Re: [Discuss-gnuradio] FFTW3 error in GNURADIO

[Marcus Müller]

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Your main CMakeLists.txt is still looking for the double FFTW3.
replace
find_package(FFTW3)
by
find_package(FFTW3f)
and use the FindFFTW3f.cmake from the gnuradio source tree.

You'll have to replace all occurences of FFTW3_ by FFTW3F_ in your
CMake files.


On 21.03.2014 11:42, Nasi wrote:
> Thanks for quick reply!
> 
> It does not work even if I use float precision as fftwf_complex 
> *in2, *out2; out2 = (fftwf_complex*) 
> fftwf_malloc(NFFT*2*sizeof(fftwf_complex)); in2 = (fftwf_complex*) 
> fftwf_malloc(NFFT*2*sizeof(fftwf_complex));
> 
> I attach cmake files. It would be nice of you if you take a look.
> 
> - NE
> 
> 
> Fri, 21 Mar 2014 11:18:45 +0100 от Marcus Müller 
> <address@hidden>: The (F) was meant to say: Use
> FFTW3_LIBRARIES if you want to use the double precision version,
> use FFTW3F_LIBRARIES if you want the single (float, 'F') precision 
> version of the library.
> 
> Since you're using fftw_malloc (without f suffix), you're trying
> to use the double prec. version of the library, but you link
> against the single prec. version.
> 
> Greetings, Marcus
> 
> PS: The GNU Radio complex data type is identical to the float 
> complex datatype used by FFTW3F. If you want to use that, use the 
> float version of the library and replace fftw_malloc by 
> fftwf_malloc and so on.
> 
> 
> 
> On 21.03.2014 10:35, Nasi wrote:
>>>> Hi all,
>>>> 
>>>> I am using ubuntu 13.04 and GNURADIO 3.7.
>>>> 
>>>> In project  https://github.com/BogdanDIA/gr-dvbt , in 
>>>> reference_signals_impl.cc in /lib, I add inside one of the 
>>>> functions:
>>>> 
>>>> fftw_complex *in2, *out2; out2 = (fftw_complex*) 
>>>> fftw_malloc(NFFT*2*sizeof(fftw_complex)); in2 = 
>>>> (fftw_complex*) fftw_malloc(NFFT*2*sizeof(fftw_complex)); I 
>>>> get this error: ~/gr-dvbt/apps$ sudo ./top_block_rx.py 
>>>> Traceback (most recent call last): File "./top_block_rx.py", 
>>>> line 23, in <module> import dvbt File 
>>>> "/usr/local/lib/python2.7/dist-packages/dvbt/__init__.py", 
>>>> line 45, in <module> from dvbt_swig import * File 
>>>> "/usr/local/lib/python2.7/dist-packages/dvbt/dvbt_swig.py", 
>>>> line 26, in <module> _dvbt_swig = swig_import_helper() File 
>>>> "/usr/local/lib/python2.7/dist-packages/dvbt/dvbt_swig.py", 
>>>> line 22, in swig_import_helper _mod = 
>>>> imp.load_module('_dvbt_swig', fp, pathname, description) 
>>>> ImportError: /usr/local/lib/libgnuradio-dvbt.so: undefined 
>>>> symbol: fftw_malloc
>>>> 
>>>> I read and did the articles: 
>>>> http://lists.gnu.org/archive/html/discuss-gnuradio/2014-02/msg00479.html
>>>>
>>>>
and
>>>>
>>>> 
http://gnuradio.4.n7.nabble.com/FFTW3-runtime-error-td46690.html
>>>> . However, in lib I cannot add  ${FFTW3(F)_LIBRARIES} to your
>>>> lib/CMakeLists.txt. It gives me an error. Therefore I 
>>>> replaced that with  ${FFTW3F_LIBRARIES}.
>>>> 
>>>> Where am I making mistake?
>>>> 
>>>> - NE
>>>> 
>>>> 
> 
> 
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