So the library is failing to build for all mngw platforms. Unfortunately, the test matrix truncates the error messages due to a large number of warnings on that plaform before any actual error message is displayed. This makes it impossible to make the library work on this plaform. This an ongoing problem which I've complained before - alas without getting anyone to take action.
I'm pretty sure I've posted these before, but here are the serialization build/linker errors I see locally: gcc.link.dll ..\..\..\bin.v2\libs\serialization\build\gcc-mingw-5.3.0s11\debug\libboost_serialization-mgw53-d-1_62.dll.a ..\..\..\bin.v2\libs\serialization\build\gcc-mingw-5.3.0s11\debug\binary_iarchive.o: In function `boost::serialization::singleton<boost::archive::detail::extra_ detail::map<boost::archive::binary_iarchive> >::get_mutable_instance()': M:\data\boost\boost\libs\serialization\test/../../../boost/serialization/singleton.hpp:131: undefined reference to `__imp__ZN5boost13serialization16singleton_module9is_lockedEv' ..\..\..\bin.v2\libs\serialization\build\gcc-mingw-5.3.0s11\debug\binary_oarchive.o: In function `boost::serialization::singleton<boost::archive::detail::extra_detail::map<boost::archive::binary_oarchive>
::get_mutable_instance()': M:\data\boost\boost\libs\serialization\test/../../../boost/serialization/singleton.hpp:131: undefined reference to `__imp__ZN5boost13serialization16singleton_module9is_lockedEv' ..\..\..\bin.v2\libs\serialization\build\gcc-mingw-5.3.0s11\debug\polymorphic_iarchive.o: In function `boost::serialization::singleton<boost::archive::detail::extra_detail::map<boost::archive::polymorphic_iarchive> ::get_mutable_instance() ': M:\data\boost\boost\libs\serialization\test/../../../boost/serialization/singleton.hpp:131: undefined reference to `__imp__ZN5boost13serialization16singleton_module9is_lockedEv' ..\..\..\bin.v2\libs\serialization\build\gcc-mingw-5.3.0s11\debug\polymorphic_oarchive.o: In function `boost::serialization::singleton<boost::archive::detail::extra_detail::map<boost::archive::polymorphic_oarchive> ::get_mutable_instance()': M:\data\boost\boost\libs\serialization\test/../../../boost/serialization/singleton.hpp:131: undefined reference to `__imp__ZN5boost13serialization16singleton_module9is_lockedEv' ..\..\..\bin.v2\libs\serialization\build\gcc-mingw-5.3.0s11\debug\text_iarchive.o: In function `boost::serialization::singleton<boost::archive::detail::extra_detail::map<boost::archive::text_iarchive> ::get_mutable_instance()': M:\data\boost\boost\libs\serialization\test/../../../boost/serialization/singleton.hpp:131: undefined reference to `__imp__ZN5boost13serialization16singleton_module9is_lockedEv' ..\..\..\bin.v2\libs\serialization\build\gcc-mingw-5.3.0s11\debug\text_oarchive.o:M:\data\boost\boost\libs\serialization\test/../../../boost/serialization/singleton.hpp:131: more undefined references to `__imp__ZN5boost13serialization16singleton_module9is_lockedEv' follow
collect2.exe: error: ld returned 1 exit status
John.