GRPC is throwing a bunch of warnings in --config=opt, ex:

src/third_party/grpc/dist/src/core/lib/iomgr/exec_ctx.h:331:25: warning: storing the address of local variable 'callback_exec_ctx' in 'grpc_core::ApplicationCallbackExecCtx::callback_exec_ctx_' [-Wdangling-pointer=]

Silence these warnings since they're very noisy and hide other warnings that may pop up in user code