Linker error using MFC and STL

[Jambolo]

I have a non-MFC project using std::string that is compiled into a library (Confetti.lib). My main project is an MFC project that uses this library. I get the following linker errors: msvcprtd.lib(MSVCP70D.dll) : error LNK2005: "public: __thiscall std::basic_string::~basic_string(void)" (??1?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in Confetti.lib(ParticleSystem.obj) msvcprtd.lib(MSVCP70D.dll) : error LNK2005: "public: __thiscall std::basic_string::basic_string(char const *)" (??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@PBD@Z) already defined in Confetti.lib(ParticleSystem.obj) Can anyone tell me why this is happening and how to fix it? Also, if I ignore msvcprtd.lib, then I get lots of dll import/export errors for std::basic_string.

[Steve S]

What's your code generation for both? Multithreaded, singlethreaded, dll, etc? Steve S

[Jambolo]

Both are multithreaded. However, I found that linking with the MFC DLL causes linker errors, and linking statically does not. My guess is that for some weird reason (a bug?), the MFC DLLs export some STL symbols.