Is a gnu object file like an other compiler object file

[Giulio Guarnone]

Hi to all,

I've a simple question, maybe silly but I'm not very fond with this 
topics (I generally use only a compiler).

I've a static library (not open source) implementing a protocol. I don't 
know with what compiler was compiled, I know only that is the Linux 
version, so I try to link it with my program but I always fail.
In my gcc string I use other linux opensource libraries without any problem.

What kind of problem could it be ?

Could the library be compiled with a non-gnu compiler ?

I've used the "ar xv <library>.a" to obtain *.o files and then I've 
create both a static and a dynamic library but the result library didn't 
work.

Any idea ?

Thanx,
Giulio