Re: [Discuss-gnuradio] Problem using FFT-class in my own written block (part II)

[Tom Rondeau]

On Fri, Dec 6, 2013 at 8:43 AM,  <address@hidden> wrote:
> Marcus Müller schreef op 2013-12-06 13:38:
>
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> Hej Jeroen,
>>
>>> 2) In the top-level CMakeLists.txt I modified/added (just guessing
>>> what to do...):
>>
>>
>> I wouldn't call your method "guessing"; you used strong indications! :D
>> Ok, now I see what your problem is: It's not that you don't link
>> against FFTW (the library that does the actual FFT calculations), but
>> that you don't link against gr-fft, the GNU Radio fft helpers and
>> wrappers and widgets!
>>
>> Now everything makes sense. The point is: with 3.7 it's easy to use
>> certain GNU Radio components, just by adding[1]:
>> set(GR_REQUIRED_COMPONENTS RUNTIME FILTER)
>> to the master CMakeLists.txt.
>>
>> For 3.6, I can't verify that right now, but doing
>> find_package(gnuradio-fft)
>> instead should do the trick (I hope the spelling is right, though.
>> Look into /usr/local/lib/pkgconfig/gnuradio* ). The resulting
>> variables should then be something like[2]:
>> GNURADIO_FFT_INCLUDE_DIRS (or LIBRARY_DIRS, respectively).
>> You might need to google the correct naming, though.
>>
>> Jay!
>> Happy hacking
>>
>>
>> 1:
>>
>> http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModulesConfig#Configuring-Our-Project-to-Use-GNU-Radio-Libraries
>> 2: http://www.cmake.org/Wiki/CMake:How_To_Find_Libraries
>> -----BEGIN PGP SIGNATURE-----
>> Version: GnuPG v1.4.15 (GNU/Linux)
>> Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
>>
>> iQEcBAEBAgAGBQJSocVCAAoJEAFxB7BbsDrLYeMH/iyINXohTKFSxNaZL5df6qdE
>> tpUni2POUwzfM32vcmdVovj6IQcKppEWz3Xugd8KAxtkSQYJd9+f7EZydIvnsG+R
>> /ToQ8ARBTDUsFZpe0HaKUGKTiY6Q8pI3SneOAug7/RMZffK8UcV/ObFyCn0ZEI7+
>> 2phikCxt4XaQr+KqvA/242BPR3jPPiDil3Ok1ocsQpn/CuLf+NHTnSFQaSFGTPPQ
>> I/rw9c5GIy7Hn4s7I+KCjxdkJcZ/PXVJcfOveec3BzV03NTXjpV8tgr4cTj5aars
>> 9o48MrnbGjdZO5irRmaUi7mDj7sAKGC3wWPmgCk9Iapo2lI+BIBZ16d7hCkVexs=
>> =bQt9
>> -----END PGP SIGNATURE-----
>>
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> address@hidden
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>
>
> Sorry, does not work. There is a gnuradio-fft.pc so I tried:
>
>     find_package(gnuradio-fft)
>
> But it immediatly starts whining about not finding
> "gnuradio-fftConfig.cmake" or "gnuradio-fft-config.cmake". Well, neither of
> those two files exists in the GNU installation...
>
> This is kind of frustrating, already spending like three full days on just
> trying to link an FFT library and searching the internet for doing that.
> It's absurd...
>
>    Jeroen


You don't want to use find_package for something if you're just trying
to get information out of the .pc file. Use PKG_CHECK_MODULES:

http://www.cmake.org/Wiki/CMake:How_To_Find_Libraries
http://www.cmake.org/cmake/help/cmake2.6docs.html#module:FindPkgConfig

Tom