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
44 #if AV_GCC_VERSION_AT_LEAST(2,5)
45 # define av_noreturn __attribute__((noreturn))
52 #if AV_GCC_VERSION_AT_LEAST(3,1)
53 # define av_noinline __attribute__((noinline))
60 #if AV_GCC_VERSION_AT_LEAST(3,1)
61 # define av_pure __attribute__((pure))
68 #if AV_GCC_VERSION_AT_LEAST(2,6)
69 # define av_const __attribute__((const))
76 #if AV_GCC_VERSION_AT_LEAST(4,3)
77 # define av_cold __attribute__((cold))
84 #if AV_GCC_VERSION_AT_LEAST(4,1)
85 # define av_flatten __attribute__((flatten))
91 #ifndef attribute_deprecated
92 #if AV_GCC_VERSION_AT_LEAST(3,1)
93 # define attribute_deprecated __attribute__((deprecated))
95 # define attribute_deprecated
100 * Disable warnings about deprecated features
101 * This is useful for sections of code kept for backward compatibility and
102 * scheduled for removal.
104 #ifndef AV_NOWARN_DEPRECATED
105 #if AV_GCC_VERSION_AT_LEAST(4,6)
106 # define AV_NOWARN_DEPRECATED(code) \
107 _Pragma("GCC diagnostic push") \
108 _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") \
110 _Pragma("GCC diagnostic pop")
112 # define AV_NOWARN_DEPRECATED(code) code
118 #if defined(__GNUC__)
119 # define av_unused __attribute__((unused))
126 * Mark a variable as used and prevent the compiler from optimizing it
127 * away. This is useful for variables accessed only from inline
128 * assembler without the compiler being aware.
131 #if AV_GCC_VERSION_AT_LEAST(3,1)
132 # define av_used __attribute__((used))
139 #if AV_GCC_VERSION_AT_LEAST(3,3)
140 # define av_alias __attribute__((may_alias))
147 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
148 # define av_uninit(x) x=x
150 # define av_uninit(x) x
155 # define av_builtin_constant_p __builtin_constant_p
156 # define av_printf_format(fmtpos, attrpos) __attribute__((__format__(__printf__, fmtpos, attrpos)))
158 # define av_builtin_constant_p(x) 0
159 # define av_printf_format(fmtpos, attrpos)
162 #endif /* AVUTIL_ATTRIBUTES_H */