Hello, the following stripped down code builds fine under 32bit platform but fails with lot of linker errors on the 64bit platform. Compiler is VS2005. I diagnosed the link procedure and found that my 64bit version of libboost_serialization-vc80-mt-1_42.lib is found and tried to link Does anybody know what I am doing wrong? Thank you in advance! -------------------------------------------- #include <boost/archive/xml_oarchive.hpp> #include <fstream> #include "boost/serialization/vector.hpp" #include "boost/serialization/set.hpp" #include "boost/serialization/utility.hpp" struct A_STRUCT { double mBlub; int saveXMLConfig() const { std::ofstream ofs("file", std::ios::binary); boost::archive::xml_oarchive oa(ofs); oa << boost::serialization::make_nvp("A_STRUCT", *this); return 0; } void save(boost::archive::xml_oarchive& ar, const unsigned int) const { ar & boost::serialization::make_nvp("mBlub", mBlub); } BOOST_SERIALIZATION_SPLIT_MEMBER() }; int main(){} -------------------------------------------- The build output: -------------------------------------------- 1>------ Build started: Project: test, Configuration: Debug x64 ------ 1>Compiling... 1>main.cpp 1>Linking to lib file: libboost_serialization-vc80-mt-gd-1_42.lib 1>Linking to lib file: libboost_serialization-vc80-mt-gd-1_42.lib 1>Linking to lib file: libboost_serialization-vc80-mt-gd-1_42.lib 1>Linking... 1> Creating library D:\Simulation\test\test\x64\Debug\test.lib and object D:\Simulation\test\test\x64\Debug\test.exp 1>main.obj : error LNK2019: unresolved external symbol "protected: __cdecl boost::archive::detail::basic_oserializer::basic_oserializer(class boost::serialization::extended_type_info const &)" (??0basic_oserializer@detail@archive@boost@@IEAA@AEBVextended_type_info@serialization@3@@Z) referenced in function "public: __cdecl boost::archive::detail::oserializer<class boost::archive::xml_oarchive,struct A_STRUCT>::oserializer<class boost::archive::xml_oarchive,struct A_STRUCT>(void)" (??0?$oserializer@Vxml_oarchive@archive@boost@@UA_STRUCT@@@detail@archive@boost@@QEAA@XZ) 1>main.obj : error LNK2019: unresolved external symbol "protected: __cdecl boost::archive::detail::basic_oserializer::~basic_oserializer(void)" (??1basic_oserializer@detail@archive@boost@@IEAA@XZ) referenced in function "public: virtual __cdecl boost::archive::detail::oserializer<class boost::archive::xml_oarchive,struct A_STRUCT>::~oserializer<class boost::archive::xml_oarchive,struct A_STRUCT>(void)" (??1?$oserializer@Vxml_oarchive@archive@boost@@UA_STRUCT@@@detail@archive@boost@@UEAA@XZ) 1>main.obj : error LNK2001: unresolved external symbol "public: virtual bool __cdecl boost::serialization::typeid_system::extended_type_info_typeid_0::is_less_than(class boost::serialization::extended_type_info const &)const " (?is_less_than@extended_type_info_typeid_0@typeid_system@serialization@boost@@UEBA_NAEBVextended_type_info@34@@Z) 1>main.obj : error LNK2001: unresolved external symbol "public: virtual bool __cdecl boost::serialization::typeid_system::extended_type_info_typeid_0::is_equal(class boost::serialization::extended_type_info const &)const " (?is_equal@extended_type_info_typeid_0@typeid_system@serialization@boost@@UEBA_NAEBVextended_type_info@34@@Z) 1>main.obj : error LNK2019: unresolved external symbol "protected: __cdecl boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0(void)" (??1extended_type_info_typeid_0@typeid_system@serialization@boost@@IEAA@XZ) referenced in function "int `public: __cdecl boost::serialization::extended_type_info_typeid<struct A_STRUCT>::extended_type_info_typeid<struct A_STRUCT>(void)'::`1'::dtor$0" (?dtor$0@?0???0?$extended_type_info_typeid@UA_STRUCT@@@serialization@boost@@QEAA@XZ@4HA) 1>main.obj : error LNK2019: unresolved external symbol "protected: void __cdecl boost::serialization::extended_type_info::key_register(void)const " (?key_register@extended_type_info@serialization@boost@@IEBAXXZ) referenced in function "public: __cdecl boost::serialization::extended_type_info_typeid<struct A_STRUCT>::extended_type_info_typeid<struct A_STRUCT>(void)" (??0?$extended_type_info_typeid@UA_STRUCT@@@serialization@boost@@QEAA@XZ) 1>main.obj : error LNK2019: unresolved external symbol "protected: void __cdecl boost::serialization::typeid_system::extended_type_info_typeid_0::type_register(class type_info const &)" (?type_register@extended_type_info_typeid_0@typeid_system@serialization@boost@@IEAAXAEBVtype_info@@@Z) referenced in function "public: __cdecl boost::serialization::extended_type_info_typeid<struct A_STRUCT>::extended_type_info_typeid<struct A_STRUCT>(void)" (??0?