| 1 | /* Copyright (C) 1992-2022 Free Software Foundation, Inc.
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| 2 | Copyright The GNU Toolchain Authors.
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| 3 | This file is part of the GNU C Library.
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| 4 |
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| 5 | The GNU C Library is free software; you can redistribute it and/or
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| 6 | modify it under the terms of the GNU Lesser General Public
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| 7 | License as published by the Free Software Foundation; either
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| 8 | version 2.1 of the License, or (at your option) any later version.
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| 9 |
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| 10 | The GNU C Library is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | Lesser General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU Lesser General Public
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| 16 | License along with the GNU C Library; if not, see
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| 17 | <https://www.gnu.org/licenses/>. */
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| 18 |
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| 19 | #ifndef _SYS_CDEFS_H
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| 20 | #define _SYS_CDEFS_H 1
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| 21 |
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| 22 | /* We are almost always included from features.h. */
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| 23 | #ifndef _FEATURES_H
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| 24 | # include <features.h>
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| 25 | #endif
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| 26 |
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| 27 | /* The GNU libc does not support any K&R compilers or the traditional mode
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| 28 | of ISO C compilers anymore. Check for some of the combinations not
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| 29 | supported anymore. */
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| 30 | #if defined __GNUC__ && !defined __STDC__
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| 31 | # error "You need a ISO C conforming compiler to use the glibc headers"
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| 32 | #endif
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| 33 |
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| 34 | /* Some user header file might have defined this before. */
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| 35 | #undef __P
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| 36 | #undef __PMT
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| 37 |
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| 38 | /* Compilers that lack __has_attribute may object to
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| 39 | #if defined __has_attribute && __has_attribute (...)
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| 40 | even though they do not need to evaluate the right-hand side of the &&.
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| 41 | Similarly for __has_builtin, etc. */
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| 42 | #if (defined __has_attribute \
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| 43 | && (!defined __clang_minor__ \
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| 44 | || (defined __apple_build_version__ \
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| 45 | ? 6000000 <= __apple_build_version__ \
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| 46 | : 3 < __clang_major__ + (5 <= __clang_minor__))))
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| 47 | # define __glibc_has_attribute(attr) __has_attribute (attr)
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| 48 | #else
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| 49 | # define __glibc_has_attribute(attr) 0
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| 50 | #endif
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| 51 | #ifdef __has_builtin
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| 52 | # define __glibc_has_builtin(name) __has_builtin (name)
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| 53 | #else
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| 54 | # define __glibc_has_builtin(name) 0
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| 55 | #endif
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| 56 | #ifdef __has_extension
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| 57 | # define __glibc_has_extension(ext) __has_extension (ext)
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| 58 | #else
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| 59 | # define __glibc_has_extension(ext) 0
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| 60 | #endif
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| 61 |
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| 62 | #if defined __GNUC__ || defined __clang__
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| 63 |
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| 64 | /* All functions, except those with callbacks or those that
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| 65 | synchronize memory, are leaf functions. */
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| 66 | # if __GNUC_PREREQ (4, 6) && !defined _LIBC
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| 67 | # define __LEAF , __leaf__
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| 68 | # define __LEAF_ATTR __attribute__ ((__leaf__))
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| 69 | # else
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| 70 | # define __LEAF
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| 71 | # define __LEAF_ATTR
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| 72 | # endif
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| 73 |
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| 74 | /* GCC can always grok prototypes. For C++ programs we add throw()
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| 75 | to help it optimize the function calls. But this only works with
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| 76 | gcc 2.8.x and egcs. For gcc 3.4 and up we even mark C functions
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| 77 | as non-throwing using a function attribute since programs can use
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| 78 | the -fexceptions options for C code as well. */
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| 79 | # if !defined __cplusplus \
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| 80 | && (__GNUC_PREREQ (3, 4) || __glibc_has_attribute (__nothrow__))
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| 81 | # define __THROW __attribute__ ((__nothrow__ __LEAF))
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| 82 | # define __THROWNL __attribute__ ((__nothrow__))
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| 83 | # define __NTH(fct) __attribute__ ((__nothrow__ __LEAF)) fct
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| 84 | # define __NTHNL(fct) __attribute__ ((__nothrow__)) fct
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| 85 | # else
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| 86 | # if defined __cplusplus && (__GNUC_PREREQ (2,8) || __clang_major >= 4)
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| 87 | # if __cplusplus >= 201103L
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| 88 | # define __THROW noexcept (true)
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| 89 | # else
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| 90 | # define __THROW throw ()
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| 91 | # endif
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| 92 | # define __THROWNL __THROW
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| 93 | # define __NTH(fct) __LEAF_ATTR fct __THROW
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| 94 | # define __NTHNL(fct) fct __THROW
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| 95 | # else
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| 96 | # define __THROW
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| 97 | # define __THROWNL
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| 98 | # define __NTH(fct) fct
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| 99 | # define __NTHNL(fct) fct
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| 100 | # endif
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| 101 | # endif
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| 102 |
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| 103 | #else /* Not GCC or clang. */
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| 104 |
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| 105 | # if (defined __cplusplus \
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| 106 | || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
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| 107 | # define __inline inline
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| 108 | # else
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| 109 | # define __inline /* No inline functions. */
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| 110 | # endif
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| 111 |
