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Linking error caused by mixing MFC and non MFC style code

Posted on 1998-11-17
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Last Modified: 2013-11-20
I've been trying to include a few files such as my own Matrix library with an MFC app. The problem I run into is a linking error caused by two libraries defining the same symbol.

nafxcwd.lib(afxmem.obj) : error LNK2005: "void * __cdecl operator new(unsigned int)" (??2@YAPAXI@Z) already defined in LIBCMTD.lib(new.obj)
nafxcwd.lib(afxmem.obj) : error LNK2005: "void __cdecl operator delete(void *)" (??3@YAXPAX@Z) already defined in LIBCMTD.lib(dbgdel.obj)
nafxcwd.lib(afxmem.obj) : error LNK2005: "void * __cdecl operator new(unsigned int,int,char const *,int)" (??2@YAPAXIHPBDH@Z) already defined in LIBCMTD.lib(dbgnew.obj)
Debug/TestStaticPos.exe : fatal error LNK1169: one or more multiply defined symbols found

The non-MFC code is not using a precompiled header.I know its caused by something in the project settings but I haven't been able to track it down.

If you've seen this before and have found a way around it, Please respond.
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Question by:gmacgougan
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wyy_cq earned 600 total points
ID: 1324858
only rebuild your library.
when you do that you need to select "use mfc in static link"

or you can rebuild your library as DLL.
if you only export C function from the DLL, it is easy and simple.
but if you want to export C++ class from the DLL you must select "use mfc in static link" or "use mfc in shared link" ,what choice is made occording to your application project setting.
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by:gmacgougan
ID: 1324859
It worked
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