https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81582
--- Comment #7 from Georg-Johann Lay <gjl at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #6) > If you are preprocessing without -C and without -fdirectives-only, then > comments are gone, so you really can't use them to inhibit the warning. Yes, so -Wimplicit-fallthrough is really fragile. And the information is obviously available somewhere[tm] as the diagnostic displays it, adding even more confusion. This might all be acceptable if -Wimplicit-fallthrough had to be enabled by hand, but it is enabled per default with -W (and yes, I know that's documented). It's still questionable to have such stuff enabled per default given its fragility. I am understanding all this from a GCC internal development perspective, but not when I am taking the perspective of an ordinary user.
