In mingwrt-3.x, the .def files from which the various libmsvcr*.a
are generated incorporated version specific filters, ensuring that the respective import libraries would expose only those symbols which are expected to be exported by their associated DLLs. WSL-4 has discarded these filters, making the effective export lists for all libmsvcr*.a
identical; (the only exception being the addition of the _get_output_format()
stub, to those import libraries which are associated with DLLs which are known to lack that function).
This, surely, cannot be considered to be an appropriate implementation.