https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92110
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> --- The __builtin_warning patch implements the per-location solution (https://gcc.gnu.org/ml/gcc-patches/2019-10/msg01015.html) but I think the more aggregate approach would be more informative and so preferable.
