 278 | #else
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| 279 | # define __attribute_used__ __attribute__ ((__unused__))
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| 280 | # define __attribute_noinline__ /* Ignore */
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| 281 | #endif
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| 282 |
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| 283 | /* Since version 3.2, gcc allows marking deprecated functions. */
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| 284 | #if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__deprecated__)
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| 285 | # define __attribute_deprecated__ __attribute__ ((__deprecated__))
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| 286 | #else
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| 287 | # define __attribute_deprecated__ /* Ignore */
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| 288 | #endif
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| 289 |
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| 290 | /* Since version 4.5, gcc also allows one to specify the message printed
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| 291 | when a deprecated function is used. clang claims to be gcc 4.2, but
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| 292 | may also support this feature. */
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| 293 | #if __GNUC_PREREQ (4,5) \
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| 294 | || __glibc_has_extension (__attribute_deprecated_with_message__)
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| 295 | # define __attribute_deprecated_msg__(msg) \
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| 296 | __attribute__ ((__deprecated__ (msg)))
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| 297 | #else
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| 298 | # define __attribute_deprecated_msg__(msg) __attribute_deprecated__
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| 299 | #endif
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| 300 |
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| 301 | /* At some point during the gcc 2.8 development the `format_arg' attribute
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| 302 | for functions was introduced. We don't want to use it unconditionally
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| 303 | (although this would be possible) since it generates warnings.
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| 304 | If several `format_arg' attributes are given for the same function, in
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| 305 | gcc-3.0 and older, all but the last one are ignored. In newer gccs,
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| 306 | all designated arguments are considered. */
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| 307 | #if __GNUC_PREREQ (2,8) || __glibc_has_attribute (__format_arg__)
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| 308 | # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
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| 309 | #else
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| 310 | # define __attribute_format_arg__(x) /* Ignore */
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| 311 | #endif
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| 312 |
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| 313 | /* At some point during the gcc 2.97 development the `strfmon' format
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| 314 | attribute for functions was introduced. We don't want to use it
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| 315 | unconditionally (although this would be possible) since it
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| 316 | generates warnings. */
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| 317 | #if __GNUC_PREREQ (2,97) || __glibc_has_attribute (__format__)
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| 318 | # define __attribute_format_strfmon__(a,b) \
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| 319 | __attribute__ ((__format__ (__strfmon__, a, b)))
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| 320 | #else
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| 321 | # define __attribute_format_strfmon__(a,b) /* Ignore */
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| 322 | #endif
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| 323 |
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| 324 | /* The nonnull function attribute marks pointer parameters that
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| 325 | must not be NULL. This has the name __nonnull in glibc,
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| 326 | and __attribute_nonnull__ in files shared with Gnulib to avoid
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| 327 | collision with a different __nonnull in DragonFlyBSD 5.9. */
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| 328 | #ifndef __attribute_nonnull__
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| 329 | # if __GNUC_PREREQ (3,3) || __glibc_has_attribute (__nonnull__)
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| 330 | # define __attribute_nonnull__(params) __attribute__ ((__nonnull__ params))
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| 331 | # else
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| 332 | # define __attribute_nonnull__(params)
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| 333 | # endif
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| 334 | #endif
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| 335 | #ifndef __nonnull
