MPD 0.19.21

- Main Page
- Files

- File List
- Globals

Compiler.h
Go to the documentation of this file.
1 /*
2 * Copyright (C) 2003-2014 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 #elif defined(__GNUC__)
34 # define CLANG_VERSION 0
35 #endif
36
41 #define GCC_CHECK_VERSION(major, minor) \
42 (CLANG_VERSION == 0 && \
43 GCC_VERSION >= GCC_MAKE_VERSION(major, minor, 0))
44
49 #define CLANG_OR_GCC_VERSION(major, minor) \
50 (CLANG_VERSION > 0 || GCC_CHECK_VERSION(major, minor))
51
56 #define GCC_OLDER_THAN(major, minor) \
57 (GCC_VERSION > 0 && CLANG_VERSION == 0 && \
58 GCC_VERSION < GCC_MAKE_VERSION(major, minor, 0))
59
60 #ifdef __clang__
61 # if __clang_major__ < 3
62 # error Sorry, your clang version is too old. You need at least version 3.1.
63 # endif
64 #elif defined(__GNUC__)
65 # if GCC_OLDER_THAN(4,7)
66 # error Sorry, your gcc version is too old. You need at least version 4.6.
67 # endif
68 #else
69 # warning Untested compiler. Use at your own risk!
70 #endif
71
75 #define CLANG_CHECK_VERSION(major, minor) \
76 (CLANG_VERSION >= GCC_MAKE_VERSION(major, minor, 0))
77
78 #if CLANG_OR_GCC_VERSION(4,0)
79
80 /* GCC 4.x */
81
82 #define gcc_const __attribute__((const))
83 #define gcc_deprecated __attribute__((deprecated))
84 #define gcc_may_alias __attribute__((may_alias))
85 #define gcc_malloc __attribute__((malloc))
86 #define gcc_noreturn __attribute__((noreturn))
87 #define gcc_packed __attribute__((packed))
88 #define gcc_printf(a,b) __attribute__((format(printf, a, b)))
89 #define gcc_pure __attribute__((pure))
90 #define gcc_sentinel __attribute__((sentinel))
91 #define gcc_unused __attribute__((unused))
92 #define gcc_warn_unused_result __attribute__((warn_unused_result))
93
94 #define gcc_nonnull(...) __attribute__((nonnull(__VA_ARGS__)))
95 #define gcc_nonnull_all __attribute__((nonnull))
96
97 #define gcc_likely(x) __builtin_expect (!!(x), 1)
98 #define gcc_unlikely(x) __builtin_expect (!!(x), 0)
99
100 #define gcc_aligned(n) __attribute__((aligned(n)))
101
102 #define gcc_visibility_hidden __attribute__((visibility("hidden")))
103 #define gcc_visibility_default __attribute__((visibility("default")))
104
105 #define gcc_always_inline __attribute__((always_inline))
106
107 #else
108
109 /* generic C compiler */
110
111 #define gcc_const
112 #define gcc_deprecated
113 #define gcc_may_alias
114 #define gcc_malloc
115 #define gcc_noreturn
116 #define gcc_packed
117 #define gcc_printf(a,b)
118 #define gcc_pure
119 #define gcc_sentinel
120 #define gcc_unused
121 #define gcc_warn_unused_result
122
123 #define gcc_nonnull(...)
124 #define gcc_nonnull_all
125
126 #define gcc_likely(x) (x)
127 #define gcc_unlikely(x) (x)
128
129 #define gcc_aligned(n)
130
131 #define gcc_visibility_hidden
132 #define gcc_visibility_default
133
134 #define gcc_always_inline inline
135
136 #endif
137
138 #if CLANG_OR_GCC_VERSION(4,3)
139
140 #define gcc_hot __attribute__((hot))
141 #define gcc_cold __attribute__((cold))
142
143 #else /* ! GCC_UNUSED >= 40300 */
144
145 #define gcc_hot
146 #define gcc_cold
147
148 #endif /* ! GCC_UNUSED >= 40300 */
149
150 #if GCC_CHECK_VERSION(4,6)
151 #define gcc_flatten __attribute__((flatten))
152 #else
153 #define gcc_flatten
154 #endif
155
156 #ifndef __cplusplus
157 /* plain C99 has "restrict" */
158 #define gcc_restrict restrict
159 #elif CLANG_OR_GCC_VERSION(4,0)
160 /* "__restrict__" is a GCC extension for C++ */
161 #define gcc_restrict __restrict__
162 #else
163 /* disable it on other compilers */
164 #define gcc_restrict
165 #endif
166
167 /* C++11 features */
168
169 #if defined(__cplusplus)
170
171 /* support for C++11 "override" was added in gcc 4.7 */
172 #if GCC_OLDER_THAN(4,7)
173 #define override
174 #define final
175 #endif
176
177 #if CLANG_OR_GCC_VERSION(4,8)
178 #define gcc_alignas(T, fallback) alignas(T)
179 #else
180 #define gcc_alignas(T, fallback) gcc_aligned(fallback)
181 #endif
182
183 #endif
184
185 #ifndef __has_feature
186 // define dummy macro for non-clang compilers
187 #define __has_feature(x) 0
188 #endif
189
190 #if __has_feature(attribute_unused_on_fields)
191 #define gcc_unused_field gcc_unused
192 #else
193 #define gcc_unused_field
194 #endif
195
196 #if defined(__GNUC__) || defined(__clang__)
197 #define gcc_unreachable() __builtin_unreachable()
198 #else
199 #define gcc_unreachable()
200 #endif
201
202 #endif