Also unify warning options across Clang and GCC and fix minor issues that was surfaced by this.
PiperOrigin-RevId: 508619655
Change-Id: I59b777bf2dfea4422485670e2427c7d3f5cf6405
Also make minor modifications to Python bindings code for GCC compatibility.
Fixes#191.
PiperOrigin-RevId: 435127640
Change-Id: I8bd3a35bbb2724a24341072ba8df3da4372f83d3