1 /* 2 * Copyright (C) 2003-2013 The Music Player Daemon Project 3 * http://www.musicpd.org 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License along 16 * with this program; if not, write to the Free Software Foundation, Inc., 17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 18 */ 19 20 #ifndef COMPILER_H 21 #define COMPILER_H 22 23 #define GCC_MAKE_VERSION(major, minor, patchlevel) ((major) * 10000 + (minor) * 100 + patchlevel) 24 25 #ifdef __GNUC__ 26 # define GCC_VERSION GCC_MAKE_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__) 27 #else 28 # define GCC_VERSION 0 29 #endif 30 31 #ifdef __clang__ 32 # define CLANG_VERSION GCC_MAKE_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__) 33 #else 34 # define CLANG_VERSION 0 35 #endif 36 37 /** 38 * Are we building with the specified version of gcc (not clang or any 39 * other compiler) or newer? 40 */ 41 #define GCC_CHECK_VERSION(major, minor) \ 42 (!CLANG_VERSION && \ 43 GCC_VERSION >= GCC_MAKE_VERSION(major, minor, 0)) 44 45 /** 46 * Are we building with clang (any version) or at least the specified 47 * gcc version? 48 */ 49 #define CLANG_OR_GCC_VERSION(major, minor) \ 50 (CLANG_VERSION || GCC_CHECK_VERSION(major, minor)) 51 52 /** 53 * Are we building with gcc (not clang or any other compiler) and a 54 * version older than the specified one? 55 */ 56 #define GCC_OLDER_THAN(major, minor) \ 57 (GCC_VERSION && !CLANG_VERSION && \ 58 GCC_VERSION < GCC_MAKE_VERSION(major, minor, 0)) 59 60 #if CLANG_OR_GCC_VERSION(4,0) 61 62 /* GCC 4.x */ 63 64 #define gcc_const __attribute__((const)) 65 #define gcc_deprecated __attribute__((deprecated)) 66 #define gcc_may_alias __attribute__((may_alias)) 67 #define gcc_malloc __attribute__((malloc)) 68 #define gcc_noreturn __attribute__((noreturn)) 69 #define gcc_packed __attribute__((packed)) 70 #define gcc_printf(a,b) __attribute__((format(printf, a, b))) 71 #define gcc_pure __attribute__((pure)) 72 #define gcc_sentinel __attribute__((sentinel)) 73 #define gcc_unused __attribute__((unused)) 74 #define gcc_warn_unused_result __attribute__((warn_unused_result)) 75 76 #define gcc_nonnull(...) __attribute__((nonnull(__VA_ARGS__))) 77 #define gcc_nonnull_all __attribute__((nonnull)) 78 #define gcc_returns_nonnull __attribute__((returns_nonnull)) 79 80 #define gcc_likely(x) __builtin_expect (!!(x), 1) 81 #define gcc_unlikely(x) __builtin_expect (!!(x), 0) 82 83 #define gcc_aligned(n) __attribute__((aligned(n))) 84 85 #define gcc_visibility_hidden __attribute__((visibility("hidden"))) 86 #define gcc_visibility_default __attribute__((visibility("default"))) 87 88 #define gcc_always_inline __attribute__((always_inline)) 89 90 #else 91 92 /* generic C compiler */ 93 94 #define gcc_const 95 #define gcc_deprecated 96 #define gcc_may_alias 97 #define gcc_malloc 98 #define gcc_noreturn 99 #define gcc_packed 100 #define gcc_printf(a,b) 101 #define gcc_pure 102 #define gcc_sentinel 103 #define gcc_unused 104 #define gcc_warn_unused_result 105 106 #define gcc_nonnull(...) 107 #define gcc_nonnull_all 108 #define gcc_returns_nonnull 109 110 #define gcc_likely(x) (x) 111 #define gcc_unlikely(x) (x) 112 113 #define gcc_aligned(n) 114 115 #define gcc_visibility_hidden 116 #define gcc_visibility_default 117 118 #define gcc_always_inline inline 119 120 #endif 121 122 #if CLANG_OR_GCC_VERSION(4,3) 123 124 #define gcc_hot __attribute__((hot)) 125 #define gcc_cold __attribute__((cold)) 126 127 #else /* ! GCC_UNUSED >= 40300 */ 128 129 #define gcc_hot 130 #define gcc_cold 131 132 #endif /* ! GCC_UNUSED >= 40300 */ 133 134 #if GCC_CHECK_VERSION(4,6) 135 #define gcc_flatten __attribute__((flatten)) 136 #else 137 #define gcc_flatten 138 #endif 139 140 #ifndef __cplusplus 141 /* plain C99 has "restrict" */ 142 #define gcc_restrict restrict 143 #elif CLANG_OR_GCC_VERSION(4,0) 144 /* "__restrict__" is a GCC extension for C++ */ 145 #define gcc_restrict __restrict__ 146 #else 147 /* disable it on other compilers */ 148 #define gcc_restrict 149 #endif 150 151 /* C++11 features */ 152 153 #if defined(__cplusplus) 154 155 #endif 156 157 #ifndef __has_feature 158 // define dummy macro for non-clang compilers 159 #define __has_feature(x) 0 160 #endif 161 162 #if __has_feature(attribute_unused_on_fields) 163 #define gcc_unused_field gcc_unused 164 #else 165 #define gcc_unused_field 166 #endif 167 168 #if defined(__GNUC__) || defined(__clang__) 169 #define gcc_unreachable() __builtin_unreachable() 170 #else 171 #define gcc_unreachable() 172 #endif 173 174 #endif 175