I make an MFC ActiveX component in Visual C++ 2005 and need to link the C++ runtime and MFC as static libraries to reduce the DLL hell for end users. The problem seems to be that the static library did not implement the methods that existed in the dynamic version of MFC.

I have implemented my own DllCanUnloadNow with a use counter but I can't implement DllGetClassObject because everything in MFC is hidden with many layers of inheritance and thin documentation.

I have access to my own control class inheriting COleControl but I can't find access to the class ID (CLSID m_clsid) or the hidden factory class implementing QueryInterface.

It seems that the runtime dependency was removed when I selected to use a static MFC so that I removed it twice. Now it is working without dependencies to the MFC or C++ runtime.

Now the dynamic library is back somehow and causing link errors.

Compiling the same code again caused the error to disappear.