[Eiwatah4]

Gcc doesn't have such a warning. Clang has it, but it has to be explicitly enabled. (It's not even in -Wall or -Wextra.)

[throwaway2048]

It appears that -Wunreachable-code was removed from gcc due to optimizer issues

http://gcc.gnu.org/ml/gcc-help/2011-05/msg00360.html