Hi, thank you very much. Your hints helped me towards the right direction. I added:
"find_package(Gnuradio "3.10" REQUIRED fft blocks analog filter digital) " to the CMakeLists.txt in gr-mymodule and i added "target_link_libraries(gnuradio-mymodule gnuradio::gnuradio-runtime gnuradio::gnuradio-fft gnuradio::gnuradio-blocks gnuradio::gnuradio-analog gnuradio::gnuradio-filter gnuradio::gnuradio-digital)" If I now do "import mymodule" in a python terminal, it works now, but... I am not able to open gnuradio anymore: <<< Welcome to GNU Radio Companion 3.10.5.0 >>> Block paths: /home/niklas/.grc_gnuradio /usr/share/gnuradio/grc/blocks /usr/local/share/gnuradio/grc/blocks Loading: "/home/niklas/Workspace/Niklas_flowgraphs/Transceiver_Station_1.grc" Segmentation fault (core dumped) Would be great, if anyone has an idea Best, ________________________________ Von: Philipp Niedermayer <p.niederma...@gsi.de> Gesendet: Montag, 20. März 2023 13:26:58 An: Beckmann, Niklas Cc: discuss-gnuradio@gnu.org; Brandon Smith Betreff: Re: Import Error "undefined symbol" It might be as simple as adding "gnuradio::gnuradio-digital" to the "target_link_libraries" in your mymodule/lib/CMakeList.txt. Maybe you also have to adjust the "find_package" in your mymodule/CMakeList.txt to something like "find_package(Gnuradio "3.10" REQUIRED COMPONENTS digital)". ________________________________ From: Brandon Smith [mailto:blsmit5...@gmail.com] Sent: Monday, March 20, 2023 at 11:37 UTC+1 Subject: Import Error "undefined symbol" You may have not linked a library in your cmake. Looks like you wanted digital packet header but have not provided a library for it. Perform ldd on /usr/local/lib/x86_64-linux-gnu/libgnuradio-mymodule.so.1.0.0 and see if the missing library is shown. On Mon, Mar 20, 2023 at 4:59 AM Beckmann, Niklas <niklas.beckma...@rwth-aachen.de<mailto:niklas.beckma...@rwth-aachen.de>> wrote: Hi everybody, in a Flowchart, I am using an Import Block. Gnuradio shows me the following: Param - Import(imports): Import "import mymodule" failed. The module "mymodule" is installed properly and without any error. The blocks of this module are working (except of the one that i need the import for) and showed on the sidebar where all the blocks are found. To get more information about the error, I opened a pyhton termial with the following result: niklas@niklas:~$ python Python 3.8.10 (default, Nov 14 2022, 12:59:47) [GCC 9.4.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import mymodule Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/local/lib/python3.8/dist-packages/gnuradio/mymodule/__init__.py", line 18, in <module> from .mymodule_python import * ImportError: /usr/local/lib/x86_64-linux-gnu/libgnuradio-mymodule.so.1.0.0: undefined symbol: _ZTIN2gr7digital21packet_header_defaultE I wasnt able to solve this problem now for a few days already, and therefore, I was wondering, if anyone has an idea, how to solve that, since also google did not really help. If I need to provide any further information, I will of course do so (I just did not know, what else could be important for this). Thank you very much for your help. 😊 Kind regards, -- Sent from Gmail Mobile
