https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93926
Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |patch --- Comment #5 from Martin Sebor <msebor at gcc dot gnu.org> --- Patch: https://gcc.gnu.org/ml/gcc-patches/2020-02/msg01586.html I think it should still handle gracefully the benign mismatches you highlighted, Joseph. The gcc.dg/Wbuiltin-declaration-mismatch-[67].c pair of tests make sure the stdio functions' signatures match whatever type is declared in the headers so hopefully they adequately cover those cases.