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| 336 | # define __nonnull(params) __attribute_nonnull__ (params)
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| 337 | #endif
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| 338 |
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| 339 | /* If fortification mode, we warn about unused results of certain
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| 340 | function calls which can lead to problems. */
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| 341 | #if __GNUC_PREREQ (3,4) || __glibc_has_attribute (__warn_unused_result__)
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| 342 | # define __attribute_warn_unused_result__ \
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| 343 | __attribute__ ((__warn_unused_result__))
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| 344 | # if defined __USE_FORTIFY_LEVEL && __USE_FORTIFY_LEVEL > 0
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| 345 | # define __wur __attribute_warn_unused_result__
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| 346 | # endif
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| 347 | #else
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| 348 | # define __attribute_warn_unused_result__ /* empty */
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| 349 | #endif
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| 350 | #ifndef __wur
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| 351 | # define __wur /* Ignore */
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| 352 | #endif
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| 353 |
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| 354 | /* Forces a function to be always inlined. */
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| 355 | #if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__always_inline__)
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| 356 | /* The Linux kernel defines __always_inline in stddef.h (283d7573), and
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| 357 | it conflicts with this definition. Therefore undefine it first to
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| 358 | allow either header to be included first. */
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| 359 | # undef __always_inline
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| 360 | # define __always_inline __inline __attribute__ ((__always_inline__))
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| 361 | #else
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| 362 | # undef __always_inline
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| 363 | # define __always_inline __inline
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| 364 | #endif
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| 365 |
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| 366 | /* Associate error messages with the source location of the call site rather
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| 367 | than with the source location inside the function. */
|
|---|
| 368 | #if __GNUC_PREREQ (4,3) || __glibc_has_attribute (__artificial__)
|
|---|
| 369 | # define __attribute_artificial__ __attribute__ ((__artificial__))
|
|---|
| 370 | #else
|
|---|
| 371 | # define __attribute_artificial__ /* Ignore */
|
|---|
| 372 | #endif
|
|---|
| 373 |
|
|---|
| 374 | /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
|
|---|
| 375 | inline semantics, unless -fgnu89-inline is used. Using __GNUC_STDC_INLINE__
|
|---|
| 376 | or __GNUC_GNU_INLINE is not a good enough check for gcc because gcc versions
|
|---|
| 377 | older than 4.3 may define these macros and still not guarantee GNU inlining
|
|---|
| 378 | semantics.
|
|---|
| 379 |
|
|---|
| 380 | clang++ identifies itself as gcc-4.2, but has support for GNU inlining
|
|---|
| 381 | semantics, that can be checked for by using the __GNUC_STDC_INLINE_ and
|
|---|
| 382 | __GNUC_GNU_INLINE__ macro definitions. */
|
|---|
| 383 | #if (!defined __cplusplus || __GNUC_PREREQ (4,3) \
|
|---|
| 384 | || (defined __clang__ && (defined __GNUC_STDC_INLINE__ \
|
|---|
| 385 | || defined __GNUC_GNU_INLINE__)))
|
|---|
| 386 | # if defined __GNUC_STDC_INLINE__ || defined __cplusplus
|
|---|
| 387 | # define __extern_inline extern __inline __attribute__ ((__gnu_inline__))
|
|---|
| 388 | # define __extern_always_inline \
|
|---|
| 389 | extern __always_inline __attribute__ ((__gnu_inline__))
|
|---|
| 390 | # else
|
|---|
| 391 | # define __extern_inline extern __inline
|
|---|
| 392 | # define __extern_always_inline extern __always_inline
|
|---|
| 393 | # endif
|
|---|
| 394 | #endif
|
|---|
| 395 |
|
|---|
| 396 | #ifdef __extern_always_inline
|
|---|
| 397 | # define __fortify_function __extern_always_inline __attribute_artificial__
|
|---|
| 398 | #endif
|
|---|
| 399 |
|
|---|
| 400 | /* GCC 4.3 and above allow passing all anonymous arguments of an
|
|---|
| 401 | __extern_always_inline function to some other vararg function. */
|
|---|
| 402 | #if __GNUC_PREREQ (4,3)
|
|---|
| 403 | # define __va_arg_pack() __builtin_va_arg_pack ()
|
|---|
| 404 | # define __va_arg_pack_len() __builtin_va_arg_pack_len ()
|
|---|
| 405 | #endif
|
|---|
| 406 |
|
|---|
| 407 | /* It is possible to compile containing GCC extensions even if GCC is
|
|---|
| 408 | run in pedantic mode if the uses are carefully marked using the
|
|---|
| 409 | `__extension__' keyword. But this is not generally available before
|
|---|
| 410 | version 2.8. */
|
|---|
| 411 | #if !(__GNUC_PREREQ (2,8) || defined __clang__)
|
|---|
| 412 | # define __extension__ /* Ignore */
|
|---|
| 413 | #endif
|
|---|
| 414 |
|
|---|
| 415 | /* __restrict is known in EGCS 1.2 and above, and in clang.
