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23 #define GCC_MAKE_VERSION(major, minor, patchlevel) ((major) * 10000 + (minor) * 100 + patchlevel)
26 #define GCC_VERSION GCC_MAKE_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
31 #define GCC_CHECK_VERSION(major, minor) \
32 (defined(__GNUC__) && GCC_VERSION >= GCC_MAKE_VERSION(major, minor, 0))
38 #define GCC_OLDER_THAN(major, minor) \
39 (defined(__GNUC__) && !defined(__clang__) && \
40 GCC_VERSION < GCC_MAKE_VERSION(major, minor, 0))
43 # define CLANG_VERSION GCC_MAKE_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__)
44 # if __clang_major__ < 3
45 # error Sorry, your clang version is too old. You need at least version 3.1.
47 #elif defined(__GNUC__)
48 # if GCC_OLDER_THAN(4,6)
49 # error Sorry, your gcc version is too old. You need at least version 4.6.
52 # warning Untested compiler. Use at your own risk!
58 #define CLANG_CHECK_VERSION(major, minor) \
59 (defined(__clang__) && \
60 CLANG_VERSION >= GCC_MAKE_VERSION(major, minor, 0))
62 #if GCC_CHECK_VERSION(4,0)
66 #define gcc_const __attribute__((const))
67 #define gcc_deprecated __attribute__((deprecated))
68 #define gcc_may_alias __attribute__((may_alias))
69 #define gcc_malloc __attribute__((malloc))
70 #define gcc_noreturn __attribute__((noreturn))
71 #define gcc_packed __attribute__((packed))
72 #define gcc_printf(a,b) __attribute__((format(printf, a, b)))
73 #define gcc_pure __attribute__((pure))
74 #define gcc_sentinel __attribute__((sentinel))
75 #define gcc_unused __attribute__((unused))
76 #define gcc_warn_unused_result __attribute__((warn_unused_result))
78 #define gcc_nonnull(...) __attribute__((nonnull(__VA_ARGS__)))
79 #define gcc_nonnull_all __attribute__((nonnull))
81 #define gcc_likely(x) __builtin_expect (!!(x), 1)
82 #define gcc_unlikely(x) __builtin_expect (!!(x), 0)
84 #define gcc_aligned(n) __attribute__((aligned(n)))
86 #define gcc_visibility_hidden __attribute__((visibility("hidden")))
87 #define gcc_visibility_default __attribute__((visibility("default")))
89 #define gcc_always_inline __attribute__((always_inline))
96 #define gcc_deprecated
101 #define gcc_printf(a,b)
105 #define gcc_warn_unused_result
107 #define gcc_nonnull(...)
108 #define gcc_nonnull_all
110 #define gcc_likely(x) (x)
111 #define gcc_unlikely(x) (x)
113 #define gcc_aligned(n)
115 #define gcc_visibility_hidden
116 #define gcc_visibility_default
118 #define gcc_always_inline inline
122 #if GCC_CHECK_VERSION(4,3)
124 #define gcc_hot __attribute__((hot))
125 #define gcc_cold __attribute__((cold))
134 #if GCC_CHECK_VERSION(4,6) && !defined(__clang__)
135 #define gcc_flatten __attribute__((flatten))
142 #define gcc_restrict restrict
143 #elif GCC_CHECK_VERSION(4,0)
145 #define gcc_restrict __restrict__
153 #if defined(__cplusplus)
156 #if GCC_OLDER_THAN(4,7)
161 #if defined(__clang__) || GCC_CHECK_VERSION(4,8)
162 #define gcc_alignas(T, fallback) alignas(T)
164 #define gcc_alignas(T, fallback) gcc_aligned(fallback)
169 #ifndef __has_feature
171 #define __has_feature(x) 0
174 #if __has_feature(attribute_unused_on_fields)
175 #define gcc_unused_field gcc_unused
177 #define gcc_unused_field
180 #if defined(__GNUC__) || defined(__clang__)
181 #define gcc_unreachable() __builtin_unreachable()
183 #define gcc_unreachable()