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| 112 | # define __THROW
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| 113 | # define __THROWNL
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| 114 | # define __NTH(fct) fct
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| 115 |
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| 116 | #endif /* GCC || clang. */
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| 117 |
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| 118 | /* These two macros are not used in glibc anymore. They are kept here
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| 119 | only because some other projects expect the macros to be defined. */
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| 120 | #define __P(args) args
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| 121 | #define __PMT(args) args
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| 122 |
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| 123 | /* For these things, GCC behaves the ANSI way normally,
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| 124 | and the non-ANSI way under -traditional. */
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| 125 |
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| 126 | #define __CONCAT(x,y) x ## y
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| 127 | #define __STRING(x) #x
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| 128 |
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| 129 | /* This is not a typedef so `const __ptr_t' does the right thing. */
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| 130 | #define __ptr_t void *
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| 131 |
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| 132 |
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| 133 | /* C++ needs to know that types and declarations are C, not C++. */
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| 134 | #ifdef __cplusplus
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| 135 | # define __BEGIN_DECLS extern "C" {
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| 136 | # define __END_DECLS }
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| 137 | #else
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| 138 | # define __BEGIN_DECLS
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| 139 | # define __END_DECLS
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| 140 | #endif
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| 141 |
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| 142 |
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| 143 | /* Fortify support. */
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| 144 | #define __bos(ptr) __builtin_object_size (ptr, __USE_FORTIFY_LEVEL > 1)
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| 145 | #define __bos0(ptr) __builtin_object_size (ptr, 0)
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| 146 |
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| 147 | /* Use __builtin_dynamic_object_size at _FORTIFY_SOURCE=3 when available. */
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| 148 | #if __USE_FORTIFY_LEVEL == 3 && (__glibc_clang_prereq (9, 0) \
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| 149 | || __GNUC_PREREQ (12, 0))
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| 150 | # define __glibc_objsize0(__o) __builtin_dynamic_object_size (__o, 0)
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| 151 | # define __glibc_objsize(__o) __builtin_dynamic_object_size (__o, 1)
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| 152 | #else
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| 153 | # define __glibc_objsize0(__o) __bos0 (__o)
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| 154 | # define __glibc_objsize(__o) __bos (__o)
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| 155 | #endif
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| 156 |
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| 157 | /* Compile time conditions to choose between the regular, _chk and _chk_warn
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| 158 | variants. These conditions should get evaluated to constant and optimized
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| 159 | away. */
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| 160 |
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| 161 | #define __glibc_safe_len_cond(__l, __s, __osz) ((__l) <= (__osz) / (__s))
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| 162 | #define __glibc_unsigned_or_positive(__l) \
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| 163 | ((__typeof (__l)) 0 < (__typeof (__l)) -1 \
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| 164 | || (__builtin_constant_p (__l) && (__l) > 0))
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| 165 |
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| 166 | /* Length is known to be safe at compile time if the __L * __S <= __OBJSZ
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| 167 | condition can be folded to a constant and if it is true, or unknown (-1) */
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| 168 | #define __glibc_safe_or_unknown_len(__l, __s, __osz) \
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| 169 | ((__osz) == (__SIZE_TYPE__) -1 \
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| 170 | || (__glibc_unsigned_or_positive (__l) \
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| 171 | && __builtin_constant_p (__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), \
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| 172 | (__s), (__osz))) \
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| 173 | && __glibc_safe_len_cond ((__SIZE_TYPE__) (__l), (__s), (__osz))))
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| 174 |
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| 175 | /* Conversely, we know at compile time that the length is unsafe if the
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| 176 | __L * __S <= __OBJSZ condition can be folded to a constant and if it is
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| 177 | false. */
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| 178 | #define __glibc_unsafe_len(__l, __s, __osz) \
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| 179 | (__glibc_unsigned_or_positive (__l) \
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| 180 | && __builtin_constant_p (__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), \
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| 181 | __s, __osz)) \
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| 182 | && !__glibc_safe_len_cond ((__SIZE_TYPE__) (__l), __s, __osz))
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| 183 |
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| 184 | /* Fortify function f. __f_alias, __f_chk and __f_chk_warn must be
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| 185 | declared. */
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| 186 |
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| 187 | #define __glibc_fortify(f, __l, __s, __osz, ...) \
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| 188 | (__glibc_safe_or_unknown_len (__l, __s, __osz) \
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| 189 | ? __ ## f ## _alias (__VA_ARGS__) \
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| 190 | : (__glibc_unsafe_len (__l, __s, __osz) \
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| 191 | ? __ ## f ## _chk_warn (__VA_ARGS__, __osz) \
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| 192 | : __ ## f ## _chk (__VA_ARGS__, __osz))) \
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| 193 |
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| 194 | /* Fortify function f, where object size argument passed to f is the number of
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| 195 | elements and not total size. */
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| 196 |
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| 197 | #define __glibc_fortify_n(f, __l, __s, __osz, ...) \
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| 198 | (__glibc_safe_or_unknown_len (__l, __s, __osz) \
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| 199 | ? __ ## f ## _alias (__VA_ARGS__) \
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| 200 | : (__glibc_unsafe_len (__l, __s, __osz) \
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| 201 | ? __ ## f ## _chk_warn (__VA_ARGS__, (__osz) / (__s)) \
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| 202 | : __ ## f ## _chk (__VA_ARGS__, (__osz) / (__s)))) \
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| 203 |
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| 204 | #if __GNUC_PREREQ (4,3)
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| 205 | # define __warnattr(msg) __attribute__((__warning__ (msg)))
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| 206 | # define __errordecl(name, msg) \
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| 207 | extern void name (void) __attribute__((__error__ (msg)))
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| 208 | #else
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| 209 | # define __warnattr(msg)
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| 210 | # define __errordecl(name, msg) extern void name (void)
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| 211 | #endif
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| 212 |
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| 213 | /* Support for flexible arrays.
