1 /* 2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org> 3 * Copyright (c) 2015-2018 The strace developers. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifndef STRACE_GCC_COMPAT_H 30 #define STRACE_GCC_COMPAT_H 31 32 #if defined __GNUC__ && defined __GNUC_MINOR__ 33 # define GNUC_PREREQ(maj, min) \ 34 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) 35 #else 36 # define GNUC_PREREQ(maj, min) 0 37 #endif 38 39 #if defined __clang__ && defined __clang_major__ && defined __clang_minor__ 40 # define CLANG_PREREQ(maj, min) \ 41 ((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min)) 42 #else 43 # define CLANG_PREREQ(maj, min) 0 44 #endif 45 46 #if !(GNUC_PREREQ(2, 0) || CLANG_PREREQ(1, 0)) 47 # define __attribute__(x) /* empty */ 48 #endif 49 50 #if GNUC_PREREQ(2, 5) 51 # define ATTRIBUTE_NORETURN __attribute__((__noreturn__)) 52 #else 53 # define ATTRIBUTE_NORETURN /* empty */ 54 #endif 55 56 #if GNUC_PREREQ(2, 7) 57 # define ATTRIBUTE_FORMAT(args) __attribute__((__format__ args)) 58 # define ATTRIBUTE_ALIGNED(arg) __attribute__((__aligned__(arg))) 59 # define ATTRIBUTE_PACKED __attribute__((__packed__)) 60 #else 61 # define ATTRIBUTE_FORMAT(args) /* empty */ 62 # define ATTRIBUTE_ALIGNED(arg) /* empty */ 63 # define ATTRIBUTE_PACKED /* empty */ 64 #endif 65 66 #if GNUC_PREREQ(3, 0) 67 # define SAME_TYPE(x, y) __builtin_types_compatible_p(typeof(x), typeof(y)) 68 # define FAIL_BUILD_ON_ZERO(expr) (sizeof(int[-1 + 2 * !!(expr)]) * 0) 69 /* &(a)[0] is a pointer and not an array, shouldn't be treated as the same */ 70 # define MUST_BE_ARRAY(a) FAIL_BUILD_ON_ZERO(!SAME_TYPE((a), &(a)[0])) 71 #else 72 # define SAME_TYPE(x, y) 0 73 # define MUST_BE_ARRAY(a) 0 74 #endif 75 76 #if GNUC_PREREQ(3, 0) 77 # define ATTRIBUTE_MALLOC __attribute__((__malloc__)) 78 #else 79 # define ATTRIBUTE_MALLOC /* empty */ 80 #endif 81 82 #if GNUC_PREREQ(3, 1) 83 # define ATTRIBUTE_NOINLINE __attribute__((__noinline__)) 84 #else 85 # define ATTRIBUTE_NOINLINE /* empty */ 86 #endif 87 88 #if GNUC_PREREQ(4, 0) 89 # define ATTRIBUTE_SENTINEL __attribute__((__sentinel__)) 90 #else 91 # define ATTRIBUTE_SENTINEL /* empty */ 92 #endif 93 94 #if GNUC_PREREQ(4, 1) 95 # define ALIGNOF(t_) __alignof__(t_) 96 #else 97 # define ALIGNOF(t_) (sizeof(struct { char x_; t_ y_; }) - sizeof(t_)) 98 #endif 99 100 #if GNUC_PREREQ(4, 3) 101 # define ATTRIBUTE_ALLOC_SIZE(args) __attribute__((__alloc_size__ args)) 102 #else 103 # define ATTRIBUTE_ALLOC_SIZE(args) /* empty */ 104 #endif 105 106 #if GNUC_PREREQ(7, 0) 107 # define ATTRIBUTE_FALLTHROUGH __attribute__((__fallthrough__)) 108 #else 109 # define ATTRIBUTE_FALLTHROUGH ((void) 0) 110 #endif 111 112 #if CLANG_PREREQ(2, 8) 113 # define DIAG_PUSH_IGNORE_OVERRIDE_INIT \ 114 _Pragma("clang diagnostic push"); \ 115 _Pragma("clang diagnostic ignored \"-Winitializer-overrides\""); 116 # define DIAG_POP_IGNORE_OVERRIDE_INIT \ 117 _Pragma("clang diagnostic pop"); 118 #elif GNUC_PREREQ(4, 2) 119 # define DIAG_PUSH_IGNORE_OVERRIDE_INIT \ 120 _Pragma("GCC diagnostic push"); \ 121 _Pragma("GCC diagnostic ignored \"-Woverride-init\""); 122 # define DIAG_POP_IGNORE_OVERRIDE_INIT \ 123 _Pragma("GCC diagnostic pop"); 124 #else 125 # define DIAG_PUSH_IGNORE_OVERRIDE_INIT /* empty */ 126 # define DIAG_POP_IGNORE_OVERRIDE_INIT /* empty */ 127 #endif 128 129 #if GNUC_PREREQ(6, 0) 130 # define DIAG_PUSH_IGNORE_TAUTOLOGICAL_COMPARE \ 131 _Pragma("GCC diagnostic push"); \ 132 _Pragma("GCC diagnostic ignored \"-Wtautological-compare\""); 133 # define DIAG_POP_IGNORE_TAUTOLOGICAL_COMPARE \ 134 _Pragma("GCC diagnostic pop"); 135 #else 136 # define DIAG_PUSH_IGNORE_TAUTOLOGICAL_COMPARE /* empty */ 137 # define DIAG_POP_IGNORE_TAUTOLOGICAL_COMPARE /* empty */ 138 #endif 139 140 #endif /* !STRACE_GCC_COMPAT_H */ 141