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Removing _LIBCPP_DISABLE_UNUSED_STRUCT_WARNINGS from libc++ enables - #9436
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`[[gnu::__warn_unused__]]` on standard library types (such as `std::string` and `std::set`), surfacing `-Wunused-variable` warnings in `//third_party/flatbuffers`. See [upstream LLVM commit](llvm/llvm-project@ab8b037) for reference. Remove unreferenced variable declarations across the code generators and binary annotator whose initializers have no observable side effects. PiperOrigin-RevId: 999136370
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Removing
_LIBCPP_DISABLE_UNUSED_STRUCT_WARNINGSfrom libc++ enables[[gnu::__warn_unused__]]on standard library types (such asstd::stringandstd::set), surfacing-Wunused-variablewarningsin
//third_party/flatbuffers. See upstream LLVM commit for reference.Remove unreferenced variable declarations across the code generators and
binary annotator whose initializers have no observable side effects.