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I have an application exporting two functions, each returning an
interface based on IUnknown. The application is written in Borland
C++, and the functions are executed from a Delphi application. Now
there is a need to port the application to a Visual C++ MFC ActiveX
application. How to write these functions so they can still be
executed from the same Delphi application?

In the application, the definitions of the functions looks as follows
(C++ Builder)

extern "C"
{
  _di_IUnknown __stdcall __declspec(dllexport) GetOneInterface()
  {
    return (IOneInterface*) &g_InterfacesImplementer;
  }

  _di_IUnknown __stdcall __declspec(dllexport) GetAnotherInterface()
  {
    return (IAnotherInterface*) &g_InterfacesImplementer;
  }
}