https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71110
David Malcolm <dmalcolm at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED CC| |dmalcolm at gcc dot gnu.org Resolution|--- |FIXED --- Comment #2 from David Malcolm <dmalcolm at gcc dot gnu.org> --- Thanks for filing this bug. We already issue a warning for this within -Wall, via -Wunused-label (since sometime at or before gcc 4.4, I think): test.c: In function ‘main’: test.c:18:3: warning: label ‘case2’ defined but not used [-Wunused-label] case2: ^~~~~ I think that if the user accidentally omits the space between the "case" and the value, they're unlikely to also have a reference to that label name. Marking this one as resolved. Feel free to reopen if I'm missing something here.