https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94247
--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> --- (In reply to Jakub Jelinek from comment #6) > No, it diagnoses the main bug Nope, it does not. -Wchar-subscripts is designed and documented to diagnose a common cause of a bug. The actual bug itself (which, as noted in pr94182, the manual neglects to describe) is in inadvertently using a negative index as a result of sign extension when a positive index is intended. When that cannot happen there is obviously no bug to diagnose. There's no doubt that there is room for improvement in both warnings. Some of the false negatives might be avoidable by enhancing -Wchar-subscripts in the front-end (e.g., fixing the remainder of pr29455), but the better ROI is in continuing to improve -Warray-bounds (pr56456).
