diff options
Diffstat (limited to 'utils/utils.h')
| -rw-r--r-- | utils/utils.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/utils/utils.h b/utils/utils.h index 3995071cd..cb9e04b45 100644 --- a/utils/utils.h +++ b/utils/utils.h @@ -89,4 +89,31 @@ */ bool is_dir(const char *path); +/** + * switch fall through + */ +#if defined __cplusplus && defined __has_cpp_attribute + #if __has_cpp_attribute(fallthrough) && __cplusplus >= __has_cpp_attribute(fallthrough) + #define fallthrough [[fallthrough]] + #elif __has_cpp_attribute(gnu::fallthrough) && __STDC_VERSION__ >= __has_cpp_attribute(gnu::fallthrough) + #define fallthrough [[gnu::fallthrough]] + #elif __has_cpp_attribute(clang::fallthrough) && __STDC_VERSION__ >= __has_cpp_attribute(clang::fallthrough) + #define fallthrough [[clang::fallthrough]] + #endif +#elif defined __STDC_VERSION__ && defined __has_c_attribute + #if __has_c_attribute(fallthrough) && __STDC_VERSION__ >= __has_c_attribute(fallthrough) + #define fallthrough [[fallthrough]] + #endif +#endif +#if !defined fallthrough && defined __has_attribute + #if __has_attribute(__fallthrough__) + #define fallthrough __attribute__((__fallthrough__)) + #endif +#endif +#if !defined fallthrough +/* early gcc and clang have no implicit fallthrough warning */ + #define fallthrough do {} while(0) +#endif + + #endif |