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| 214 | Headers that should use flexible arrays only if they're "real"
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| 215 | (e.g. only if they won't affect sizeof()) should test
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| 216 | #if __glibc_c99_flexarr_available. */
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| 217 | #if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L && !defined __HP_cc
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| 218 | # define __flexarr []
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| 219 | # define __glibc_c99_flexarr_available 1
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| 220 | #elif __GNUC_PREREQ (2,97) || defined __clang__
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| 221 | /* GCC 2.97 and clang support C99 flexible array members as an extension,
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| 222 | even when in C89 mode or compiling C++ (any version). */
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| 223 | # define __flexarr []
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| 224 | # define __glibc_c99_flexarr_available 1
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| 225 | #elif defined __GNUC__
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| 226 | /* Pre-2.97 GCC did not support C99 flexible arrays but did have
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| 227 | an equivalent extension with slightly different notation. */
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| 228 | # define __flexarr [0]
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| 229 | # define __glibc_c99_flexarr_available 1
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| 230 | #else
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| 231 | /* Some other non-C99 compiler. Approximate with [1]. */
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| 232 | # define __flexarr [1]
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| 233 | # define __glibc_c99_flexarr_available 0
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| 234 | #endif
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| 235 |
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| 236 |
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| 237 | /* __asm__ ("xyz") is used throughout the headers to rename functions
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| 238 | at the assembly language level. This is wrapped by the __REDIRECT
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| 239 | macro, in order to support compilers that can do this some other
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| 240 | way. When compilers don't support asm-names at all, we have to do
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| 241 | preprocessor tricks instead (which don't have exactly the right
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| 242 | semantics, but it's the best we can do).
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| 243 |
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| 244 | Example:
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| 245 | int __REDIRECT(setpgrp, (__pid_t pid, __pid_t pgrp), setpgid); */
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| 246 |
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| 247 | #if (defined __GNUC__ && __GNUC__ >= 2) || (__clang_major__ >= 4)
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| 248 |
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| 249 | # define __REDIRECT(name, proto, alias) name proto __asm__ (__ASMNAME (#alias))
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| 250 | # ifdef __cplusplus
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| 251 | # define __REDIRECT_NTH(name, proto, alias) \
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| 252 | name proto __THROW __asm__ (__ASMNAME (#alias))
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| 253 | # define __REDIRECT_NTHNL(name, proto, alias) \
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| 254 | name proto __THROWNL __asm__ (__ASMNAME (#alias))
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| 255 | # else
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| 256 | # define __REDIRECT_NTH(name, proto, alias) \
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| 257 | name proto __asm__ (__ASMNAME (#alias)) __THROW
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| 258 | # define __REDIRECT_NTHNL(name, proto, alias) \
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| 259 | name proto __asm__ (__ASMNAME (#alias)) __THROWNL
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| 260 | # endif
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| 261 | # define __ASMNAME(cname) __ASMNAME2 (__USER_LABEL_PREFIX__, cname)
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| 262 | # define __ASMNAME2(prefix, cname) __STRING (prefix) cname
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| 263 |
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| 264 | /*
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| 265 | #elif __SOME_OTHER_COMPILER__
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| 266 |
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| 267 | # define __REDIRECT(name, proto, alias) name proto; \
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| 268 | _Pragma("let " #name " = " #alias)
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| 269 | */
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| 270 | #endif
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| 271 |
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| 272 | /* GCC and clang have various useful declarations that can be made with
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| 273 | the '__attribute__' syntax. All of the ways we use this do fine if
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| 274 | they are omitted for compilers that don't understand it. */
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| 275 | #if !(defined __GNUC__ || defined __clang__)
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| 276 | # define __attribute__(xyz) /* Ignore */
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| 277 | #endif
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| 278 |
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| 279 | /* At some point during the gcc 2.96 development the `malloc' attribute
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| 280 | for functions was introduced. We don't want to use it unconditionally
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| 281 | (although this would be possible) since it generates warnings. */
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| 282 | #if __GNUC_PREREQ (2,96) || __glibc_has_attribute (__malloc__)
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| 283 | # define __attribute_malloc__ __attribute__ ((__malloc__))
