Hi, I am in the progress of upgrading a project from boost 1.34.0 to 1.35.0. As far as I can see no changes have been made to the Serialization library. But I am having trouble with it. -I build boost using ./configure and using the with-libraries option to built the serialization library, besides others as a shared library -I am using g++ 4.2.3 on Ubuntu 8.04 Using BOOST_CLASS_EXPORT_GUID I am making my classes known to the serialization library. For serialization I am using boost::archive::polymorphic_binary_oarchive. This all worked with 1.34.0. Now I am getting strange linker errors. I do have -lboost_serialization on the linker command. When I uncomment all BOOST_CLASS_EXPORT_GUID commands my compilation works. Following are the linker errors: RemoteMessagingSystem.o: In function `~pointer_iserializer': /home/mayer/SpoVNet/development/spovnet/lib/boost_1_35_0/build/include/boost-1_35/boost/archive/detail/iserializer.hpp:171: undefined reference to `boost::archive::detail::archive_pointer_iserializer<boost::archive::polymorphic_binary_iarchive>::~archive_pointer_iserializer()' RemoteMessagingSystem.o: In function `~pointer_oserializer': /home/mayer/SpoVNet/development/spovnet/lib/boost_1_35_0/build/include/boost-1_35/boost/archive/detail/oserializer.hpp:162: undefined reference to `boost::archive::detail::archive_pointer_oserializer<boost::archive::detail::polymorphic_oarchive_dispatch<boost::archive::binary_oarchive_impl<boost::archive::binary_oarchive, char, std::char_traits<char> > > >::~archive_pointer_oserializer()' RemoteMessagingSystem.o: In function `~pointer_iserializer': /home/mayer/SpoVNet/development/spovnet/lib/boost_1_35_0/build/include/boost-1_35/boost/archive/detail/iserializer.hpp:171: undefined reference to `boost::archive::detail::archive_pointer_iserializer<boost::archive::polymorphic_binary_iarchive>::~archive_pointer_iserializer()' /home/mayer/SpoVNet/development/spovnet/lib/boost_1_35_0/build/include/boost-1_35/boost/archive/detail/iserializer.hpp:171: undefined reference to `boost::archive::detail::archive_pointer_iserializer<boost::archive::polymorphic_binary_iarchive>::~archive_pointer_iserializer()' RemoteMessagingSystem.o: In function `~pointer_oserializer': /home/mayer/SpoVNet/development/spovnet/lib/boost_1_35_0/build/include/boost-1_35/boost/archive/detail/oserializer.hpp:162: undefined reference to `boost::archive::detail::archive_pointer_oserializer<boost::archive::detail::polymorphic_oarchive_dispatch<boost::archive::binary_oarchive_impl<boost::archive::binary_oarchive, char, std::char_traits<char> > > >::~archive_pointer_oserializer()' /home/mayer/SpoVNet/development/spovnet/lib/boost_1_35_0/build/include/boost-1_35/boost/archive/detail/oserializer.hpp:162: undefined reference to `boost::archive::detail::archive_pointer_oserializer<boost::archive::detail::polymorphic_oarchive_dispatch<boost::archive::binary_oarchive_impl<boost::archive::binary_oarchive, char, std::char_traits<char> > > >::~archive_pointer_oserializer()' RemoteMessagingSystem.o: In function `pointer_oserializer': /home/mayer/SpoVNet/development/spovnet/lib/boost_1_35_0/build/include/boost-1_35/boost/archive/detail/oserializer.hpp:214: undefined reference to `boost::archive::detail::archive_pointer_oserializer<boost::archive::detail::polymorphic_oarchive_dispatch<boost::archive::binary_oarchive_impl<boost::archive::binary_oarchive, char, std::char_traits<char> > >

::archive_pointer_oserializer(boost::serialization::extended_type_info const&)' /home/mayer/SpoVNet/development/spovnet/lib/boost_1_35_0/build/include/boost-1_35/boost/archive/detail/oserializer.hpp:224: undefined reference to `boost::archive::detail::archive_pointer_oserializer<boost::archive::detail::polymorphic_oarchive_dispatch<boost::archive::binary_oarchive_impl<boost::archive::binary_oarchive, char, std::char_traits<char> > > >::~archive_pointer_oserializer()' /home/mayer/SpoVNet/development/spovnet/lib/boost_1_35_0/build/include/boost-1_35/boost/archive/detail/oserializer.hpp:214: undefined reference to `boost::archive::detail::archive_pointer_oserializer<boost::archive::detail::polymorphic_oarchive_dispatch<boost::archive::binary_oarchive_impl<boost::archive::binary_oarchive, char, std::char_traits<char> > > ::archive_pointer_oserializer(boost::serialization::extended_type_info const&)' /home/mayer/SpoVNet/development/spovnet/lib/boost_1_35_0/build/include/boost-1_35/boost/archive/detail/oserializer.hpp:224: undefined reference to `boost::archive::detail::archive_pointer_oserializer<boost::archive::detail::polymorphic_oarchive_dispatch<boost::archive::binary_oarchive_impl<boost::archive::binary_oarchive, char, std::char_traits<char> > > >::~archive_pointer_oserializer()' RemoteMessagingSystem.o: In function `pointer_iserializer': /home/mayer/SpoVNet/development/spovnet/lib/boost_1_35_0/build/include/boost-1_35/boost/archive/detail/iserializer.hpp:314: undefined reference to `boost::archive::detail::archive_pointer_iserializer<boost::archive::polymorphic_binary_iarchive>::archive_pointer_iserializer(boost::serialization::extended_type_info const&)' /home/mayer/SpoVNet/development/spovnet/lib/boost_1_35_0/build/include/boost-1_35/boost/archive/detail/iserializer.hpp:323: undefined reference to `boost::archive::detail::archive_pointer_iserializer<boost::archive::polymorphic_binary_iarchive>::~archive_pointer_iserializer()' /home/mayer/SpoVNet/development/spovnet/lib/boost_1_35_0/build/include/boost-1_35/boost/archive/detail/iserializer.hpp:314: undefined reference to `boost::archive::detail::archive_pointer_iserializer<boost::archive::polymorphic_binary_iarchive>::archive_pointer_iserializer(boost::serialization::extended_type_info const&)' /home/mayer/SpoVNet/development/spovnet/lib/boost_1_35_0/build/include/boost-1_35/boost/archive/detail/iserializer.hpp:323: undefined reference to `boost::archive::detail::archive_pointer_iserializer<boost::archive::polymorphic_binary_iarchive>::~archive_pointer_iserializer()'

collect2: ld returned 1 exit status

Any help is appreciated as I am slightly going nuts :) Best regards, Chris