yading@11: /*
yading@11:  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * Macro definitions for various function/variable attributes
yading@11:  */
yading@11: 
yading@11: #ifndef AVUTIL_ATTRIBUTES_H
yading@11: #define AVUTIL_ATTRIBUTES_H
yading@11: 
yading@11: #ifdef __GNUC__
yading@11: #    define AV_GCC_VERSION_AT_LEAST(x,y) (__GNUC__ > x || __GNUC__ == x && __GNUC_MINOR__ >= y)
yading@11: #else
yading@11: #    define AV_GCC_VERSION_AT_LEAST(x,y) 0
yading@11: #endif
yading@11: 
yading@11: #ifndef av_always_inline
yading@11: #if AV_GCC_VERSION_AT_LEAST(3,1)
yading@11: #    define av_always_inline __attribute__((always_inline)) inline
yading@11: #elif defined(_MSC_VER)
yading@11: #    define av_always_inline __forceinline
yading@11: #else
yading@11: #    define av_always_inline inline
yading@11: #endif
yading@11: #endif
yading@11: 
yading@11: #ifndef av_extern_inline
yading@11: #if defined(__ICL) && __ICL >= 1210 || defined(__GNUC_STDC_INLINE__)
yading@11: #    define av_extern_inline extern inline
yading@11: #else
yading@11: #    define av_extern_inline inline
yading@11: #endif
yading@11: #endif
yading@11: 
yading@11: #if AV_GCC_VERSION_AT_LEAST(3,1)
yading@11: #    define av_noinline __attribute__((noinline))
yading@11: #else
yading@11: #    define av_noinline
yading@11: #endif
yading@11: 
yading@11: #if AV_GCC_VERSION_AT_LEAST(3,1)
yading@11: #    define av_pure __attribute__((pure))
yading@11: #else
yading@11: #    define av_pure
yading@11: #endif
yading@11: 
yading@11: #ifndef av_restrict
yading@11: #define av_restrict restrict
yading@11: #endif
yading@11: 
yading@11: #if AV_GCC_VERSION_AT_LEAST(2,6)
yading@11: #    define av_const __attribute__((const))
yading@11: #else
yading@11: #    define av_const
yading@11: #endif
yading@11: 
yading@11: #if AV_GCC_VERSION_AT_LEAST(4,3)
yading@11: #    define av_cold __attribute__((cold))
yading@11: #else
yading@11: #    define av_cold
yading@11: #endif
yading@11: 
yading@11: #if AV_GCC_VERSION_AT_LEAST(4,1)
yading@11: #    define av_flatten __attribute__((flatten))
yading@11: #else
yading@11: #    define av_flatten
yading@11: #endif
yading@11: 
yading@11: #if AV_GCC_VERSION_AT_LEAST(3,1)
yading@11: #    define attribute_deprecated __attribute__((deprecated))
yading@11: #else
yading@11: #    define attribute_deprecated
yading@11: #endif
yading@11: 
yading@11: /**
yading@11:  * Disable warnings about deprecated features
yading@11:  * This is useful for sections of code kept for backward compatibility and
yading@11:  * scheduled for removal.
yading@11:  */
yading@11: #ifndef AV_NOWARN_DEPRECATED
yading@11: #if AV_GCC_VERSION_AT_LEAST(4,6)
yading@11: #    define AV_NOWARN_DEPRECATED(code) \
yading@11:         _Pragma("GCC diagnostic push") \
yading@11:         _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") \
yading@11:         code \
yading@11:         _Pragma("GCC diagnostic pop")
yading@11: #else
yading@11: #    define AV_NOWARN_DEPRECATED(code) code
yading@11: #endif
yading@11: #endif
yading@11: 
yading@11: 
yading@11: #if defined(__GNUC__)
yading@11: #    define av_unused __attribute__((unused))
yading@11: #else
yading@11: #    define av_unused
yading@11: #endif
yading@11: 
yading@11: /**
yading@11:  * Mark a variable as used and prevent the compiler from optimizing it
yading@11:  * away.  This is useful for variables accessed only from inline
yading@11:  * assembler without the compiler being aware.
yading@11:  */
yading@11: #if AV_GCC_VERSION_AT_LEAST(3,1)
yading@11: #    define av_used __attribute__((used))
yading@11: #else
yading@11: #    define av_used
yading@11: #endif
yading@11: 
yading@11: #if AV_GCC_VERSION_AT_LEAST(3,3)
yading@11: #   define av_alias __attribute__((may_alias))
yading@11: #else
yading@11: #   define av_alias
yading@11: #endif
yading@11: 
yading@11: #if defined(__GNUC__) && !defined(__INTEL_COMPILER) && !defined(__clang__)
yading@11: #    define av_uninit(x) x=x
yading@11: #else
yading@11: #    define av_uninit(x) x
yading@11: #endif
yading@11: 
yading@11: #ifdef __GNUC__
yading@11: #    define av_builtin_constant_p __builtin_constant_p
yading@11: #    define av_printf_format(fmtpos, attrpos) __attribute__((__format__(__printf__, fmtpos, attrpos)))
yading@11: #else
yading@11: #    define av_builtin_constant_p(x) 0
yading@11: #    define av_printf_format(fmtpos, attrpos)
yading@11: #endif
yading@11: 
yading@11: #if AV_GCC_VERSION_AT_LEAST(2,5)
yading@11: #    define av_noreturn __attribute__((noreturn))
yading@11: #else
yading@11: #    define av_noreturn
yading@11: #endif
yading@11: 
yading@11: #endif /* AVUTIL_ATTRIBUTES_H */