creating shared object

creating shared object

[Eerden, Jense van der]

L.S.

I'm having a small problem and I wonder if this address is the correct entry
point for questions. If not: please let me know.

My problem is to create a shared object on a UNIX system. When I use your
compiler/linker to create a shared object and I want to link some additional
libraries with it using the -L and -l options, I still get error messages
for unresolved symbols, althoug I'm sure all necessary libraries are
included.

Can you please give us some examples for creation of shared objects, that
have to include several  libraries (.a) ?

Please respond..., thanks in advance

Re: creating shared object

[Alexandre Oliva]

On Nov 10, 2000, "Eerden, Jense van der" <Eerden@hitt.nl> wrote:

> My problem is to create a shared object on a UNIX system. When I use your
> compiler/linker to create a shared object and I want to link some additional
> libraries with it using the -L and -l options, I still get error messages
> for unresolved symbols, althoug I'm sure all necessary libraries are
> included.

This is a linker issue, not a compiler issue, so a question to the
binutils mailing list would probably have been more appropriate.

Anyway, this is kind of a linker FAQ.  The order of object files and
libraries *is* relevant, and the linker does a single pass looking for
undefined symbols.  So, if a static library is listed *before* object
files or other libraries that use symbols from it, they won't be
pulled into the executable or shared library that you're creating.  If
static libraries have cross-dependencies, you may have to list them
more than once.

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist    *Please* write to mailing lists, not to me