Re: Problem migrating an OOT module that uses FFT from 3.8 to 3.9

[Ron Economos]

Ralf,

I'm not sure if you've done this already, but when you use 
d_fft_calculator, you need to change from -> to . to access it.

Ron

On 1/29/22 12:24, Ralf Gorholt wrote:
> Hello all,
>
> I am currently trying to migrate an OOT module that uses an FFT object
> internally from  GNU Radio version 3.8 to 3.9.
>
> In my .h file I have got this:
>
>     //old: gr::fft::fft_complex d_fft_calculator;
>     gr::fft::fft_complex_fwd d_fft_calculator;
>
> and in the constructor member initializer list this:
>
>       //old: d_fft_calculator(gr::fft::fft_complex(pow(2.0, 10 + mode),
> true, 1)),
>       d_fft_calculator(pow(2.0, 10 + mode), 1),
>
> The module compiles without a problem but when I start the flowgraph I
> get the message "ImportError: /usr/local/lib/libgnuradio-dl5eu.so.1.0.0:
> undefined symbol: _ZN2gr3fft3fftISt7complexIfELb1EED1Ev". It looks to me
> that somewhere "fft_complex" is still called behind the scenes but I
> can't see where.
>
> Can anyone tell me how I need to correct this?
>
> FYI, I have recreated the module and the blocks with gr_modtool and then
> copied the relevant code from the old to the new version.
>
> Thank you very much and kind regards,
>
> Ralf