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 <b...@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
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