$extended_type_info_typeid@UA_STRUCT@@@serialization@boost@@QEAA@XZ) 1>main.obj : error LNK2019: unresolved external symbol "protected: __cdecl boost::serialization::typeid_system::extended_type_info_typeid_0::extended_type_info_typeid_0(char const *)" (??0extended_type_info_typeid_0@typeid_system@serialization@boost@@IEAA@PEBD@Z) referenced in function "public: __cdecl boost::serialization::extended_type_info_typeid<struct A_STRUCT>::extended_type_info_typeid<struct A_STRUCT>(void)" (??0?$extended_type_info_typeid@UA_STRUCT@@@serialization@boost@@QEAA@XZ) 1>main.obj : error LNK2019: unresolved external symbol "protected: void __cdecl boost::archive::basic_xml_oarchive<class boost::archive::xml_oarchive>::save_end(char const *)" (?save_end@?$basic_xml_oarchive@Vxml_oarchive@archive@boost@@@archive@boost@@IEAAXPEBD@Z) referenced in function "protected: void __cdecl boost::archive::basic_xml_oarchive<class boost::archive::xml_oarchive>::save_override<double const >(struct boost::serialization::nvp<double const > const &,int)" (??$save_override@$$CBN@?$basic_xml_oarchive@Vxml_oarchive@archive@boost@@@archive@boost@@IEAAXAEBU?$nvp@$$CBN@serialization@2@H@Z) 1>main.obj : error LNK2019: unresolved external symbol "protected: void __cdecl boost::archive::basic_xml_oarchive<class boost::archive::xml_oarchive>::save_start(char const *)" (?save_start@?$basic_xml_oarchive@Vxml_oarchive@archive@boost@@@archive@boost@@IEAAXPEBD@Z) referenced in function "protected: void __cdecl boost::archive::basic_xml_oarchive<class boost::archive::xml_oarchive>::save_override<double const >(struct boost::serialization::nvp<double const > const &,int)" (??$save_override@$$CBN@?$basic_xml_oarchive@Vxml_oarchive@archive@boost@@@archive@boost@@IEAAXAEBU?$nvp@$$CBN@serialization@2@H@Z) 1>main.obj : error LNK2019: unresolved external symbol "protected: void __cdecl boost::archive::basic_xml_oarchive<class boost::archive::xml_oarchive>::end_preamble(void)" (?end_preamble@?$basic_xml_oarchive@Vxml_oarchive@archive@boost@@@archive@boost@@IEAAXXZ) referenced in function "public: static void __cdecl boost::archive::save_access::save_primitive<class boost::archive::xml_oarchive,double>(class boost::archive::xml_oarchive &,double const &)" (??$save_primitive@Vxml_oarchive@archive@boost@@N@save_access@archive@boost@@SAXAEAVxml_oarchive@12@AEBN@Z) 1>main.obj : error LNK2019: unresolved external symbol "public: __cdecl boost::archive::archive_exception::archive_exception(enum boost::archive::archive_exception::_exception_code,char const *,char const *)" (??0archive_exception@archive@boost@@QEAA@W4_exception_code@012@PEBD1@Z) referenced in function "public: void __cdecl boost::archive::basic_text_oprimitive<class std::basic_ostream<char,struct std::char_traits<char> > >::save(double)" (?save@?$basic_text_oprimitive@V?$basic_ostream@DU?$char_traits@D@std@@@std@@@archive@boost@@QEAAXN@Z) 1>main.obj : error LNK2019: unresolved external symbol "public: virtual __cdecl boost::archive::archive_exception::~archive_exception(void)" (??1archive_exception@archive@boost@@UEAA@XZ) referenced in function "public: void __cdecl boost::archive::archive_exception::`vbase destructor'(void)" (??_Darchive_exception@archive@boost@@QEAAXXZ) 1>main.obj : error LNK2019: unresolved external symbol "public: virtual char const * __cdecl boost::archive::archive_exception::what(void)const " (?what@archive_exception@archive@boost@@UEBAPEBDXZ) referenced in function "[thunk]:public: virtual char const * __cdecl boost::archive::archive_exception::what`vtordisp{4294967292,0}' (void)const " (?what@archive_exception@archive@boost@@$4PPPPPPPM@A@EBAPEBDXZ) 1>main.obj : error LNK2019: unresolved external symbol "protected: void __cdecl boost::serialization::typeid_system::extended_type_info_typeid_0::type_unregister(void)" (?type_unregister@extended_type_info_typeid_0@typeid_system@serialization@boost@@IEAAXXZ) referenced in function "public: __cdecl boost::serialization::extended_type_info_typeid<struct A_STRUCT>::~extended_type_info_typeid<struct A_STRUCT>(void)" (??1?$extended_type_info_typeid@UA_STRUCT@@@serialization@boost@@QEAA@XZ) 1>main.obj : error LNK2019: unresolved external symbol "protected: void __cdecl boost::serialization::extended_type_info::key_unregister(void)const " (?key_unregister@extended_type_info@serialization@boost@@IEBAXXZ) referenced in function "public: __cdecl boost::serialization::extended_type_info_typeid<struct A_STRUCT>::~extended_type_info_typeid<struct A_STRUCT>(void)" (??1?$extended_type_info_typeid@UA_STRUCT@@@serialization@boost@@QEAA@XZ) 1>D:\Simulation\test\test\x64\Debug\test.exe : fatal error LNK1120: 16 unresolved externals 1>Build log was saved at "file://d:\Simulation\test\test\test\x64\Debug\BuildLog.htm" 1>test - 17 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== --------------------------------------------