id summary reporter owner description type status milestone component version severity resolution keywords cc 12201 Compilation issue in 64 bit rabindra@… viboes "when compiling my project in 64 bit with Boost, It is showing error message in libboost_thread-vc90-mt-1_60.lib {{{ Error 696 error LNK2005: ""public: virtual __cdecl boost::detail::thread_data_base::~thread_data_base(void)"" (??1thread_data_base@detail@boost@@UEAA@XZ) already defined in xxxx.obj libboost_thread-vc90-mt-1_60.lib Error 697 error LNK2001: unresolved external symbol ""private: void __cdecl boost::thread::start_thread(void)"" (?start_thread@thread@boost@@AEAAXXZ) xxxx.obj Error 698 error LNK2001: unresolved external symbol ""public: void __cdecl boost::thread::join(void)"" (?join@thread@boost@@QEAAXXZ) xxxx.obj }}} where xxxx is my class for boost use" Support Requests closed To Be Determined thread Boost 1.60.0 Problem worksforme