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Re: [Discuss-gnuradio] FFTW usage in a new signal processing block

From: Martin Braun
Subject: Re: [Discuss-gnuradio] FFTW usage in a new signal processing block
Date: Thu, 25 Aug 2011 15:04:18 +0200
User-agent: Mutt/1.5.20 (2009-06-14)

On Thu, Aug 25, 2011 at 09:57:30AM -0300, Felipe Fideles wrote:
> 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 to `fftw_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.

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


Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

Dipl.-Ing. Martin Braun
Research Associate

Kaiserstra├če 12
Building 05.01
76131 Karlsruhe

Phone: +49 721 608-43790
Fax: +49 721 608-46071

KIT -- University of the State of Baden-W├╝rttemberg and
National Laboratory of the Helmholtz Association

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