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

There is a common theme running through some of the answers here.

Avishek Bose:-

Declare the mfc80ud.lib and mfcs80ud.lib in the Additional Dependancies field in the Project Properties -> Linker Tab -> Input of Visual Studio to fix the issue.

vmb100:-

I am working with Visual Studio 2010, so in my case the MFC lib is called mfc100.lib.

joseAndresGomezTovar:-

I have a very similar problem. [mfcs110d.lib(dllmodul.obj) : error LNK2005: _DllMain@12 already defined in MSVCRTD.lib(dllmain.obj)] and the solution was add mfcs110d.lib to Additional Dependencies

So the general case seems to be to first find the name of the library to add ...

and then to add it ....

Note that there seem to be some prerequisites and/or alternative solutions.