|
|---|
| 416 | It works also in C++ mode (outside of arrays), but only when spelled
|
|---|
| 417 | as '__restrict', not 'restrict'. */
|
|---|
| 418 | #if !(__GNUC_PREREQ (2,92) || __clang_major__ >= 3)
|
|---|
| 419 | # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
|
|---|
| 420 | # define __restrict restrict
|
|---|
| 421 | # else
|
|---|
| 422 | # define __restrict /* Ignore */
|
|---|
| 423 | # endif
|
|---|
| 424 | #endif
|
|---|
| 425 |
|
|---|
| 426 | /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is
|
|---|
| 427 | array_name[restrict]
|
|---|
| 428 | GCC 3.1 and clang support this.
|
|---|
| 429 | This syntax is not usable in C++ mode. */
|
|---|
| 430 | #if (__GNUC_PREREQ (3,1) || __clang_major__ >= 3) && !defined __cplusplus
|
|---|
| 431 | # define __restrict_arr __restrict
|
|---|
| 432 | #else
|
|---|
| 433 | # ifdef __GNUC__
|
|---|
| 434 | # define __restrict_arr /* Not supported in old GCC. */
|
|---|
| 435 | # else
|
|---|
| 436 | # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
|
|---|
| 437 | # define __restrict_arr restrict
|
|---|
| 438 | # else
|
|---|
| 439 | /* Some other non-C99 compiler. */
|
|---|
| 440 | # define __restrict_arr /* Not supported. */
|
|---|
| 441 | # endif
|
|---|
| 442 | # endif
|
|---|
| 443 | #endif
|
|---|
| 444 |
|
|---|
| 445 | #if (__GNUC__ >= 3) || __glibc_has_builtin (__builtin_expect)
|
|---|
| 446 | # define __glibc_unlikely(cond) __builtin_expect ((cond), 0)
|
|---|
| 447 | # define __glibc_likely(cond) __builtin_expect ((cond), 1)
|
|---|
| 448 | #else
|
|---|
| 449 | # define __glibc_unlikely(cond) (cond)
|
|---|
| 450 | # define __glibc_likely(cond) (cond)
|
|---|
| 451 | #endif
|
|---|
| 452 |
|
|---|
| 453 | #if (!defined _Noreturn \
|
|---|
| 454 | && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \
|
|---|
| 455 | && !(__GNUC_PREREQ (4,7) \
|
|---|
| 456 | || (3 < __clang_major__ + (5 <= __clang_minor__))))
|
|---|
| 457 | # if __GNUC_PREREQ (2,8)
|
|---|
| 458 | # define _Noreturn __attribute__ ((__noreturn__))
|
|---|
| 459 | # else
|
|---|
| 460 | # define _Noreturn
|
|---|
| 461 | # endif
|
|---|
| 462 | #endif
|
|---|
| 463 |
|
|---|
| 464 | #if __GNUC_PREREQ (8, 0)
|
|---|
| 465 | /* Describes a char array whose address can safely be passed as the first
|
|---|
| 466 | argument to strncpy and strncat, as the char array is not necessarily
|
|---|
| 467 | a NUL-terminated string. */
|
|---|
| 468 | # define __attribute_nonstring__ __attribute__ ((__nonstring__))
|
|---|
| 469 | #else
|
|---|
| 470 | # define __attribute_nonstring__
|
|---|
| 471 | #endif
|
|---|
| 472 |
|
|---|
| 473 | /* Undefine (also defined in libc-symbols.h). */
|
|---|
| 474 | #undef __attribute_copy__
|
|---|
| 475 | #if __GNUC_PREREQ (9, 0)
|
|---|
| 476 | /* Copies attributes from the declaration or type referenced by
|
|---|
| 477 | the argument. */
|
|---|
| 478 | # define __attribute_copy__(arg) __attribute__ ((__copy__ (arg)))
|
|---|
| 479 | #else
|
|---|
| 480 | # define __attribute_copy__(arg)
|
|---|
| 481 | #endif
|
|---|
| 482 |
|
|---|
| 483 | #if (!defined _Static_assert && !defined __cplusplus \
|
|---|
| 484 | && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \
|
|---|
| 485 | && (!(__GNUC_PREREQ (4, 6) || __clang_major__ >= 4) \
|
|---|
| 486 | || defined __STRICT_ANSI__))
|
|---|
| 487 | # define _Static_assert(expr, diagnostic) \
|
|---|
| 488 | extern int (*__Static_assert_function (void)) \
|
|---|
| 489 | [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })]
|
|---|
| 490 | #endif
|
|---|
| 491 |
|
|---|
| 492 | /* Gnulib avoids including these, as they don't work on non-glibc or
|
|---|
| 493 | older glibc platforms. */
|
|---|
| 494 | #ifndef __GNULIB_CDEFS
|
|---|
| 495 | # include <bits/wordsize.h>
|
|---|
| 496 | # include <bits/long-double.h>
|
|---|
| 497 | #endif
|
