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

For me the direct cause was indeed a missing _afxForceUSRDLL symbol reference, but the indirect cause was a missing _USRDLL macro definition. It is defined by default by the VC wizard, but occasionally devs erase it erroneously. Here it is in more words.