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I am implementing a convolutional encoder-decoder OOT Module in GNU Radio 3.8 in C++.

When running the python tests I've written for the encoder and decoder, I get the following error:

ImportError: undefined symbol: _ZN2gr5a3sat13conv_dec_impl9generatorE

The generator variable is declared in the conv_dec_impl header file as:

inline static const bool generator[2][7] = {{1, 0, 0, 1, 1, 1, 1}, {1, 1, 0, 1, 1, 0, 1}}

Also, in the tests' python file, when importing a3sat_swig, I get this error: No module named 'a3sat_swig'

Could it be related to the CMakeLists file?

Any help is welcome.

Efthymia
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  • Welcome to StackOverflow! In case you are working on an open source project share a link to it. – Vasil Velichkov Sep 23 '21 at 15:57
  • Please search for the error message. It's easy to find out what causes "undefined symbol" and subsequest Python `ImportError` exception. Concerning your actual question, please extract a [mcve], which will give you the answer. – Ulrich Eckhardt Sep 23 '21 at 17:58

1 Answers1

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The generator variable is declared in the conv_dec_impl header file as:

inline static const bool generator[2][7] = {{1, 0, 0, 1, 1, 1, 1}, {1, 1, 0, 1, 1, 0, 1}}

Move the generator definition to the .cpp file. Also make sure you don't have a previous version of your OOT block that lacks this symbol already installed.

Also, in the tests' python file, when importing a3sat_swig, I get this error: No module named 'a3sat_swig'

Open python/__init__.py and either change ImportError to ModuleNotFoundError or remove the try and except. See issue 4761

Could it be related to the CMakeLists file?

No, most probably is not related to CMakeLists file.

Vasil Velichkov
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  • I actually just tried moving the ```generator``` definition to the ```.cpp``` file and it worked. Also changed this in the ```python/__init__.py```. Thanks for your help! – Efthymia Sep 23 '21 at 16:00