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Re: [Discuss-gnuradio] Link FFTW3 in OOT module

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] Link FFTW3 in OOT module
Date: Wed, 26 Feb 2014 14:44:18 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0

Hi Mischa,

we need to make an FAQ of this :)
actually, to use the fftw, you need to directly link to the fftw. Depending on whether you need the single precision floating point version ("fftwf_*" which GNU Radio uses) or the double precision one ("fftw_*"), you can use the FindFFTW3(f).cmake script from the GNU Radio source tree,
or use my modified version.
Put the .cmake modules under cmake/Modules, and add the find_package(FFTW3(f)) directive to your master CMakeLists.txt; also, add the link and include directories (look at the occurences of "FFT" in my CMakeLists.txt):


On 02/26/2014 02:32 PM, Sabathy Mischa wrote:
Dear all

I try to link the FFTW3 lib to my OOT module but always get the error:

Linking CXX executable test-mymodule
libgnuradio-mymodule.so: undefined reference to `fftw_plan_dft_1d'
libgnuradio-mymodule.so: undefined reference to `fftw_destroy_plan'
libgnuradio-mymodule.so: undefined reference to `fftw_malloc'

How can I add FFTW3 to cmake? I found a solution of older days where ./configure was used, but with the cmake version I can't find a solution. Is it possible to use gr_modtool do link a library?

Thanks for the help.
Best Regards

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