Re: [Mingw-users] Using gcc dll in MSVC

[Brian D. <br...@de...>]

Yasir Niaz Khan wrote:

> I want to make a dll using gcc on cygwin and use it in an MFC program
> that i make in MSVC 2005. I have tried a dozen solutions from Internet
> but none worked. I am able to use this dll in gcc applications and in C
> programs that i compiled using MSVC compiler (cl), but i am unable to
> even load the dll in an MFC application. Can anybody provide steps for
> doing so, as i am not a big expert in dll's.

It sounds like you're trying to mix C++ objects from different compilers
(or even different branches of g++.)  That won't work, because there are
a great number of behind the scenes details in C++ that are
compiler-implementation-specific.  This is why each compiler has its own
unique name mangling scheme, to prevent people from succeeding in
linking foreign C++ objects.

You can get a great deal of interoperability by restricting all
interfaces to plain C or C++ with 'extern "C"' semantics but you can't
directly mix C++.  That's just how it goes.  There's a page on this in
the wiki.

Also, Cygwin is a separate project with its own mailing list; it's not
supported here.  However, the Cygwin gcc and MinGW gcc are quite similar
(and Cygwin's "gcc -mno-cygwin" is a shortcut for running the MinGW gcc
binary in the Cygwin build environment.)

Brian