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linker error ".... already defined in xxxx"

Hello,

I'm trying to compile a program but it gives an error like below:

Executing: ""C:\Rhapsody752\Share"\etc\msvc9make.bat deneme.mak build "
Setting environment for using Microsoft Visual Studio 2008 x86 tools.
The filename, directory name, or volume label syntax is incorrect.
Building library deneme.dll msvcprt.lib(MSVCP90.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::~basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(void)" (??1?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in OpcServer.obj

I added OpcServer.obj from another project. What's the problem here?
Could you help me please?

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evilrix

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SOLUTION

phoffric

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phoffric

Do you have the source code so that you can compile it along with the rest of your project?

evilrix

>> The error is a multiply defined symbol located in OpcServer.obj.

Note that the symbol is ~basic_string, suggesting mixed CRT

vileda

ASKER

I compiled my main program with /MT option and my libray OPCServer.obj with /MD option. I don't have any idea about how it worked but It worked.

evilrix

>> I don't have any idea about how it worked but It worked.

are you saying that resolve it? I suspect that it's not really since you are still using two different C runtimes.

MT: Multithreaded, static link
MD: Multithreaded, dynamic link (import library for MSVCR80.DLL). Be aware that if you use the Standard C++ Library, your program will need MSVCP80.DLL to run.

You should should the same C runtime otherwise you will (potentially) get undefined behaviour.

vileda

ASKER

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linker error &quot;.... already defined in xxxx&quot;

linker error ".... already defined in xxxx"