build: disable warning -Wunreachable-code-break
#15416
Closed
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This warning remains silent in unity builds. Since we're using unity
in CI for most jobs, warnings remain undetected there.
Disable them for all builds to avoid a surprise warning outside our CI.
The issue caught by the warning is useful for a tidy codebase, but
doesn't affect executed code. It was enabled in
84338c4 #12331 (2023-11-15).
llvm source: https://github.com/llvm/llvm-project/blob/fee2953f23bd8a8a71e574e6a8db08033778d3a4/clang/lib/Sema/AnalysisBasedWarnings.cpp#L125-L134
llvm issue: llvm/llvm-project#71046
Follow-up to 7c023c3 #15384