/in/foo.c: In function 'S':
/in/foo.c:14:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/in/foo.c: In function 'X':
/in/foo.c:26:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^