[Bug c/82922] Request: add -Wstrict-prototypes to -Wextra as K&R style is obsolescent

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82922

--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Incremental patch for the testsuite:
https://gcc.gnu.org/ml/gcc-patches/2018-01/msg00962.html

Unfortunately it sounds like it might be too late to enable the option in GCC
8.