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| 284 | #else
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| 285 | # define __attribute_malloc__ /* Ignore */
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| 286 | #endif
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| 287 |
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| 288 | /* Tell the compiler which arguments to an allocation function
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| 289 | indicate the size of the allocation. */
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| 290 | #if __GNUC_PREREQ (4, 3)
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| 291 | # define __attribute_alloc_size__(params) \
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| 292 | __attribute__ ((__alloc_size__ params))
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| 293 | #else
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| 294 | # define __attribute_alloc_size__(params) /* Ignore. */
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| 295 | #endif
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| 296 |
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| 297 | /* Tell the compiler which argument to an allocation function
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| 298 | indicates the alignment of the allocation. */
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| 299 | #if __GNUC_PREREQ (4, 9) || __glibc_has_attribute (__alloc_align__)
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| 300 | # define __attribute_alloc_align__(param) \
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| 301 | __attribute__ ((__alloc_align__ param))
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| 302 | #else
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| 303 | # define __attribute_alloc_align__(param) /* Ignore. */
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| 304 | #endif
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| 305 |
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| 306 | /* At some point during the gcc 2.96 development the `pure' attribute
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| 307 | for functions was introduced. We don't want to use it unconditionally
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| 308 | (although this would be possible) since it generates warnings. */
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| 309 | #if __GNUC_PREREQ (2,96) || __glibc_has_attribute (__pure__)
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| 310 | # define __attribute_pure__ __attribute__ ((__pure__))
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| 311 | #else
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| 312 | # define __attribute_pure__ /* Ignore */
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| 313 | #endif
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| 314 |
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| 315 | /* This declaration tells the compiler that the value is constant. */
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| 316 | #if __GNUC_PREREQ (2,5) || __glibc_has_attribute (__const__)
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| 317 | # define __attribute_const__ __attribute__ ((__const__))
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| 318 | #else
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| 319 | # define __attribute_const__ /* Ignore */
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| 320 | #endif
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| 321 |
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| 322 | #if __GNUC_PREREQ (2,7) || __glibc_has_attribute (__unused__)
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| 323 | # define __attribute_maybe_unused__ __attribute__ ((__unused__))
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| 324 | #else
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| 325 | # define __attribute_maybe_unused__ /* Ignore */
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| 326 | #endif
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| 327 |
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| 328 | /* At some point during the gcc 3.1 development the `used' attribute
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| 329 | for functions was introduced. We don't want to use it unconditionally
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| 330 | (although this would be possible) since it generates warnings. */
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| 331 | #if __GNUC_PREREQ (3,1) || __glibc_has_attribute (__used__)
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| 332 | # define __attribute_used__ __attribute__ ((__used__))
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| 333 | # define __attribute_noinline__ __attribute__ ((__noinline__))
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| 334 | #else
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| 335 | # define __attribute_used__ __attribute__ ((__unused__))
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| 336 | # define __attribute_noinline__ /* Ignore */
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| 337 | #endif
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| 338 |
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| 339 | /* Since version 3.2, gcc allows marking deprecated functions. */
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| 340 | #if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__deprecated__)
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| 341 | # define __attribute_deprecated__ __attribute__ ((__deprecated__))
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| 342 | #else
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| 343 | # define __attribute_deprecated__ /* Ignore */
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| 344 | #endif
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| 345 |
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| 346 | /* Since version 4.5, gcc also allows one to specify the message printed
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| 347 | when a deprecated function is used. clang claims to be gcc 4.2, but
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| 348 | may also support this feature. */
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| 349 | #if __GNUC_PREREQ (4,5) \
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| 350 | || __glibc_has_extension (__attribute_deprecated_with_message__)
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| 351 | # define __attribute_deprecated_msg__(msg) \
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| 352 | __attribute__ ((__deprecated__ (msg)))
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| 353 | #else
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| 354 | # define __attribute_deprecated_msg__(msg) __attribute_deprecated__
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| 355 | #endif
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| 356 |
