cannot link [against] shared libraries

cannot link [against] shared libraries

[Michalski, Rafał]

After upgrading my compiler to 3.0,
I am no longer able to link against 
the Xerces XML parser shared library.
The same C++ program that linked well under 2.95.3
now produces unresolved symbols messages
about library symbols.

The reason for upgrade was 
to get rid of the compiler bug
when gdb cannot see variables declared
in nested scopes.

Building the library itself
is lo longer possible due to ld errors.

Are some extra options necessary in 3.0 to build/link against .so ?

My platforms are Slackware Linux 8.0
and Sparc Solaris 8.

Rafal Michalski

Re: cannot link [against] shared libraries

[Alexandre Oliva]

On Jul 27, 2001, "Michalski, Rafa&lstrok;" <RMichalski@era.pl> wrote:

> After upgrading my compiler to 3.0,
> I am no longer able to link against 
> the Xerces XML parser shared library.

You'll have to rebuild that library.  GCC 3.0 has adopted the new
multi-vendor C++ ABI, which required changes in the representation of
types and modifications in name mangling.

-- 
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

RE: cannot link [against] shared libraries

[Rob Newberry]

> > You'll have to rebuild that library.  GCC 3.0 has adopted the new
> > multi-vendor C++ ABI, which required changes in the representation of
> > types and modifications in name mangling.
> 
> Does this mean i cannot use any libraries compiled with gcc < 3.0?
> Anything like openssl from any Linux distribution, for example?

I'm no GCC expert, but I understand this kind of problem from other
compilers and platforms.

The ABI issue should affect C++ libraries -- if the library exposes C++
objects (which XERCES does), then it will need to be rebuilt.

Libraries that expose only C routines -- such as OpenSSL -- should be OK.

Rob

---------------------------------------------------------------------
Rob Newberry
Director of Fajita Technology
Group Logic, Inc.

RE: cannot link [against] shared libraries

[Michalski, Rafał]

> > After upgrading my compiler to 3.0,
> > I am no longer able to link against 
> > the Xerces XML parser shared library.
> 
> You'll have to rebuild that library.  GCC 3.0 has adopted the new
> multi-vendor C++ ABI, which required changes in the representation of
> types and modifications in name mangling.

Good!

It works now, thanks lot!
And debugger sees in nested scopes.
I only had to remove -instances=static from Makefile.tmpl
- interesting for Xerces users, however.

Still wondering what with old compiled stuff.
I'm getting to prick openldap libs for first.

Yours 
Rafal

RE: cannot link [against] shared libraries

[Michalski, Rafał]

> > After upgrading my compiler to 3.0,
> > I am no longer able to link against 
> > the Xerces XML parser shared library.
> 
> You'll have to rebuild that library.  GCC 3.0 has adopted the new
> multi-vendor C++ ABI, which required changes in the representation of
> types and modifications in name mangling.

Does this mean i cannot use any libraries 
compiled with gcc < 3.0?
Anything like openssl from any Linux distribution,
for example?


/R