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/*
* Copyright 2003-2020 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef COMPILER_H
#define COMPILER_H
#define GCC_MAKE_VERSION(major, minor, patchlevel) ((major) * 10000 + (minor) * 100 + patchlevel)
#ifdef __GNUC__
#define GCC_VERSION GCC_MAKE_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
#else
#define GCC_VERSION 0
#endif
#ifdef __clang__
# define CLANG_VERSION GCC_MAKE_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__)
#elif defined(__GNUC__)
# define CLANG_VERSION 0
#endif
/**
* Are we building with the specified version of gcc (not clang or any
* other compiler) or newer?
*/
#define GCC_CHECK_VERSION(major, minor) \
(CLANG_VERSION == 0 && \
GCC_VERSION >= GCC_MAKE_VERSION(major, minor, 0))
/**
* Are we building with clang (any version) or at least the specified
* gcc version?
*/
#define CLANG_OR_GCC_VERSION(major, minor) \
(CLANG_VERSION > 0 || GCC_CHECK_VERSION(major, minor))
/**
* Are we building with gcc (not clang or any other compiler) and a
* version older than the specified one?
*/
#define GCC_OLDER_THAN(major, minor) \
(GCC_VERSION > 0 && CLANG_VERSION == 0 && \
GCC_VERSION < GCC_MAKE_VERSION(major, minor, 0))
/**
* Are we building with the specified version of clang or newer?
*/
#define CLANG_CHECK_VERSION(major, minor) \
(CLANG_VERSION >= GCC_MAKE_VERSION(major, minor, 0))
#if CLANG_OR_GCC_VERSION(4,0)
/* GCC 4.x */
#define gcc_const __attribute__((const))
#define gcc_may_alias __attribute__((may_alias))
#define gcc_malloc __attribute__((malloc))
#define gcc_packed __attribute__((packed))
#define gcc_printf(a,b) __attribute__((format(printf, a, b)))
#define gcc_pure __attribute__((pure))
#define gcc_sentinel __attribute__((sentinel))
#define gcc_unused __attribute__((unused))
#define gcc_warn_unused_result __attribute__((warn_unused_result))
#define gcc_nonnull(...) __attribute__((nonnull(__VA_ARGS__)))
#define gcc_nonnull_all __attribute__((nonnull))
#define gcc_returns_nonnull __attribute__((returns_nonnull))
#define gcc_returns_twice __attribute__((returns_twice))
#define gcc_likely(x) __builtin_expect (!!(x), 1)
#define gcc_unlikely(x) __builtin_expect (!!(x), 0)
#define gcc_visibility_hidden __attribute__((visibility("hidden")))
#define gcc_visibility_default __attribute__((visibility("default")))
#define gcc_noinline __attribute__((noinline))
#define gcc_always_inline __attribute__((always_inline))
#else
/* generic C compiler */
#define gcc_const
#define gcc_may_alias
#define gcc_malloc
#define gcc_packed
#define gcc_printf(a,b)
#define gcc_pure
#define gcc_sentinel
#define gcc_unused
#define gcc_warn_unused_result
#define gcc_nonnull(...)
#define gcc_nonnull_all
#define gcc_returns_nonnull
#define gcc_returns_twice
#define gcc_likely(x) (x)
#define gcc_unlikely(x) (x)
#define gcc_visibility_hidden
#define gcc_visibility_default
#define gcc_noinline
#define gcc_always_inline inline
#endif
#if CLANG_OR_GCC_VERSION(4,3)
#define gcc_hot __attribute__((hot))
#define gcc_cold __attribute__((cold))
#else /* ! GCC_UNUSED >= 40300 */
#define gcc_hot
#define gcc_cold
#endif /* ! GCC_UNUSED >= 40300 */
#if GCC_CHECK_VERSION(4,6)
#define gcc_flatten __attribute__((flatten))
#else
#define gcc_flatten
#endif
#if GCC_CHECK_VERSION(7,0)
#define gcc_fallthrough __attribute__((fallthrough))
#elif CLANG_CHECK_VERSION(10,0) && defined(__cplusplus)
#define gcc_fallthrough [[fallthrough]]
#else
#define gcc_fallthrough
#endif
#ifndef __cplusplus
/* plain C99 has "restrict" */
#define gcc_restrict restrict
#elif CLANG_OR_GCC_VERSION(4,0)
/* "__restrict__" is a GCC extension for C++ */
#define gcc_restrict __restrict__
#else
/* disable it on other compilers */
#define gcc_restrict
#endif
#ifndef __has_feature
// define dummy macro for non-clang compilers
#define __has_feature(x) 0
#endif
#if __has_feature(attribute_unused_on_fields)
#define gcc_unused_field gcc_unused
#else
#define gcc_unused_field
#endif
#if defined(__GNUC__) || defined(__clang__)
#define gcc_unreachable() __builtin_unreachable()
#else
#define gcc_unreachable()
#endif
#endif
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