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| 357 | /* At some point during the gcc 2.8 development the `format_arg' attribute
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| 358 | for functions was introduced. We don't want to use it unconditionally
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| 359 | (although this would be possible) since it generates warnings.
|
|---|
| 360 | If several `format_arg' attributes are given for the same function, in
|
|---|
| 361 | gcc-3.0 and older, all but the last one are ignored. In newer gccs,
|
|---|
| 362 | all designated arguments are considered. */
|
|---|
| 363 | #if __GNUC_PREREQ (2,8) || __glibc_has_attribute (__format_arg__)
|
|---|
| 364 | # define __attribute_format_arg__(x) __attribute__ ((__format_arg__ (x)))
|
|---|
| 365 | #else
|
|---|
| 366 | # define __attribute_format_arg__(x) /* Ignore */
|
|---|
| 367 | #endif
|
|---|
| 368 |
|
|---|
| 369 | /* At some point during the gcc 2.97 development the `strfmon' format
|
|---|
| 370 | attribute for functions was introduced. We don't want to use it
|
|---|
| 371 | unconditionally (although this would be possible) since it
|
|---|
| 372 | generates warnings. */
|
|---|
| 373 | #if __GNUC_PREREQ (2,97) || __glibc_has_attribute (__format__)
|
|---|
| 374 | # define __attribute_format_strfmon__(a,b) \
|
|---|
| 375 | __attribute__ ((__format__ (__strfmon__, a, b)))
|
|---|
| 376 | #else
|
|---|
| 377 | # define __attribute_format_strfmon__(a,b) /* Ignore */
|
|---|
| 378 | #endif
|
|---|
| 379 |
|
|---|
| 380 | /* The nonnull function attribute marks pointer parameters that
|
|---|
| 381 | must not be NULL. This has the name __nonnull in glibc,
|
|---|
| 382 | and __attribute_nonnull__ in files shared with Gnulib to avoid
|
|---|
| 383 | collision with a different __nonnull in DragonFlyBSD 5.9. */
|
|---|
| 384 | #ifndef __attribute_nonnull__
|
|---|
| 385 | # if __GNUC_PREREQ (3,3) || __glibc_has_attribute (__nonnull__)
|
|---|
| 386 | # define __attribute_nonnull__(params) __attribute__ ((__nonnull__ params))
|
|---|
| 387 | # else
|
|---|
| 388 | # define __attribute_nonnull__(params)
|
|---|
| 389 | # endif
|
|---|
| 390 | #endif
|
|---|
| 391 | #ifndef __nonnull
|
|---|
| 392 | # define __nonnull(params) __attribute_nonnull__ (params)
|
|---|
| 393 | #endif
|
|---|
| 394 |
|
|---|
| 395 | /* The returns_nonnull function attribute marks the return type of the function
|
|---|
| 396 | as always being non-null. */
|
|---|
| 397 | #ifndef __returns_nonnull
|
|---|
| 398 | # if __GNUC_PREREQ (4, 9) || __glibc_has_attribute (__returns_nonnull__)
|
|---|
| 399 | # define __returns_nonnull __attribute__ ((__returns_nonnull__))
|
|---|
| 400 | # else
|
|---|
| 401 | # define __returns_nonnull
|
|---|
| 402 | # endif
|
|---|
| 403 | #endif
|
|---|
| 404 |
|
|---|
| 405 | /* If fortification mode, we warn about unused results of certain
|
|---|
| 406 | function calls which can lead to problems. */
|
|---|
| 407 | #if __GNUC_PREREQ (3,4) || __glibc_has_attribute (__warn_unused_result__)
|
|---|
| 408 | # define __attribute_warn_unused_result__ \
|
|---|
| 409 | __attribute__ ((__warn_unused_result__))
|
|---|
| 410 | # if defined __USE_FORTIFY_LEVEL && __USE_FORTIFY_LEVEL > 0
|
|---|
| 411 | # define __wur __attribute_warn_unused_result__
|
|---|
| 412 | # endif
|
|---|
| 413 | #else
|
|---|
| 414 | # define __attribute_warn_unused_result__ /* empty */
|
|---|
| 415 | #endif
|
|---|
| 416 | #ifndef __wur
|
|---|
| 417 | # define __wur /* Ignore */
|
|---|
| 418 | #endif
|
|---|
| 419 |
|
|---|
| 420 | /* Forces a function to be always inlined. */
|
|---|
| 421 | #if __GNUC_PREREQ (3,2) || __glibc_has_attribute (__always_inline__)
|
|---|
| 422 | /* The Linux kernel defines __always_inline in stddef.h (283d7573), and
|
|---|
| 423 | it conflicts with this definition. Therefore undefine it first to
|
|---|
| 424 | allow either header to be included first. */
|
|---|
| 425 | # undef __always_inline
|
|---|
| 426 | # define __always_inline __inline __attribute__ ((__always_inline__))
|
|---|
| 427 | #else
|
|---|
| 428 | # undef __always_inline
|
|---|
| 429 | # define __always_inline __inline
|
|---|
| 430 | #endif
|
|---|
| 431 |
|
|---|
| 432 | /* Associate error messages with the source location of the call site rather
|
|---|
| 433 | than with the source location inside the function. */
|
|---|
| 434 | #if __GNUC_PREREQ (4,3) || __glibc_has_attribute (__artificial__)
|
|---|
| 435 | # define __attribute_artificial__ __attribute__ ((__artificial__))
|
|---|
| 436 | #else
|
|---|
| 437 | # define __attribute_artificial__ /* Ignore */
|
|---|
| 438 | #endif
|
|---|
| 439 |
|
|---|
| 440 | /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
|
|---|
| 441 | inline semantics, unless -fgnu89-inline is used. Using __GNUC_STDC_INLINE__
|
|---|
| 442 | or __GNUC_GNU_INLINE is not a good enough check for gcc because gcc versions
|
|---|
| 443 | older than 4.3 may define these macros and still not guarantee GNU inlining
|
|---|
| 444 | semantics.
|
|---|
| 445 |
|
|---|
| 446 | clang++ identifies itself as gcc-4.2, but has support for GNU inlining
|
|---|
| 447 | semantics, that can be checked for by using the __GNUC_STDC_INLINE_ and
|
|---|
| 448 | __GNUC_GNU_INLINE__ macro definitions. */
|
|---|
| 449 | #if (!defined __cplusplus || __GNUC_PREREQ (4,3) \
|
|---|
| 450 | || (defined __clang__ && (defined __GNUC_STDC_INLINE__ \
|
|---|
| 451 | || defined __GNUC_GNU_INLINE__)))
|
|---|
| 452 | # if defined __GNUC_STDC_INLINE__ || defined __cplusplus
|
|---|
| 453 | # define __extern_inline extern __inline __attribute__ ((__gnu_inline__))
|
|---|
| 454 | # define __extern_always_inline \
|
|---|
| 455 | extern __always_inline __attribute__ ((__gnu_inline__))
|
|---|
| 456 | # else
|
|---|
| 457 | # define __extern_inline extern __inline
|
|---|
| 458 | # define __extern_always_inline extern __always_inline
|
|---|
| 459 | # endif
|
|---|
| 460 | #endif
|
|---|
| 461 |
|
|---|
| 462 | #ifdef __extern_always_inline
|
|---|
| 463 | # define __fortify_function __extern_always_inline __attribute_artificial__
|
|---|
| 464 | #endif
|
|---|
| 465 |
|
|---|
| 466 | /* GCC 4.3 and above allow passing all anonymous arguments of an
|
|---|
| 467 | __extern_always_inline function to some other vararg function. */
|
|---|
| 468 | #if __GNUC_PREREQ (4,3)
|
|---|
| 469 | # define __va_arg_pack() __builtin_va_arg_pack ()
|
|---|
| 470 | # define __va_arg_pack_len() __builtin_va_arg_pack_len ()
|
|---|
| 471 | #endif
|
|---|
| 472 |
|
|---|
| 473 | /* It is possible to compile containing GCC extensions even if GCC is
|
|---|
| 474 | run in pedantic mode if the uses are carefully marked using the
|
|---|
| 475 | `__extension__' keyword. But this is not generally available before
|
|---|
| 476 | version 2.8. */
|
|---|
| 477 | #if !(__GNUC_PREREQ (2,8) || defined __clang__)
|
|---|
| 478 | # define __extension__ /* Ignore */
|
|---|
| 479 | #endif
|
|---|
| 480 |
|
|---|
| 481 | /* __restrict is known in EGCS 1.2 and above, and in clang.
