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Merge pull request #23542 from medhefgo/attributes

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meson: Document why -Wimplicit-fallthrough is not used with clang
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Yu Watanabe 2022-05-30 04:07:41 +09:00 committed by GitHub
commit ba780ccd5f
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3 changed files with 35 additions and 31 deletions
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3
meson.build
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@ -351,6 +351,9 @@ possible_common_cc_flags = [
'-Werror=shift-overflow=2',
'-Werror=undef',
'-Wfloat-equal',
# gperf prevents us from enabling this because it does not emit fallthrough
# attribute with clang.
#'-Wimplicit-fallthrough',
'-Wimplicit-fallthrough=5',
'-Winit-self',
'-Wlogical-op',

18
src/basic/macro.h
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@ -11,24 +11,6 @@
#include "macro-fundamental.h"
#define _printf_(a, b) __attribute__((__format__(printf, a, b)))
#ifdef __clang__
# define _alloc_(...)
#else
# define _alloc_(...) __attribute__((__alloc_size__(__VA_ARGS__)))
#endif
#define _sentinel_ __attribute__((__sentinel__))
#define _destructor_ __attribute__((__destructor__))
#define _deprecated_ __attribute__((__deprecated__))
#define _malloc_ __attribute__((__malloc__))
#define _weak_ __attribute__((__weak__))
#define _public_ __attribute__((__visibility__("default")))
#define _hidden_ __attribute__((__visibility__("hidden")))
#define _weakref_(x) __attribute__((__weakref__(#x)))
#define _alignas_(x) __attribute__((__aligned__(__alignof__(x))))
#define _alignptr_ __attribute__((__aligned__(sizeof(void*))))
#define _warn_unused_result_ __attribute__((__warn_unused_result__))
#if !defined(HAS_FEATURE_MEMORY_SANITIZER)
# if defined(__has_feature)
# if __has_feature(memory_sanitizer)

45
src/fundamental/macro-fundamental.h
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@ -10,22 +10,41 @@
#include "types-fundamental.h"
#define _align_(x) __attribute__((__aligned__(x)))
#define _const_ __attribute__((__const__))
#define _pure_ __attribute__((__pure__))
#define _section_(x) __attribute__((__section__(x)))
#define _packed_ __attribute__((__packed__))
#define _retain_ __attribute__((__retain__))
#define _used_ __attribute__((__used__))
#define _unused_ __attribute__((__unused__))
#define _alignas_(x) __attribute__((__aligned__(__alignof__(x))))
#define _alignptr_ __attribute__((__aligned__(sizeof(void *))))
#define _cleanup_(x) __attribute__((__cleanup__(x)))
#define _const_ __attribute__((__const__))
#define _deprecated_ __attribute__((__deprecated__))
#define _destructor_ __attribute__((__destructor__))
#define _hidden_ __attribute__((__visibility__("hidden")))
#define _likely_(x) (__builtin_expect(!!(x), 1))
#define _unlikely_(x) (__builtin_expect(!!(x), 0))
#if __GNUC__ >= 7
#define _fallthrough_ __attribute__((__fallthrough__))
#else
#define _fallthrough_
#endif
#define _malloc_ __attribute__((__malloc__))
#define _noreturn_ _Noreturn
#define _packed_ __attribute__((__packed__))
#define _printf_(a, b) __attribute__((__format__(printf, a, b)))
#define _public_ __attribute__((__visibility__("default")))
#define _pure_ __attribute__((__pure__))
#define _retain_ __attribute__((__retain__))
#define _section_(x) __attribute__((__section__(x)))
#define _sentinel_ __attribute__((__sentinel__))
#define _unlikely_(x) (__builtin_expect(!!(x), 0))
#define _unused_ __attribute__((__unused__))
#define _used_ __attribute__((__used__))
#define _warn_unused_result_ __attribute__((__warn_unused_result__))
#define _weak_ __attribute__((__weak__))
#define _weakref_(x) __attribute__((__weakref__(#x)))
#ifdef __clang__
# define _alloc_(...)
#else
# define _alloc_(...) __attribute__((__alloc_size__(__VA_ARGS__)))
#endif
#if __GNUC__ >= 7 || __clang__
# define _fallthrough_ __attribute__((__fallthrough__))
#else
# define _fallthrough_
#endif
#define XSTRINGIFY(x) #x
#define STRINGIFY(x) XSTRINGIFY(x)