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The VAX float and double format does not support NaN, so the std::partial_ordering returned by <=> will never be 'unordered'. We can just use the partial_ordering value as the strong_ordering. libstdc++-v3/ChangeLog: * libsupc++/compare (_Strong_ordering::_S_fp_cmp) [__vax__]: Use <=> comparison.
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.