error LNK2005: _DllMain@12 already defined in MSVCRT.lib

Question

I am getting this linker error.

mfcs80.lib(dllmodul.obj) : error LNK2005: _DllMain@12 already defined in MSVCRT.lib(dllmain.obj)

Answer 1

MSDN knowledge base ID Q148652.

http://support.microsoft.com/kb/148652

Cause: Visual C++ compiles the source files in alphabetical order, and passes the compiled object files to the linker in alphabetical order. If the linker processes DLLDATAX.OBJ first, the source code references DllMain, which the linker loads from MSVCRTD.LIB(dllmain.obj). The linker then processes an object file compiled from a C++ file that contains #include "stdafx.h", which references the symbol __afxForceUSRDLL, which the linker loads from MFC42D.LIB(dllmodul.obj). This object module also contains an implementation for DllMain, causing the conflict.