How to refer to DLL without head file using mingw on windows?

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DLL

Hello,First of all sorry for my English.
I have e method (SomeMethod() ) in dll which is called ILogger.dll. I need to invoke this method from another dll which is called IModel.dll.
I'm using MinGW and I can create an ILogger.dll (which consist ILogger.h and ILogger.cpp). I need to build a IModel.dll (which consist IModel.h and IModel.cpp) and IModel.cpp need to use method which describe in ILogger.cpp. How can I compile and build IModel.dll if I only have IModel.h, IModel.cpp and ILogger.dll (no have file ILogger.cpp and ILogget.h after the compiled)

What I have tried:

I have tried this action:
use the command g++ -c -DEXPORTS IModel.cpp -L. -lLogger.dll
it doesn't work (can't understand what is ILogger in the code).
Note - EXPORTS is a tag from this code in IModel.h

#ifdef EXPORTS
    #define SMPInfrastructure_API __declspec(dllexport)
#else
    #define SMPInfrastructure_API __declspec(dllimport)
#endif