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The subject says it all. Consider int i; // <<-- not highlighted int main() { int j; // <<-- highlighted return 0; } The performance challenge here is clear, but users expectations are set high by the presence of the feature.
the behavior is consistent with Java: - public fields are not tracked for used/not_used, only local ones this is responsibility of FindBugs/C++ Audits
I think, it is one of audits => ENH