1 /* 2 * Copyright (c) 2015 Dmitry V. Levin <ldv (at) altlinux.org> 3 * Copyright (c) 2015-2017 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 __attribute__(x) /* empty */ 37 # define GNUC_PREREQ(maj, min) 0 38 #endif 39 40 #if GNUC_PREREQ(2, 5) 41 # define ATTRIBUTE_NORETURN __attribute__((__noreturn__)) 42 #else 43 # define ATTRIBUTE_NORETURN /* empty */ 44 #endif 45 46 #if GNUC_PREREQ(2, 7) 47 # define ATTRIBUTE_FORMAT(args) __attribute__((__format__ args)) 48 # define ATTRIBUTE_ALIGNED(arg) __attribute__((__aligned__(arg))) 49 # define ATTRIBUTE_PACKED __attribute__((__packed__)) 50 #else 51 # define ATTRIBUTE_FORMAT(args) /* empty */ 52 # define ATTRIBUTE_ALIGNED(arg) /* empty */ 53 # define ATTRIBUTE_PACKED /* empty */ 54 #endif 55 56 #if GNUC_PREREQ(3, 0) 57 # define SAME_TYPE(x, y) __builtin_types_compatible_p(typeof(x), typeof(y)) 58 # define FAIL_BUILD_ON_ZERO(expr) (sizeof(int[-1 + 2 * !!(expr)]) * 0) 59 /* &(a)[0] is a pointer and not an array, shouldn't be treated as the same */ 60 # define MUST_BE_ARRAY(a) FAIL_BUILD_ON_ZERO(!SAME_TYPE((a), &(a)[0])) 61 #else 62 # define SAME_TYPE(x, y) 0 63 # define MUST_BE_ARRAY(a) 0 64 #endif 65 66 #if GNUC_PREREQ(3, 0) 67 # define ATTRIBUTE_MALLOC __attribute__((__malloc__)) 68 #else 69 # define ATTRIBUTE_MALLOC /* empty */ 70 #endif 71 72 #if GNUC_PREREQ(3, 1) 73 # define ATTRIBUTE_NOINLINE __attribute__((__noinline__)) 74 #else 75 # define ATTRIBUTE_NOINLINE /* empty */ 76 #endif 77 78 #if GNUC_PREREQ(4, 0) 79 # define ATTRIBUTE_SENTINEL __attribute__((__sentinel__)) 80 #else 81 # define ATTRIBUTE_SENTINEL /* empty */ 82 #endif 83 84 #if GNUC_PREREQ(4, 1) 85 # define ALIGNOF(t_) __alignof__(t_) 86 #else 87 # define ALIGNOF(t_) (sizeof(struct { char x_; t_ y_; }) - sizeof(t_)) 88 #endif 89 90 #if GNUC_PREREQ(4, 3) 91 # define ATTRIBUTE_ALLOC_SIZE(args) __attribute__((__alloc_size__ args)) 92 #else 93 # define ATTRIBUTE_ALLOC_SIZE(args) /* empty */ 94 #endif 95 96 #endif /* !STRACE_GCC_COMPAT_H */ 97
