https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86134
--- Comment #4 from rguenther at suse dot de <rguenther at suse dot de> --- On Wed, 13 Jun 2018, msebor at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86134 > > --- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> --- > As per the recent discussion: > https://gcc.gnu.org/ml/gcc-patches/2018-06/msg00422.html But the warning should never be elided to an error with -Werror. > echo 'int main(){}' | gcc -S -x c -Wno-unknown-warning-option -Wall -Werror -Wno-error=return-type - <stdin>: In function ‘main’: <stdin>:1:1: warning: control reaches end of non-void function [-Wreturn-type] <stdin>: At top level: cc1: error: unrecognized command line option "-Wno-unknown-warning-option" [-Werror] cc1: all warnings being treated as errors fails the compile but with the warning not emitted the error isn't emitted. Also we do know the warning is guarded by -Wreturn-type so I see no point in warning that it wasn't silenced by -Wno-unknown-warning-option?
