RE: LD_PRELOAD and dlopen

["Stephen Done" <stephen dot done at cw dot com>]

Hi Andreas,

I'm very grateful for your advice.

Cheers

Steve

> -----Original Message-----
> From: aj@suse.de [mailto:aj@suse.de]
> Sent: 30 May 2001 06:00
> To: stephen.done@cw.com
> Cc: libc-alpha@sources.redhat.com
> Subject: Re: LD_PRELOAD and dlopen
>
>
> "Stephen Done at home" <stephen.done@cw.com> writes:
>
> n> Hi Andreas,
> >
> > That did indeed fix the problem. If you have time, could you give a very
> > quick explanation of why, and also perhaps why gcc acted
> differently under
> > Solaris with the 'undefined versioned symbol name
> dlopen@@GLIBC_2.1' error.
>
> ld searches definitions in the order given on the command line.
>
> So when you did:
> gcc -Wall -ldl -fPIC -shared -o preload.so preload.c
> /usr/bin/ld: preload.so: undefined versioned symbol name dlopen@@GLIBC_2.1
> /usr/bin/ld: failed to set dynamic section sizes: Bad value
>
> ld did not search in -ldl for missing function from preload.
>
> Just run gcc -Wl,-verbose to see the difference and how ld works.
>
> Andreas
> --
>  Andreas Jaeger
>   SuSE Labs aj@suse.de
>    private aj@arthur.inka.de
>     http://www.suse.de/~aj
>