/* * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; 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))#    define AV_GCC_VERSION_AT_MOST(x,y)  (__GNUC__ < (x) || __GNUC__ == (x) && __GNUC_MINOR__ <= (y))#else#    define AV_GCC_VERSION_AT_LEAST(x,y) 0#    define AV_GCC_VERSION_AT_MOST(x,y)  0#endif #ifdef __has_builtin#    define AV_HAS_BUILTIN(x) __has_builtin(x)#else#    define AV_HAS_BUILTIN(x) 0#endif #ifndef av_always_inline#if AV_GCC_VERSION_AT_LEAST(3,1)#    define av_always_inline __attribute__((always_inline)) inline#elif defined(_MSC_VER)#    define av_always_inline __forceinline#else#    define av_always_inline inline#endif#endif #ifndef av_extern_inline#if defined(__ICL) && __ICL >= 1210 || defined(__GNUC_STDC_INLINE__)#    define av_extern_inline extern inline#else#    define av_extern_inline inline#endif#endif #if AV_GCC_VERSION_AT_LEAST(3,4)#    define av_warn_unused_result __attribute__((warn_unused_result))#else#    define av_warn_unused_result#endif #if AV_GCC_VERSION_AT_LEAST(3,1)#    define av_noinline __attribute__((noinline))#elif defined(_MSC_VER)#    define av_noinline __declspec(noinline)#else#    define av_noinline#endif #if AV_GCC_VERSION_AT_LEAST(3,1) || defined(__clang__)#    define av_pure __attribute__((pure))#else#    define av_pure#endif #if AV_GCC_VERSION_AT_LEAST(2,6) || defined(__clang__)#    define av_const __attribute__((const))#else#    define av_const#endif #if AV_GCC_VERSION_AT_LEAST(4,3) || defined(__clang__)#    define av_cold __attribute__((cold))#else#    define av_cold#endif #if AV_GCC_VERSION_AT_LEAST(4,1) && !defined(__llvm__)#    define av_flatten __attribute__((flatten))#else#    define av_flatten#endif #if AV_GCC_VERSION_AT_LEAST(3,1)#    define attribute_deprecated __attribute__((deprecated))#elif defined(_MSC_VER)#    define attribute_deprecated __declspec(deprecated)#else#    define attribute_deprecated#endif /** * Disable warnings about deprecated features * This is useful for sections of code kept for backward compatibility and * scheduled for removal. */#ifndef AV_NOWARN_DEPRECATED#if AV_GCC_VERSION_AT_LEAST(4,6) || defined(__clang__)#    define AV_NOWARN_DEPRECATED(code) \        _Pragma("GCC diagnostic push") \        _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"") \        code \        _Pragma("GCC diagnostic pop")#elif defined(_MSC_VER)#    define AV_NOWARN_DEPRECATED(code) \        __pragma(warning(push)) \        __pragma(warning(disable : 4996)) \        code; \        __pragma(warning(pop))#else#    define AV_NOWARN_DEPRECATED(code) code#endif#endif #if defined(__GNUC__) || defined(__clang__)#    define av_unused __attribute__((unused))#else#    define av_unused#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. */#if AV_GCC_VERSION_AT_LEAST(3,1) || defined(__clang__)#    define av_used __attribute__((used))#else#    define av_used#endif #if AV_GCC_VERSION_AT_LEAST(3,3) || defined(__clang__)#   define av_alias __attribute__((may_alias))#else#   define av_alias#endif #if (defined(__GNUC__) || defined(__clang__)) && !defined(__INTEL_COMPILER)#    define av_uninit(x) x=x#else#    define av_uninit(x) x#endif #if defined(__GNUC__) || defined(__clang__)#    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 #if AV_GCC_VERSION_AT_LEAST(2,5) || defined(__clang__)#    define av_noreturn __attribute__((noreturn))#else#    define av_noreturn#endif #endif /* AVUTIL_ATTRIBUTES_H */