Re: [Mingw-users] Exporting classes to MS Visual C++

[Marcello P. <te...@at...>]

Hi Danny,
thank you very much
Now it is totally clear.
I think that the idea of 'standardize some of the C++ ABI issues and that G++
developers' it is a very good one, and worthy of the effort.

Marcello

Danny Smith wrote:

> > Everything is working perfectly with C functions, but not with C++
> > classes.
> > There are two problems:
> > 1) it is hard to decipher the name mangling of Microsoft's compiler
> > (especially for overloaded functions)
> > 2) I need to export the virtual table
> > It seems possible to export/import the virtual table but  I'm
> > wondering
> > if the virtual table would be managed by the gnu compiler in way
> > compatible with the MS Visual C++ compiler.
> >
> > What do you think ?
> > Do I have to give up ?
> >
> > Marcello
> >
>
> Hello Marcello
>
> This is from the g++ FAQs
>
> "Why can't I link g++-compiled programs against libraries compiled by
> some other C++ compiler?"
>
> "Some people think that, if only the FSF and Cygnus Support folks would
> stop being stubborn and mangle names the same way that, say, cfront
> does, then any g++-compiled program would link successfully against any
> cfront-compiled library and vice versa. Name mangling is the least of
> the problems. Compilers differ as to how objects are laid out, how
> multiple inheritance is implemented, how virtual function calls are
> handled, and so on, so if the name mangling were made the same, your
> programs would link against libraries provided from other compilers but
> then crash when run. For this reason, the ARM encourages compiler
> writers to make their name mangling different from that of other
> compilers for the same platform. Incompatible libraries are then
> detected at link time, rather than at run time. "
>
> I believe there is a movement to standardise some of the C++ ABI issues
>  and that G++ developers, particularly Jason Merrill, are involved in
> this movement.  See here:
>
> http://reality.sgi.com/dehnert_engr/cxx/cxx-summary.html
>
> In the future, you may be able to do what you have suggested with the
> Bltz++ lib.  But not yet.
>
> Cheers
>
> danny
>
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