How can I make ELF library in C++ ?

[Ghost in the shell]

I've seen that there were some troubles when I try to use dlsym in a C++
program because the ELF format library compiled by g++ doesn't look like
the ELF's one compiled by a c compiler.

I'm asking How to make and use ELF library in c++ ?
Thank if you've heard my call.

PS: I'm actually using a debian with everything recent.(gcc 2.95.2 etc...)
And I've also already read the gcc litterature without success.(I may
forget some docs)