--- libev/ev.c.orig 2015-01-07 13:54:19.000000000 +0100 +++ libev/ev.c 2015-03-02 20:39:18.150956000 +0100 @@ -1022,12 +1022,12 @@ } #endif -#if ECB_GCC_VERSION(4,5) +#if ECB_GCC_VERSION(4,5) || defined __clang__ #define ecb_unreachable() __builtin_unreachable () #else /* this seems to work fine, but gcc always emits a warning for it :/ */ - ecb_inline void ecb_unreachable (void) ecb_noreturn; - ecb_inline void ecb_unreachable (void) { } + ecb_inline ecb_noreturn void ecb_unreachable (void); + ecb_inline ecb_noreturn void ecb_unreachable (void) { } #endif /* try to tell the compiler that some condition is definitely true */