[Mingw-users] vtables incompatible with visual studio compiler

[Roman W. <rom...@gm...>]

Dear mingw team.

I have noticed that vtables generated by mingw are different than
those from visualstudio.
The incompatible code is generated by such class.

class Vtable {
 virtual void Overloaded(int) = 0;
 virtual void Overloaded(Vtable&) = 0;
 virtual void Other() = 0;
};

According to what i found here:
http://old.nabble.com/Incorrect-vtable-generation-in-MinGW--td15781052.html
I have made my code compatible using such prepossessing.

class Vtable {
#ifdef __GNU__
 virtual void Overloaded(Vtable&) = 0;
 virtual void Overloaded(int) = 0;
#else
 virtual void Overloaded(int) = 0;
 virtual void Overloaded(Vtable&) = 0;
#endif
 virtual void Other() = 0;
};

It is not an example of code I use, but same trick has helped in my problem.
I use miingw 4.4, and the becomes compatible with what visual studio
6.0 generates, and as i believe  with the newer versions of vs.

Is there some compiler option so ming would generate vs compatible vtables?
Maybe there is some other way to make a code compatible, some
preprocessor macro probably like:

class Vtable __gcc_make_MSC_vtables_
{
 virtual void Overloaded(int) = 0;
 virtual void Overloaded(Vtable&) = 0;
 virtual void Other() = 0;
};

Any way I think the problem should be described some where on
http://www.mingw.org/wiki.