Re: Problem linking boost::threads using MSVC6 SP4

--- In Boost-Users@y..., "gunnarnl" wrote:

I've created a windows console project with VC++ 6.0 and just used one of the examples in the documentation. I've also added the BOOST_HAS_THREADS macro in the settings. The program compiles well in debug mode but gives the following linking errors:

You shouldn't add BOOST_HAS_THREADS. This will be set for you by the config headers if you've linked against the multi-threaded runtime libraries.

Compiling... main.cpp Linking... msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: virtual __thiscall std::runtime_error::~runtime_error(void)" (?? 1runtime_error@std@@UAE@XZ) already defined in main.obj msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::runtime_error::runtime_error(class runtime_error::runtime_error const &)" (??0runtime_error@std@@QAE@ABV01@@Z) already defined in main.obj msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::basic_string::~basic_string(void)" (??1? $basic_strin g@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in main.obj msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::runtime_error::runtime_error(class runtime_error::basic_string const &)" (??0runtime_error@std@@QAE@ABV? $basic_strin g@DU?$char_traits@D@std@@V?$allocator@D@2@@1@@Z) already defined in libcpmtd.lib(ios.obj) msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::basic_string::basic_string(char const *,class basic_ string

...

::allocator<char> const &)" (??0?$basic_string@DU? $char_traits@D@std@@V?$allocator@D@2@@std@@QAE@PBDABV? $allocator@D@1@@Z) already defined in main.obj LINK : warning LNK4098: defaultlib "MSVCRTD" conflicts with use of other libs; use /NODEFAULTLIB:library Debug/threads.exe : fatal error LNK1169: one or more multiply defined symbols found Error executing link.exe.

Link errors like this are an indication that both the DLL and the LIB version of the C RTL have been linked into your application. If you are using the last release of Boost Jam built only libraries that link against the DLL version of the C RTL and you should do the same in your application (Project | Settings | C/C++ | Code Generation | Use run-time library | (Debug) Multithreaded DLL). The current CVS Jamfiles will build libraries that link against both the DLL and the LIB version of the C RTL so you'll be able to choose which to link against with your own applications, but you'll need to insure you link against the correct libboost_thread.lib in that case.

Any help on this would be appreciated.

Hope that helped. Bill Kempf