Mailinglist Archive: opensuse (1483 mails)

[Andreas Jaeger <aj@xxxxxxxx>]

On 02/27/2012 05:50 PM, Cristian Rodríguez wrote:
> El 27/02/12 13:24, Cristian Rodríguez escribió:
> > El 27/02/12 09:53, Bernhard Voelker escribió:
> > > In the GNU coreutils project, there was a discussion about a new
> > > test which uses a destructor in an *.so file loaded into program
> > > space via LD_PRELOAD:
> > >
> > > http://lists.gnu.org/archive/html/coreutils/2012-02/msg00173.html
> > >
> > > However, the destructor is not run on OpenSuSE (nor on SLES10.x btw.),
> > > but works fine on other systems (e.g. Redhat).
> > >
> > > This is Jim's commit:
> > > http://git.savannah.gnu.org/cgit/coreutils.git/commit/?id=b29db6767612cf70e9d4c7eb6ede9822f6173fca
> > >
> > >
> > >
> > > Attached is the relevant C code which intercepts the system calls
> > > getxattr() and lgetxattr(). The number of calls is counted and
> > > should be stored in a file "x" by the destructor print_call_count():
> > >
> > > void __attribute__ ((destructor))
> > > print_call_count (void);
> > >
> > >
> > > Compile / link it:
> > >
> > > $ gcc -fPIC -O2 -c k.c
> > > $ ld -G k.o -o k.so
> >
> >
> > Works for me , I am in factory though.
>
>
> # gcc -shared -rdynamic -march=native -Wall -fPIC $(rpm --eval
> %optflags) k.c -o k.so
>
> LD_PRELOAD="./k.so" ls --color=always -l .
>
> cat x --> 74

That works fine on 12.1 for me as well.

ld -G is just not the right way to build a shared library, you should 
really use gcc -shared,

Andreas
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