Re: Import Error "undefined symbol"

[Philipp Niedermayer]

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" REQUIREDCOMPONENTS digital)|".

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*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.

    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,

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On Mon, Mar 20, 2023 at 4:59 AM Beckmann, Niklas <niklas.beckma...@rwth-aachen.de> wrote:

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