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

[Marcus Müller]

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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
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