https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104711
--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> --- Arnd's request was to not have -Wshift-negative-value implied by -W, or at least not if -fwrapv (-pedantic would be wrong btw, the standard does not require a diagnostic here, and that is what -pedantic does / is for). My opinion is it does not belong in -W at all. X << 0 is undefined behaviour for negative X (in C. This whole PR is about C). > I suppose you are asking for an option to turn all left shifts into logical > shifts? The request is to not warn for left shift of a negative number with -W. It is fine to do that with -Wshift-negative-value, but that option should not be implied by -W.
