Signal processing block, ImportError, undefined symbol

GNU Radio
1

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
import howto
File “/home/hoim/gr-howto-write-a-block-3.0.2/src/lib/howto.py”, line
24, in
_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.

Any idea? Any help will be appreciated

Thanks
Michael

2

On Wed, 2011-05-18 at 16:16 +0200, Michael Höin wrote:

_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