MPD  0.19.5
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_CHECK_VERSION(major, minor) \
24  (defined(__GNUC__) && \
25  (__GNUC__ > (major) || (__GNUC__ == (major) && __GNUC_MINOR__ >= (minor))))
26 
27 #ifdef __GNUC__
28 #define GCC_VERSION (__GNUC__ * 10000 \
29  + __GNUC_MINOR__ * 100 \
30  + __GNUC_PATCHLEVEL__)
31 #else
32 #define GCC_VERSION 0
33 #endif
34 
35 #ifdef __clang__
36 # define CLANG_VERSION (__clang_major__ * 10000 \
37  + __clang_minor__ * 100 \
38  + __clang_patchlevel__)
39 # if __clang_major__ < 3
40 # error Sorry, your clang version is too old. You need at least version 3.1.
41 # endif
42 #elif defined(__GNUC__)
43 # if !GCC_CHECK_VERSION(4,6)
44 # error Sorry, your gcc version is too old. You need at least version 4.6.
45 # endif
46 #else
47 # warning Untested compiler. Use at your own risk!
48 #endif
49 
50 #if GCC_CHECK_VERSION(4,0)
51 
52 /* GCC 4.x */
53 
54 #define gcc_const __attribute__((const))
55 #define gcc_deprecated __attribute__((deprecated))
56 #define gcc_may_alias __attribute__((may_alias))
57 #define gcc_malloc __attribute__((malloc))
58 #define gcc_noreturn __attribute__((noreturn))
59 #define gcc_packed __attribute__((packed))
60 #define gcc_printf(a,b) __attribute__((format(printf, a, b)))
61 #define gcc_pure __attribute__((pure))
62 #define gcc_sentinel __attribute__((sentinel))
63 #define gcc_unused __attribute__((unused))
64 #define gcc_warn_unused_result __attribute__((warn_unused_result))
65 
66 #define gcc_nonnull(...) __attribute__((nonnull(__VA_ARGS__)))
67 #define gcc_nonnull_all __attribute__((nonnull))
68 
69 #define gcc_likely(x) __builtin_expect (!!(x), 1)
70 #define gcc_unlikely(x) __builtin_expect (!!(x), 0)
71 
72 #define gcc_aligned(n) __attribute__((aligned(n)))
73 
74 #define gcc_visibility_hidden __attribute__((visibility("hidden")))
75 #define gcc_visibility_default __attribute__((visibility("default")))
76 
77 #define gcc_always_inline __attribute__((always_inline))
78 
79 #else
80 
81 /* generic C compiler */
82 
83 #define gcc_const
84 #define gcc_deprecated
85 #define gcc_may_alias
86 #define gcc_malloc
87 #define gcc_noreturn
88 #define gcc_packed
89 #define gcc_printf(a,b)
90 #define gcc_pure
91 #define gcc_sentinel
92 #define gcc_unused
93 #define gcc_warn_unused_result
94 
95 #define gcc_nonnull(...)
96 #define gcc_nonnull_all
97 
98 #define gcc_likely(x) (x)
99 #define gcc_unlikely(x) (x)
100 
101 #define gcc_aligned(n)
102 
103 #define gcc_visibility_hidden
104 #define gcc_visibility_default
105 
106 #define gcc_always_inline inline
107 
108 #endif
109 
110 #if GCC_CHECK_VERSION(4,3)
111 
112 #define gcc_hot __attribute__((hot))
113 #define gcc_cold __attribute__((cold))
114 
115 #else /* ! GCC_UNUSED >= 40300 */
116 
117 #define gcc_hot
118 #define gcc_cold
119 
120 #endif /* ! GCC_UNUSED >= 40300 */
121 
122 #if GCC_CHECK_VERSION(4,6) && !defined(__clang__)
123 #define gcc_flatten __attribute__((flatten))
124 #else
125 #define gcc_flatten
126 #endif
127 
128 #ifndef __cplusplus
129 /* plain C99 has "restrict" */
130 #define gcc_restrict restrict
131 #elif GCC_CHECK_VERSION(4,0)
132 /* "__restrict__" is a GCC extension for C++ */
133 #define gcc_restrict __restrict__
134 #else
135 /* disable it on other compilers */
136 #define gcc_restrict
137 #endif
138 
139 /* C++11 features */
140 
141 #if defined(__cplusplus)
142 
143 /* support for C++11 "override" was added in gcc 4.7 */
144 #if !defined(__clang__) && !GCC_CHECK_VERSION(4,7)
145 #define override
146 #define final
147 #endif
148 
149 #if defined(__clang__) || GCC_CHECK_VERSION(4,8)
150 #define gcc_alignas(T, fallback) alignas(T)
151 #else
152 #define gcc_alignas(T, fallback) gcc_aligned(fallback)
153 #endif
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