[ovs-discuss] Problem with VLOG module init

Ahmed Talha Khan auny87 at gmail.com
Wed Dec 5 20:24:43 UTC 2012


What exactly do you mean by that? Do you want me to past config.log?


On Thu, Dec 6, 2012 at 12:50 AM, Ben Pfaff <blp at nicira.com> wrote:

> What's in config.status?
>
> On Wed, Dec 05, 2012 at 11:46:17PM +0500, Ahmed Talha Khan wrote:
> > Its Linux with kernel 2.6.35 on Fedora 14 x86_64 machine. And yes thats
> > what I though too that only VLOG_DEFINE_THIS_MODULE should do the job as
> it
> > creates and the actual module as well as the reference.
> >
> > I see that it is defined like this
> >
> > #define VLOG_DEFINE_THIS_MODULE(MODULE)                                 \
> >         VLOG_DEFINE_MODULE(MODULE);                                     \
> >         static struct vlog_module *const THIS_MODULE = &VLM_##MODULE
> >
> >
> > The 2nd line to create a reference works as its not a compile issue. The
> > linker cries which means that VLOG_DEFINE_MODULE(MODULE) failed to create
> > the module in the linker section as given by
> >
> > #define VLOG_DEFINE_MODULE(MODULE)                                      \
> >         VLOG_DEFINE_MODULE__(MODULE)                                    \
> >         extern struct vlog_module *vlog_module_ptr_##MODULE;            \
> >         struct vlog_module *vlog_module_ptr_##MODULE                    \
> >             __attribute__((section("vlog_modules"))) = &VLM_##MODULE
> >
> >
> > Any ideas now what might have happened? Could be it some sort of a
> version
> > mis-match for the GNU linker "ld"?
> >
> >
> >
> > On Wed, Dec 5, 2012 at 8:35 PM, Ben Pfaff <blp at nicira.com> wrote:
> >
> > > On Wed, Dec 05, 2012 at 12:29:51PM +0500, Ahmed Talha Khan wrote:
> > > > I am trying to register one of my own modules for logging purpose
> but it
> > > > does not seem to work.
> > > >
> > > > In my source file xyz.c included
> > > >
> > > > VLOG_DEFINE_THIS_MODULE(xyz);
> > > >
> > > > and then later in the file i use
> > > >
> > > > VLOG_INFO("some msg printed here")
> > > >
> > > > But when I run make, the linker cries:
> > > >
> > > > undefined reference to `VLM_xyz'.
> > > >
> > > > What am I missing here. Isnt this suppose to be a simple operation?
> > >
> > > Yes, all you should need is the VLOG_DEFINE_THIS_MODULE line.
> > >
> > > What kind of system are you using?
> > >
> >
> >
> >
> > --
> > Regards,
> > -Ahmed Talha Khan
>



-- 
Regards,
-Ahmed Talha Khan
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