[fpc-devel] VMT compatibility

[Alexey Barkovoy]

>> I where any chance to see FreePascal generating VMT's for classes that is 
>> more compatible with C++ / TurboPascal / Delphi one?
>> To explain mine question: recently I've been porting Delphi framework 
>> interfacing to C++ code to FPC and finded out that althrow Delphi VMT layout 
>> is compatible to C++ one, FPC is not.
>
> Are you sure Delphi is compatible to "C++" or just to Borland C++? The latter 
> would be logical, since both Delphi and C++ Builder use the same backend. Or 
> are Delphi classes also binary compatible with Visual C++ and g++ classes?

Delphi is compatible at least with Borland C++ and MS VC++. And taking in accout 
how COM intefaces are implemented in C++ (I'm supposing here all C++ compilers 
support the same syntax) - each C++ compiler supporting MS way to declare COM 
interfaces has compatible VMT layout.

Alexey