https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82922
--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> --- I posted a GCC 9 patch here: https://gcc.gnu.org/ml/gcc-patches/2018-06/msg00675.html It adds -Wstrict-prototypes to -Wall. Unfortunately, it got derailed by (IMO unsubstantiated) concerns about the impact on some poorly written configure tests. I'll see if I can find the time to adjust the patch to enable the option only with -Wextra and convince the powers that be to accept it into GCC 9.
