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

[jeroen]

Marcus Müller schreef op 2013-12-06 13:38:
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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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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