|
|---|
| 482 | It works also in C++ mode (outside of arrays), but only when spelled
|
|---|
| 483 | as '__restrict', not 'restrict'. */
|
|---|
| 484 | #if !(__GNUC_PREREQ (2,92) || __clang_major__ >= 3)
|
|---|
| 485 | # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
|
|---|
| 486 | # define __restrict restrict
|
|---|
| 487 | # else
|
|---|
| 488 | # define __restrict /* Ignore */
|
|---|
| 489 | # endif
|
|---|
| 490 | #endif
|
|---|
| 491 |
|
|---|
| 492 | /* ISO C99 also allows to declare arrays as non-overlapping. The syntax is
|
|---|
| 493 | array_name[restrict]
|
|---|
| 494 | GCC 3.1 and clang support this.
|
|---|
| 495 | This syntax is not usable in C++ mode. */
|
|---|
| 496 | #if (__GNUC_PREREQ (3,1) || __clang_major__ >= 3) && !defined __cplusplus
|
|---|
| 497 | # define __restrict_arr __restrict
|
|---|
| 498 | #else
|
|---|
| 499 | # ifdef __GNUC__
|
|---|
| 500 | # define __restrict_arr /* Not supported in old GCC. */
|
|---|
| 501 | # else
|
|---|
| 502 | # if defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
|
|---|
| 503 | # define __restrict_arr restrict
|
|---|
| 504 | # else
|
|---|
| 505 | /* Some other non-C99 compiler. */
|
|---|
| 506 | # define __restrict_arr /* Not supported. */
|
|---|
| 507 | # endif
|
|---|
| 508 | # endif
|
|---|
| 509 | #endif
|
|---|
| 510 |
|
|---|
| 511 | #if (__GNUC__ >= 3) || __glibc_has_builtin (__builtin_expect)
|
|---|
| 512 | # define __glibc_unlikely(cond) __builtin_expect ((cond), 0)
|
|---|
| 513 | # define __glibc_likely(cond) __builtin_expect ((cond), 1)
|
|---|
| 514 | #else
|
|---|
| 515 | # define __glibc_unlikely(cond) (cond)
|
|---|
| 516 | # define __glibc_likely(cond) (cond)
|
|---|
| 517 | #endif
|
|---|
| 518 |
|
|---|
| 519 | #if (!defined _Noreturn \
|
|---|
| 520 | && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \
|
|---|
| 521 | && !(__GNUC_PREREQ (4,7) \
|
|---|
| 522 | || (3 < __clang_major__ + (5 <= __clang_minor__))))
|
|---|
| 523 | # if __GNUC_PREREQ (2,8)
|
|---|
| 524 | # define _Noreturn __attribute__ ((__noreturn__))
|
|---|
| 525 | # else
|
|---|
| 526 | # define _Noreturn
|
|---|
| 527 | # endif
|
|---|
| 528 | #endif
|
|---|
| 529 |
|
|---|
| 530 | #if __GNUC_PREREQ (8, 0)
|
|---|
| 531 | /* Describes a char array whose address can safely be passed as the first
|
|---|
| 532 | argument to strncpy and strncat, as the char array is not necessarily
|
|---|
| 533 | a NUL-terminated string. */
|
|---|
| 534 | # define __attribute_nonstring__ __attribute__ ((__nonstring__))
|
|---|
| 535 | #else
|
|---|
| 536 | # define __attribute_nonstring__
|
|---|
| 537 | #endif
|
|---|
| 538 |
|
|---|
| 539 | /* Undefine (also defined in libc-symbols.h). */
|
|---|
| 540 | #undef __attribute_copy__
|
|---|
| 541 | #if __GNUC_PREREQ (9, 0)
|
|---|
| 542 | /* Copies attributes from the declaration or type referenced by
|
|---|
| 543 | the argument. */
|
|---|
| 544 | # define __attribute_copy__(arg) __attribute__ ((__copy__ (arg)))
|
|---|
| 545 | #else
|
|---|
| 546 | # define __attribute_copy__(arg)
|
|---|
| 547 | #endif
|
|---|
| 548 |
|
|---|
| 549 | #if (!defined _Static_assert && !defined __cplusplus \
|
|---|
| 550 | && (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) < 201112 \
|
|---|
| 551 | && (!(__GNUC_PREREQ (4, 6) || __clang_major__ >= 4) \
|
|---|
| 552 | || defined __STRICT_ANSI__))
|
|---|
| 553 | # define _Static_assert(expr, diagnostic) \
|
|---|
| 554 | extern int (*__Static_assert_function (void)) \
|
|---|
| 555 | [!!sizeof (struct { int __error_if_negative: (expr) ? 2 : -1; })]
|
|---|
| 556 | #endif
|
|---|
| 557 |
|
|---|
| 558 | /* Gnulib avoids including these, as they don't work on non-glibc or
|
|---|
| 559 | older glibc platforms. */
|
|---|
| 560 | #ifndef __GNULIB_CDEFS
|
|---|
| 561 | # include <bits/wordsize.h>
|
|---|
| 562 | # include <bits/long-double.h>
|
|---|
| 563 | #endif
