Re: [Discuss-gnuradio] Signal processing block, ImportError, undefined symbol

[Nick Foster]

On Wed, 2011-05-18 at 16:16 +0200, Michael Höin wrote:
> Hi all
> 
> I created a new signal processing block. The examples "howto_square_ff",
> "howto_square2_ff" work fine. If I use "sudo make" and "sudo make
> check" (with my new block included) I get an Error: 
> "Traceback (most recent call last):
>   File "./qa_howto.py", line 24, in <module>
>     import howto
>   File "/home/hoim/gr-howto-write-a-block-3.0.2/src/lib/howto.py", line
> 24, in <module>
>     _howto = swig_import_helper()
>   File "/home/hoim/gr-howto-write-a-block-3.0.2/src/lib/howto.py", line
> 16, in swig_import_helper
>     import _howto
> ImportError: /home/hoim/gr-howto-write-a-block-3.0.2/src/lib/.libs/_howto.so: 
> undefined symbol: _Z25howto_make_detect_cut_vccjjjj" 
> 
> I saw in the Discuss-gnuradio a thread called "Help with Undefined
> Symbol error --- undefined sy" with nearly the same problem, but in my
> case I have not found a incorrectly named "make" function.

make distclean
grep "howto" * -r

that will give you a list of the things you need to change. ignore the
various Makefile.swig.gen, Makefile.in, etc.

--n

> 
> Any idea? Any help will be appreciated
> 
> Thanks
> Michael
> 
> 
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