mpc-bar

macOS menu bar client for the Music Player Daemon
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Compiler.h (4170B)

      1 // SPDX-License-Identifier: GPL-2.0-or-later
      2 // Copyright The Music Player Daemon Project
      3 
      4 #ifndef COMPILER_H
      5 #define COMPILER_H
      6 
      7 #define GCC_MAKE_VERSION(major, minor, patchlevel) ((major) * 10000 + (minor) * 100 + patchlevel)
      8 
      9 #ifdef __GNUC__
     10 #define GCC_VERSION GCC_MAKE_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
     11 #else
     12 #define GCC_VERSION 0
     13 #endif
     14 
     15 #ifdef __clang__
     16 #  define CLANG_VERSION GCC_MAKE_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__)
     17 #else
     18 #  define CLANG_VERSION 0
     19 #endif
     20 
     21 /**
     22  * Are we building with the specified version of gcc (not clang or any
     23  * other compiler) or newer?
     24  */
     25 #define GCC_CHECK_VERSION(major, minor) \
     26 	(!CLANG_VERSION && \
     27 	 GCC_VERSION >= GCC_MAKE_VERSION(major, minor, 0))
     28 
     29 /**
     30  * Are we building with clang (any version) or at least the specified
     31  * gcc version?
     32  */
     33 #define CLANG_OR_GCC_VERSION(major, minor) \
     34 	(CLANG_VERSION || GCC_CHECK_VERSION(major, minor))
     35 
     36 /**
     37  * Are we building with gcc (not clang or any other compiler) and a
     38  * version older than the specified one?
     39  */
     40 #define GCC_OLDER_THAN(major, minor) \
     41 	(GCC_VERSION && !CLANG_VERSION && \
     42 	 GCC_VERSION < GCC_MAKE_VERSION(major, minor, 0))
     43 
     44 /**
     45  * Are we building with the specified version of clang or newer?
     46  */
     47 #define CLANG_CHECK_VERSION(major, minor) \
     48 	(CLANG_VERSION >= GCC_MAKE_VERSION(major, minor, 0))
     49 
     50 #if CLANG_OR_GCC_VERSION(4,0)
     51 
     52 /* GCC 4.x */
     53 
     54 #define gcc_const __attribute__((const))
     55 #define gcc_deprecated __attribute__((deprecated))
     56 #define gcc_may_alias __attribute__((may_alias))
     57 #define gcc_malloc __attribute__((malloc))
     58 #define gcc_noreturn __attribute__((noreturn))
     59 #define gcc_packed __attribute__((packed))
     60 #define gcc_printf(a,b) __attribute__((format(printf, a, b)))
     61 #define gcc_pure __attribute__((pure))
     62 #define gcc_sentinel __attribute__((sentinel))
     63 #define gcc_unused __attribute__((unused))
     64 #define gcc_warn_unused_result __attribute__((warn_unused_result))
     65 
     66 #define gcc_nonnull(...) __attribute__((nonnull(__VA_ARGS__)))
     67 #define gcc_nonnull_all __attribute__((nonnull))
     68 
     69 #define gcc_likely(x) __builtin_expect (!!(x), 1)
     70 #define gcc_unlikely(x) __builtin_expect (!!(x), 0)
     71 
     72 #define gcc_aligned(n) __attribute__((aligned(n)))
     73 
     74 #define gcc_visibility_hidden __attribute__((visibility("hidden")))
     75 #define gcc_visibility_default __attribute__((visibility("default")))
     76 
     77 #define gcc_always_inline __attribute__((always_inline))
     78 
     79 #else
     80 
     81 /* generic C compiler */
     82 
     83 #define gcc_const
     84 #define gcc_deprecated
     85 #define gcc_may_alias
     86 #define gcc_malloc
     87 #define gcc_noreturn
     88 #define gcc_packed
     89 #define gcc_printf(a,b)
     90 #define gcc_pure
     91 #define gcc_sentinel
     92 #define gcc_unused
     93 #define gcc_warn_unused_result
     94 
     95 #define gcc_nonnull(...)
     96 #define gcc_nonnull_all
     97 
     98 #define gcc_likely(x) (x)
     99 #define gcc_unlikely(x) (x)
    100 
    101 #define gcc_aligned(n)
    102 
    103 #define gcc_visibility_hidden
    104 #define gcc_visibility_default
    105 
    106 #define gcc_always_inline inline
    107 
    108 #endif
    109 
    110 #if CLANG_OR_GCC_VERSION(4,3)
    111 
    112 #define gcc_hot __attribute__((hot))
    113 #define gcc_cold __attribute__((cold))
    114 
    115 #else /* ! GCC_UNUSED >= 40300 */
    116 
    117 #define gcc_hot
    118 #define gcc_cold
    119 
    120 #endif /* ! GCC_UNUSED >= 40300 */
    121 
    122 #if GCC_CHECK_VERSION(4,6)
    123 #define gcc_flatten __attribute__((flatten))
    124 #else
    125 #define gcc_flatten
    126 #endif
    127 
    128 #ifndef __cplusplus
    129 /* plain C99 has "restrict" */
    130 #define gcc_restrict restrict
    131 #elif CLANG_OR_GCC_VERSION(4,0)
    132 /* "__restrict__" is a GCC extension for C++ */
    133 #define gcc_restrict __restrict__
    134 #else
    135 /* disable it on other compilers */
    136 #define gcc_restrict
    137 #endif
    138 
    139 /* C++11 features */
    140 
    141 #if defined(__cplusplus)
    142 
    143 /* support for C++11 "override" was added in gcc 4.7 */
    144 #if GCC_OLDER_THAN(4,7)
    145 #define override
    146 #define final
    147 #endif
    148 
    149 #if CLANG_OR_GCC_VERSION(4,8)
    150 #define gcc_alignas(T, fallback) alignas(T)
    151 #else
    152 #define gcc_alignas(T, fallback) gcc_aligned(fallback)
    153 #endif
    154 
    155 #endif
    156 
    157 #ifndef __has_feature
    158   // define dummy macro for non-clang compilers
    159   #define __has_feature(x) 0
    160 #endif
    161 
    162 #if __has_feature(attribute_unused_on_fields)
    163 #define gcc_unused_field gcc_unused
    164 #else
    165 #define gcc_unused_field
    166 #endif
    167 
    168 #if defined(__GNUC__) || defined(__clang__)
    169 #define gcc_unreachable() __builtin_unreachable()
    170 #else
    171 #define gcc_unreachable()
    172 #endif
    173 
    174 #endif