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