Also unify warning options across Clang and GCC and fix minor issues that was surfaced by this. PiperOrigin-RevId: 508619655 Change-Id: I59b777bf2dfea4422485670e2427c7d3f5cf6405
PiperOrigin-RevId: 450374687 Change-Id: Ie3225a46ce095fc28ae8e63c326a640261f562bb