[Issue 22287] New: ambiguous virtual function for extern(C++) under Windows

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22287

          Issue ID: 22287
           Summary: ambiguous virtual function for extern(C++) under
                    Windows
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: tim.dlang at t-online.de

The following does not compile under Windows with some compiler flags:

extern(C++):

class A
{
    ~this();
}

interface I
{
    int f() const;
}

class B : A, I
{
    override int f() const;
}

class C : B
{
    override int f() const;
}

The code compiles under Linux with dmd -c test.d.

Compiling it under Windows with dmd -m32mscoff -c test.d results in the
following error:
test.d(18): Error: class `test.C` ambiguous virtual function `f`
test.d(18): Error: class `test.C` ambiguous virtual function `f`

Using -m64 instead of -m32mscoff results in the same error.
It can be successfully compiled under Windows with just dmd -c test.d, but I
don't know if the resulting binary would work.

All tests used dmd v2.097.2.

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