https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53232
--- Comment #18 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> --- (In reply to Jakub Jelinek from comment #17) > Yeah, but warnings with high false positivity rates at least shouldn't be in > -Wall. Well, there already is -Wunused, which is included in -Wall (such warnings may typically be emitted due to #if and also in temporary code when debugging), and -Wsign-compare in C++. Anyway, there is a first issue: the warning is inexistent, even with -Wextra. There is a second issue: the warning is not emitted with -Wreturn-type when there is a call to main(). Solving these two issues alone would not yield a high false positivity rate with -Wall. (That said, I think that developers should be encouraged to have an explicit "return" for main(); in particular, this is really easy to do and improves the code readability, specially knowing the difference of behavior with other languages, such as shell scripts and Perl.)
