chromium/third_party/ffmpeg/libavutil/attributes.h

/*
 * copyright (c) 2006 Michael Niedermayer <[email protected]>
 *
 * 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) …
#define AV_GCC_VERSION_AT_MOST(x,y) …
#else
#define AV_GCC_VERSION_AT_LEAST …
#define AV_GCC_VERSION_AT_MOST …
#endif

#ifdef __has_builtin
#define AV_HAS_BUILTIN(x) …
#else
#define AV_HAS_BUILTIN …
#endif

#ifndef av_always_inline
#if AV_GCC_VERSION_AT_LEAST(3,1)
#define av_always_inline …
#elif defined(_MSC_VER)
#define av_always_inline …
#else
#define av_always_inline …
#endif
#endif

#ifndef av_extern_inline
#if defined(__ICL) && __ICL >= 1210 || defined(__GNUC_STDC_INLINE__)
#define av_extern_inline …
#else
#define av_extern_inline …
#endif
#endif

#if AV_GCC_VERSION_AT_LEAST(3,4)
#define av_warn_unused_result …
#else
#define av_warn_unused_result
#endif

#if AV_GCC_VERSION_AT_LEAST(3,1)
#define av_noinline …
#elif defined(_MSC_VER)
#define av_noinline …
#else
#define av_noinline
#endif

#if AV_GCC_VERSION_AT_LEAST(3,1) || defined(__clang__)
#define av_pure …
#else
#define av_pure
#endif

#if AV_GCC_VERSION_AT_LEAST(2,6) || defined(__clang__)
#define av_const …
#else
#define av_const
#endif

#if AV_GCC_VERSION_AT_LEAST(4,3) || defined(__clang__)
#define av_cold …
#else
#define av_cold
#endif

#if AV_GCC_VERSION_AT_LEAST(4,1) && !defined(__llvm__)
#define av_flatten …
#else
#define av_flatten
#endif

#if AV_GCC_VERSION_AT_LEAST(3,1)
#define attribute_deprecated …
#elif defined(_MSC_VER)
#define attribute_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) …
#elif defined(_MSC_VER)
#define AV_NOWARN_DEPRECATED …
#else
#define AV_NOWARN_DEPRECATED …
#endif
#endif

#if defined(__GNUC__) || defined(__clang__)
#define av_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 …
#else
#define av_used
#endif

#if AV_GCC_VERSION_AT_LEAST(3,3) || defined(__clang__)
#define av_alias …
#else
#define av_alias
#endif

#if (defined(__GNUC__) || defined(__clang__)) && !defined(__INTEL_COMPILER)
#define av_uninit(x) …
#else
#define av_uninit …
#endif

#if defined(__GNUC__) || defined(__clang__)
#define av_builtin_constant_p …
#define av_printf_format(fmtpos, attrpos) …
#else
#define av_builtin_constant_p …
#define av_printf_format …
#endif

#if AV_GCC_VERSION_AT_LEAST(2,5) || defined(__clang__)
#define av_noreturn …
#else
#define av_noreturn
#endif

#endif /* AVUTIL_ATTRIBUTES_H */