C++ Interop (/CLR) - Error LNK2028 ???

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I want to integrate C# user control in an “classical” MFC application. The whole project contains one .EXE and many .DLLs with objects used by the .EXE.

When DLLs are compiled, object are declared with “_declspec(dllexport)”.
When objects are used in .EXE, the are declared with “_declspec(dllimport)”.

I have added the /CLR option only in the .EXE (DLLs have only “business objects”). And when I compile the solution, I have the following error:

Error LNK2028: unresolved token (0A0001A5) “public int __thiscall CXXX:Xxxx() …..”
When I compiled the solution without the /CLR option, all is good.

The help on this error explains that in native, the calling convention is “__cdecl” and in /clr:pure it is “__clrcall”. But I’m not in /clr!pure, I use only the /CLR option.

Any idea on how to solve this problem ? Unfortunately, I cannot add the /CLR option in all DLLs because I have a lot of errors (it will be a hard work).

Thanks for your help!