Most of the failing libstdc++ tests which shouldn't be platform-dependent fail with this message: sh: /usr/bin/stty: Bad address
libstdc++-v3/config/os/mingw32/error_constants.h is missing several entries, causing failures in the 19_diagnostics tests. There are a few failures in 23_containers/vector/ext_pointer which might be caused by an inttype definition on the platform, I'm not sure. A bugzilla PR should probably be opened if there isn't one already.
