2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * Macro definitions for various function/variable attributes
26 #ifndef AVUTIL_ATTRIBUTES_H
27 #define AVUTIL_ATTRIBUTES_H
30 # define AV_GCC_VERSION_AT_LEAST(x,y) (__GNUC__ > x || __GNUC__ == x && __GNUC_MINOR__ >= y)
32 # define AV_GCC_VERSION_AT_LEAST(x,y) 0
35 #ifndef av_always_inline
36 #if AV_GCC_VERSION_AT_LEAST(3,1)
37 # define av_always_inline __attribute__((always_inline)) inline
39 # define av_always_inline inline
43 #ifndef av_extern_inline
44 #if defined(__ICL) && __ICL >= 1210 || defined(__GNUC_STDC_INLINE__)
45 # define av_extern_inline extern inline
47 # define av_extern_inline inline
52 #if AV_GCC_VERSION_AT_LEAST(2,5)
53 # define av_noreturn __attribute__((noreturn))
60 #if AV_GCC_VERSION_AT_LEAST(3,1)
61 # define av_noinline __attribute__((noinline))
68 #if AV_GCC_VERSION_AT_LEAST(3,1)
69 # define av_pure __attribute__((pure))
76 #define av_restrict restrict
80 #if AV_GCC_VERSION_AT_LEAST(2,6)
81 # define av_const __attribute__((const))
88 #if AV_GCC_VERSION_AT_LEAST(4,3)
89 # define av_cold __attribute__((cold))
96 #if AV_GCC_VERSION_AT_LEAST(4,1)
97 # define av_flatten __attribute__((flatten))
103 #ifndef attribute_deprecated
104 #if AV_GCC_VERSION_AT_LEAST(3,1)
105 # define attribute_deprecated __attribute__((deprecated))
107 # define attribute_deprecated
112 * Disable warnings about deprecated features
113 * This is useful for sections of code kept for backward compatibility and
114 * scheduled for removal.
116 #ifndef AV_NOWARN_DEPRECATED
117 #if AV_GCC_VERSION_AT_LEAST(4,6)
118 # define AV_NOWARN_DEPRECATED(code) \
119 _Pragma("GCC diagnostic push") \
120 _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") \
122 _Pragma("GCC diagnostic pop")
124 # define AV_NOWARN_DEPRECATED(code) code
130 #if defined(__GNUC__)
131 # define av_unused __attribute__((unused))
138 * Mark a variable as used and prevent the compiler from optimizing it
139 * away. This is useful for variables accessed only from inline
140 * assembler without the compiler being aware.
143 #if AV_GCC_VERSION_AT_LEAST(3,1)
144 # define av_used __attribute__((used))
151 #if AV_GCC_VERSION_AT_LEAST(3,3)
152 # define av_alias __attribute__((may_alias))
159 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
160 # define av_uninit(x) x=x
162 # define av_uninit(x) x
167 # define av_builtin_constant_p __builtin_constant_p
168 # define av_printf_format(fmtpos, attrpos) __attribute__((__format__(__printf__, fmtpos, attrpos)))
170 # define av_builtin_constant_p(x) 0
171 # define av_printf_format(fmtpos, attrpos)
174 #endif /* AVUTIL_ATTRIBUTES_H */