|
|---|
| 564 |
|
|---|
| 565 | #if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
|
|---|
| 566 | # ifdef __REDIRECT
|
|---|
| 567 |
|
|---|
| 568 | /* Alias name defined automatically. */
|
|---|
| 569 | # define __LDBL_REDIR(name, proto) ... unused__ldbl_redir
|
|---|
| 570 | # define __LDBL_REDIR_DECL(name) \
|
|---|
| 571 | extern __typeof (name) name __asm (__ASMNAME ("__" #name "ieee128"));
|
|---|
| 572 |
|
|---|
| 573 | /* Alias name defined automatically, with leading underscores. */
|
|---|
| 574 | # define __LDBL_REDIR2_DECL(name) \
|
|---|
| 575 | extern __typeof (__##name) __##name \
|
|---|
| 576 | __asm (__ASMNAME ("__" #name "ieee128"));
|
|---|
| 577 |
|
|---|
| 578 | /* Alias name defined manually. */
|
|---|
| 579 | # define __LDBL_REDIR1(name, proto, alias) ... unused__ldbl_redir1
|
|---|
| 580 | # define __LDBL_REDIR1_DECL(name, alias) \
|
|---|
| 581 | extern __typeof (name) name __asm (__ASMNAME (#alias));
|
|---|
| 582 |
|
|---|
| 583 | # define __LDBL_REDIR1_NTH(name, proto, alias) \
|
|---|
| 584 | __REDIRECT_NTH (name, proto, alias)
|
|---|
| 585 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \
|
|---|
| 586 | __LDBL_REDIR1_NTH (name, proto, __##alias##ieee128)
|
|---|
| 587 |
|
|---|
| 588 | /* Unused. */
|
|---|
| 589 | # define __REDIRECT_LDBL(name, proto, alias) ... unused__redirect_ldbl
|
|---|
| 590 | # define __LDBL_REDIR_NTH(name, proto) ... unused__ldbl_redir_nth
|
|---|
| 591 |
|
|---|
| 592 | # else
|
|---|
| 593 | _Static_assert (0, "IEEE 128-bits long double requires redirection on this platform");
|
|---|
| 594 | # endif
|
|---|
| 595 | #elif defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH
|
|---|
| 596 | # define __LDBL_COMPAT 1
|
|---|
| 597 | # ifdef __REDIRECT
|
|---|
| 598 | # define __LDBL_REDIR1(name, proto, alias) __REDIRECT (name, proto, alias)
|
|---|
| 599 | # define __LDBL_REDIR(name, proto) \
|
|---|
| 600 | __LDBL_REDIR1 (name, proto, __nldbl_##name)
|
|---|
| 601 | # define __LDBL_REDIR1_NTH(name, proto, alias) __REDIRECT_NTH (name, proto, alias)
|
|---|
| 602 | # define __LDBL_REDIR_NTH(name, proto) \
|
|---|
| 603 | __LDBL_REDIR1_NTH (name, proto, __nldbl_##name)
|
|---|
| 604 | # define __LDBL_REDIR2_DECL(name) \
|
|---|
| 605 | extern __typeof (__##name) __##name __asm (__ASMNAME ("__nldbl___" #name));
|
|---|
| 606 | # define __LDBL_REDIR1_DECL(name, alias) \
|
|---|
| 607 | extern __typeof (name) name __asm (__ASMNAME (#alias));
|
|---|
| 608 | # define __LDBL_REDIR_DECL(name) \
|
|---|
| 609 | extern __typeof (name) name __asm (__ASMNAME ("__nldbl_" #name));
|
|---|
| 610 | # define __REDIRECT_LDBL(name, proto, alias) \
|
|---|
| 611 | __LDBL_REDIR1 (name, proto, __nldbl_##alias)
|
|---|
| 612 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \
|
|---|
| 613 | __LDBL_REDIR1_NTH (name, proto, __nldbl_##alias)
|
|---|
| 614 | # endif
|
|---|
| 615 | #endif
|
|---|
| 616 | #if (!defined __LDBL_COMPAT && __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 0) \
|
|---|
| 617 | || !defined __REDIRECT
|
|---|
| 618 | # define __LDBL_REDIR1(name, proto, alias) name proto
|
|---|
| 619 | # define __LDBL_REDIR(name, proto) name proto
|
|---|
| 620 | # define __LDBL_REDIR1_NTH(name, proto, alias) name proto __THROW
|
|---|
| 621 | # define __LDBL_REDIR_NTH(name, proto) name proto __THROW
|
|---|
| 622 | # define __LDBL_REDIR2_DECL(name)
|
|---|
| 623 | # define __LDBL_REDIR_DECL(name)
|
|---|
| 624 | # ifdef __REDIRECT
|
|---|
| 625 | # define __REDIRECT_LDBL(name, proto, alias) __REDIRECT (name, proto, alias)
|
|---|
| 626 | # define __REDIRECT_NTH_LDBL(name, proto, alias) \
|
|---|
| 627 | __REDIRECT_NTH (name, proto, alias)
|
|---|
| 628 | # endif
|
|---|
| 629 | #endif
|
|---|
| 630 |
|
|---|
| 631 | /* __glibc_macro_warning (MESSAGE) issues warning MESSAGE. This is
|
|---|
| 632 | intended for use in preprocessor macros.
