In the Borland C++ (bcc64 non-modern) codebase I’m working on, a number of class definitions emit the following warning:

warning W7041: Interface 'XXX' does not derive from IUnknown. (Interfaces should derive from IUnknown)

I can confirm that this warning does not cause trouble in my context. Rather than interfere with the class hierarchy, I would like to suppress the warning. I have tried:

• Compiler options UI – warning is not featured there
• #pragma diagnostic ignored "-Wall" (Clang)
• #pragma warn disable (bcc32 only)

But the warning still appears. I suspect that this warning is probably a language extension specific to the Borland frameworks. Therefore, the standard compiler mechanisms might not work.

Any ideas how to specifically suppress this warning, either from source code or compiler options?