__builtin_unreachable appeared in gcc 4.5.0
__builtin_unreachable appeared in gcc 4.5.0

koba-e964/picrin,leavesbnw/picrin,dcurrie/picrin,picrin-scheme/picrin,omasanori/picrin,picrin-scheme/picrin,leavesbnw/picrin,ktakashi/picrin,leavesbnw/picrin,koba-e964/picrin,omasanori/picrin,dcurrie/picrin,ktakashi/picrin,koba-e964/picrin,ktakashi/picrin