FFTW usage in a new signal processing block

GNU Radio
1

Hello All,

I’m trying to use FFTW in the development of a new signal processing
block.
The ./boostrap and ./configure commands work fine, but when I type the
make
command, I get the following error:

/usr/src/gnuradio/gr-deteccao/lib/.libs/libgnuradio-deteccao.so:
undefined
reference to fftw_execute' /usr/src/gnuradio/gr-deteccao/lib/.libs/libgnuradio-deteccao.so: undefined reference tofftw_plan_dft_1d’
/usr/src/gnuradio/gr-deteccao/lib/.libs/libgnuradio-deteccao.so:
undefined
reference to `fftw_destroy_plan’
collect2: ld returned 1 exit status

It sounds weird because the fftw in already at the gnuradio files.

2

On Thu, Aug 25, 2011 at 09:57:30AM -0300, Felipe F. wrote:

/usr/src/gnuradio/gr-deteccao/lib/.libs/libgnuradio-deteccao.so: undefined
reference to `fftw_destroy_plan’
collect2: ld returned 1 exit status

It sounds weird because the fftw in already at the gnuradio files.

That doesn’t mean FFTW gets linked to your new blocks. Like any other
library, you still have to set the linker settings.

MB

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