From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joerg Faschingbauer <jfasch@hyperwave.com>
To: help-gcc@gnu.org
Subject: Re: Linking shared libraries on hpux 10.20 with gcc 2.92.1 fails !!
Date: Tue, 30 Nov 1999 23:28:00 -0000
Message-ID: <86vh791ium.fsf@hwiw01.hyperwave.com>
References: <38183EF6.39D5007F@oi42.kwu.siemens.de> <80cg0h$a0l$1@nnrp1.deja.com>
X-SW-Source: 1999-11n/msg00173.html
Message-ID: <19991130232800.GTmW_qAVTtXfx-33EhRNJ5WVu4iu_kf-k4y_3EoifMk@z>

jd_wells@my-deja.com writes:

> I am currently experiencing the exact same
> problem.  Did you ever find out what the problem
> is?
> 
> Any help would be appreciated...
> JD Wells
> 
> 
> In article
> <38183EF6.39D5007F@oi42.kwu.siemens.de>,
>   "Dr. Armin Tschammer"
> <tscha00a@oi42.kwu.siemens.de> wrote:
> > Hi,
> > Now I succeded in compiling and installing the
> gcc 2.95.1 on a hpux
> > 10.20 box.
> > I would like to create shared libraries and I
> did the following:
> >
> >                   g++ -fpic  -c a.C
> >                   g++ -fpic  -c  b.C
> >                   g++ -shared  a.o b.o -o x.sl
> >
> >   I got the following message:
> >
> > /usr/ccs/bin/ld: DP relative code in
> file /var/tmp/cc2TTYoc.o - shared
> > library must be position
> >     independent.  Use +z or +Z to recompile.
> > collect2: ld returned 1 exit status
> >
> > Any hints ??

A common trap in building shared C++ libs is that gcc itself (and
libstdc++.a) does not bootstrap PICly by default. You have to tell it
to. Configure as usual, and

make bootstrap CFLAGS=-fPIC CXXFLAGS=-fPIC

Also, pass -fPIC (-fpic?) on the link line as well because, when
linking, g++ (collect2) generates code for the ctors of global objects
to be called properly. This code has to be compiled PICly.

I don't know if this cures all of your problems for the HP, but it
sure helps along the way. I once managed to make a HP shared lib with
gcc 2.7.2.3, and ended up with a weird link line that read as follows,
for whatever reason.

g++ -fPIC -shared <the files> -l<library1> ... \
        -Xlinker +I -Xlinker _GLOBAL__DI \
        -u __eprintf -u __pure_virtual -u __builtin_delete \
        -u __builtin_new -u __builtin_vec_delete -u __builtin_vec_new  \
        -u __muldi3 -u __udivdi3 -u __umoddi3 -lgcc \
        the_shared_lib.sl

Joerg