Hi Martin,
Thanks for the pointer. For some reason I did not see your response in my in
box, but only now that I checked the online list. Saying that because on my own
I finally tracked the problem down, which made me curious about any responses...
For the sake of anyone who cares, the main clue was, of course, linking. Once I
had read enough about cmake and then looked in my <module>/lib/CMakeLists.txt
at the “target_link_libraries”, it became clear enough.
I added to the OOT root level <module>/CMakeLists.txt a find_package(PugiXML)
and supporting check (I’m using libpugixml-dev on my system). I made sure the
PugiXML_LIBRARY and PugiXML_INCLUDE_DIR were added in the right places in the
CMakeLists.txt.
Of course, I had to add to cmake/Modules the appropriate FindPugiXML.cmake
module for all that to work.
Then, in <module>/lib/CMakeLists.txt, I added in the target_link_libraries the
reference to the libpugixml, specifically “${PugiXML_LIBRARY}. I placed it
right after “gnuradio-<module>”, but I suppose it could have been placed at the
end as well.
Anyway, as per usual I can hope that figuring this out the hard way (aka, right
way by RTFM) I may have learned something that will stick in my head.
Time to go write this up in my HOWTO wiki…
Thanks again!
steven
> Hi Steven,
>
> if you go to cgran.org, you'll find a bunch of OOTs that have external
> dependencies. gr-nacl depends on libsodium, for example. I recommend
> checking those CMake files for examples.
>
> M
>
> On 05/16/2016 08:37 AM, Steven Knudsen wrote:
> > Hi,
> >
> > I would like to do something I think is not uncommon and that’s to add
> > XML support to a block (e.g., to read a config file).
> >
> > Everything compiles, but on link all the libxml2 functions generate
> > “undefined references”. I believe there is a missing -lxml2, but how and
> > where to add?
> >
> > Online search does not turn up much, and what there is seems to be from
> > around 2008 when the build system was different.
> >
> > I did try modifying the CMakeLists.txt for my module, but it appears
> > that I don’t know how to augment or override the GR support for libxml2.
> > That is, I can add find_package(LibXml2) and that works as expected, but
> > modifying any of the env vars doesn’t seem to help.
> >
> > Any advice would be much appreciated. I suspect there may be an example
> > out there that I’ve just not found and I will be chagrined, but grateful
> > to the person that kicks me that direction…
> >
> > Thanks very much,
> >
> > steven
> >
> >
> > Steven Knudsen, Ph.D., P.Eng.
> > www. techconficio.ca <http://techconficio.ca <http://techconficio.ca/>>
> > www.linkedin.com/in/knudstevenknudsen
> > <http://www.linkedin.com/in/knudstevenknudsen
> > <http://www.linkedin.com/in/knudstevenknudsen>>
> >
> > /Der entscheidende Augenblick der menschlichen Entwicklung
> > ist immerwährend. Darum sind die revolutionären geistigen Bewegungen,
> > welche alles Frühere für nichtig erklären, im Recht, denn es ist
> > noch nichts geschehen. - Franz Kafka/
> >
> >
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > address@hidden
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> > <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>
> >
_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