|---|
| 498 |
|
|---|
| 499 | #if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
|
|---|
| 500 | # ifdef __REDIRECT
|
|---|
| 501 |
|
|---|
| 502 | /* Alias name defined automatically. */
|
|---|
| 503 | # define __LDBL_REDIR(name, proto) ... unused__ldbl_redir
|
|---|
| 504 | # define __LDBL_REDIR_DECL(name) \
|
|---|
| 505 | extern __typeof (name) name __asm (__ASMNAME ("__" #name "ieee128"));
|
|---|
| 506 |
|
|---|
| 507 | /* Alias name defined automatically, with leading underscores. */
|
|---|
| 508 | # define __LDBL_REDIR2_DECL(name) \
|
|---|
| 509 | extern __typeof (__##name) __##name \
|
|---|
| 510 | __asm (__ASMNAME ("__" #name "ieee128"));
|
|---|
| 511 |
|
|---|
| 512 | /* Alias name defined manually. */
|
|---|
| 513 | # define __LDBL_REDIR1(name, proto, alias) ... unused__ldbl_redir1
|
|---|
| 514 | # define __LDBL_REDIR1_DECL(name, alias) \
|
|---|
| 515 | extern __typeof (name) name __asm (__ASMNAME (#alias));
|
|---|
| 516 |
|
|---|
| 517 | # define __LDBL_REDIR1_NTH(name, proto, alias) \
|
|---|
| 518 | __REDIRECT_NTH (name, proto, alias)
|
|---|
| 519 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \
|
|---|
| 520 | __LDBL_REDIR1_NTH (name, proto, __##alias##ieee128)
|
|---|
| 521 |
|
|---|
| 522 | /* Unused. */
|
|---|
| 523 | # define __REDIRECT_LDBL(name, proto, alias) ... unused__redirect_ldbl
|
|---|
| 524 | # define __LDBL_REDIR_NTH(name, proto) ... unused__ldbl_redir_nth
|
|---|
| 525 |
|
|---|
| 526 | # else
|
|---|
| 527 | _Static_assert (0, "IEEE 128-bits long double requires redirection on this platform");
|
|---|
| 528 | # endif
|
|---|
| 529 | #elif defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH
|
|---|
| 530 | # define __LDBL_COMPAT 1
|
|---|
| 531 | # ifdef __REDIRECT
|
|---|
| 532 | # define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias)
|
|---|
| 533 | # define __LDBL_REDIR(name, proto) \
|
|---|
| 534 | __LDBL_REDIR1 (name, proto, __nldbl_##name)
|
|---|
| 535 | # define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias)
|
|---|
| 536 | # define __LDBL_REDIR_NTH(name, proto) \
|
|---|
| 537 | __LDBL_REDIR1_NTH (name, proto, __nldbl_##name)
|
|---|
| 538 | # define __LDBL_REDIR2_DECL(name) \
|
|---|
| 539 | extern __typeof (__##name) __##name __asm (__ASMNAME ("__nldbl___" #name));
|
|---|
| 540 | # define __LDBL_REDIR1_DECL(name, alias) \
|
|---|
| 541 | extern __typeof (name) name __asm (__ASMNAME (#alias));
|
|---|
| 542 | # define __LDBL_REDIR_DECL(name) \
|
|---|
| 543 | extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name));
|
|---|
| 544 | # define __REDIRECT_LDBL(name, proto, alias) \
|
|---|
| 545 | __LDBL_REDIR1 (name, proto, __nldbl_##alias)
|
|---|
| 546 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \
|
|---|
| 547 | __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias)
|
|---|
| 548 | # endif
|
|---|
| 549 | #endif
|
|---|
| 550 | #if (!defined __LDBL_COMPAT && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 0) \
|
|---|
| 551 | || !defined __REDIRECT
|
|---|
| 552 | # define __LDBL_REDIR1(name, proto, alias) name proto
|
|---|
| 553 | # define __LDBL_REDIR(name, proto) name proto
|
|---|
| 554 | # define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW
|
|---|
| 555 | # define __LDBL_REDIR_NTH(name, proto) name proto __THROW
|
|---|
| 556 | # define __LDBL_REDIR2_DECL(name)
|
|---|
| 557 | # define __LDBL_REDIR_DECL(name)
|
|---|
| 558 | # ifdef __REDIRECT
|
|---|
| 559 | # define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias)
|
|---|
| 560 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \
|
|---|
| 561 | __REDIRECT_NTH (name, proto, alias)
|
|---|
| 562 | # endif
|
|---|
| 563 | #endif
|
|---|
| 564 |
|
|---|
| 565 | /* __glibc_macro_warning (MESSAGE) issues warning MESSAGE. This is
|
|---|
| 566 | intended for use in preprocessor macros.
