http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53232
--- Comment #5 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> 2012-05-04 15:44:04 UTC --- (In reply to comment #4) > IMHO this isn't a bug because in C99 it's well-defined what happens if you > fall > off the end of main, Only at program termination (if my interpretation of C99 is correct). Please read again the bug report and the links. > so it would annoy people to issue a warning on perfectly valid code > whenever -Wall is enabled. Well, GCC has various warnings on perfectly valid code, just because the code is suspicious. This is the case here too. And there are potential portability problems (not everyone may use a C99 compiler). So, good reasons to issue a warning.