|
|---|
| 633 |
|
|---|
| 634 | Note: MESSAGE must be a _single_ string; concatenation of string
|
|---|
| 635 | literals is not supported. */
|
|---|
| 636 | #if __GNUC_PREREQ (4,8) || __glibc_clang_prereq (3,5)
|
|---|
| 637 | # define __glibc_macro_warning1(message) _Pragma (#message)
|
|---|
| 638 | # define __glibc_macro_warning(message) \
|
|---|
| 639 | __glibc_macro_warning1 (GCC warning message)
|
|---|
| 640 | #else
|
|---|
| 641 | # define __glibc_macro_warning(msg)
|
|---|
| 642 | #endif
|
|---|
| 643 |
|
|---|
| 644 | /* Generic selection (ISO C11) is a C-only feature, available in GCC
|
|---|
| 645 | since version 4.9. Previous versions do not provide generic
|
|---|
| 646 | selection, even though they might set __STDC_VERSION__ to 201112L,
|
|---|
| 647 | when in -std=c11 mode. Thus, we must check for !defined __GNUC__
|
|---|
| 648 | when testing __STDC_VERSION__ for generic selection support.
|
|---|
| 649 | On the other hand, Clang also defines __GNUC__, so a clang-specific
|
|---|
| 650 | check is required to enable the use of generic selection. */
|
|---|
| 651 | #if !defined __cplusplus \
|
|---|
| 652 | && (__GNUC_PREREQ (4, 9) \
|
|---|
| 653 | || __glibc_has_extension (c_generic_selections) \
|
|---|
| 654 | || (!defined __GNUC__ && defined __STDC_VERSION__ \
|
|---|
| 655 | && __STDC_VERSION__ >= 201112L))
|
|---|
| 656 | # define __HAVE_GENERIC_SELECTION 1
|
|---|
| 657 | #else
|
|---|
| 658 | # define __HAVE_GENERIC_SELECTION 0
|
|---|
| 659 | #endif
|
|---|
| 660 |
|
|---|
| 661 | #if __GNUC_PREREQ (10, 0)
|
|---|
| 662 | /* Designates a 1-based positional argument ref-index of pointer type
|
|---|
| 663 | that can be used to access size-index elements of the pointed-to
|
|---|
| 664 | array according to access mode, or at least one element when
|
|---|
| 665 | size-index is not provided:
|
|---|
| 666 | access (access-mode, <ref-index> [, <size-index>]) */
|
|---|
| 667 | # define __attr_access(x) __attribute__ ((__access__ x))
|
|---|
| 668 | /* For _FORTIFY_SOURCE == 3 we use __builtin_dynamic_object_size, which may
|
|---|
| 669 | use the access attribute to get object sizes from function definition
|
|---|
| 670 | arguments, so we can't use them on functions we fortify. Drop the object
|
|---|
| 671 | size hints for such functions. */
|
|---|
| 672 | # if __USE_FORTIFY_LEVEL == 3
|
|---|
| 673 | # define __fortified_attr_access(a, o, s) __attribute__ ((__access__ (a, o)))
|
|---|
| 674 | # else
|
|---|
| 675 | # define __fortified_attr_access(a, o, s) __attr_access ((a, o, s))
|
|---|
| 676 | # endif
|
|---|
| 677 | # if __GNUC_PREREQ (11, 0)
|
|---|
| 678 | # define __attr_access_none(argno) __attribute__ ((__access__ (__none__, argno)))
|
|---|
| 679 | # else
|
|---|
| 680 | # define __attr_access_none(argno)
|
|---|
| 681 | # endif
|
|---|
| 682 | #else
|
|---|
| 683 | # define __fortified_attr_access(a, o, s)
|
|---|
| 684 | # define __attr_access(x)
|
|---|
| 685 | # define __attr_access_none(argno)
|
|---|
| 686 | #endif
|
|---|
| 687 |
|
|---|
| 688 | #if __GNUC_PREREQ (11, 0)
|
|---|
| 689 | /* Designates dealloc as a function to call to deallocate objects
|
|---|
| 690 | allocated by the declared function. */
|
|---|
| 691 | # define __attr_dealloc(dealloc, argno) \
|
|---|
| 692 | __attribute__ ((__malloc__ (dealloc, argno)))
|
|---|
| 693 | # define __attr_dealloc_free __attr_dealloc (__builtin_free, 1)
|
|---|
| 694 | #else
|
|---|
| 695 | # define __attr_dealloc(dealloc, argno)
|
|---|
| 696 | # define __attr_dealloc_free
|
|---|
| 697 | #endif
|
|---|
| 698 |
|
|---|
| 699 | /* Specify that a function such as setjmp or vfork may return
|
|---|
| 700 | twice. */
|
|---|
| 701 | #if __GNUC_PREREQ (4, 1)
|
|---|
| 702 | # define __attribute_returns_twice__ __attribute__ ((__returns_twice__))
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| 703 | #else
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| 704 | # define __attribute_returns_twice__ /* Ignore. */
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| 705 | #endif
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| 706 |
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| 707 | #endif /* sys/cdefs.h */
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