|
|---|
| 567 |
|
|---|
| 568 | Note: MESSAGE must be a _single_ string; concatenation of string
|
|---|
| 569 | literals is not supported. */
|
|---|
| 570 | #if __GNUC_PREREQ (4,8) || __glibc_clang_prereq (3,5)
|
|---|
| 571 | # define __glibc_macro_warning1(message) _Pragma (#message)
|
|---|
| 572 | # define __glibc_macro_warning(message) \
|
|---|
| 573 | __glibc_macro_warning1 (GCC warning message)
|
|---|
| 574 | #else
|
|---|
| 575 | # define __glibc_macro_warning(msg)
|
|---|
| 576 | #endif
|
|---|
| 577 |
|
|---|
| 578 | /* Generic selection (ISO C11) is a C-only feature, available in GCC
|
|---|
| 579 | since version 4.9. Previous versions do not provide generic
|
|---|
| 580 | selection, even though they might set __STDC_VERSION__ to 201112L,
|
|---|
| 581 | when in -std=c11 mode. Thus, we must check for !defined __GNUC__
|
|---|
| 582 | when testing __STDC_VERSION__ for generic selection support.
|
|---|
| 583 | On the other hand, Clang also defines __GNUC__, so a clang-specific
|
|---|
| 584 | check is required to enable the use of generic selection. */
|
|---|
| 585 | #if !defined __cplusplus \
|
|---|
| 586 | && (__GNUC_PREREQ (4, 9) \
|
|---|
| 587 | || __glibc_has_extension (c_generic_selections) \
|
|---|
| 588 | || (!defined __GNUC__ && defined __STDC_VERSION__ \
|
|---|
| 589 | && __STDC_VERSION__ >= 201112L))
|
|---|
| 590 | # define __HAVE_GENERIC_SELECTION 1
|
|---|
| 591 | #else
|
|---|
| 592 | # define __HAVE_GENERIC_SELECTION 0
|
|---|
| 593 | #endif
|
|---|
| 594 |
|
|---|
| 595 | #if __GNUC_PREREQ (10, 0)
|
|---|
| 596 | /* Designates a 1-based positional argument ref-index of pointer type
|
|---|
| 597 | that can be used to access size-index elements of the pointed-to
|
|---|
| 598 | array according to access mode, or at least one element when
|
|---|
| 599 | size-index is not provided:
|
|---|
| 600 | access (access-mode, <ref-index> [, <size-index>]) */
|
|---|
| 601 | #define __attr_access(x) __attribute__ ((__access__ x))
|
|---|
| 602 | #else
|
|---|
| 603 | # define __attr_access(x)
|
|---|
| 604 | #endif
|
|---|
| 605 |
|
|---|
| 606 | /* Specify that a function such as setjmp or vfork may return
|
|---|
| 607 | twice. */
|
|---|
| 608 | #if __GNUC_PREREQ (4, 1)
|
|---|
| 609 | # define __attribute_returns_twice__ __attribute__ ((__returns_twice__))
|
|---|
| 610 | #else
|
|---|
| 611 | # define __attribute_returns_twice__ /* Ignore. */
|
|---|
| 612 | #endif
|
|---|
| 613 |
|
|---|
| 614 | #endif /* sys/cdefs.h */
|
|---|
