GRC version 3.9.0.0 git master (python 3.8.2) + OOT blocks

[David Taylor (manx.net)]

Hi,

 

I have been developing a number of direct spread spectrum OOT blocks as part of a research project.

 

Working blocks were originally developed using GRC 3.7.11, however I wish to move forward and have installed and persevered so far with GRC 3.9 from the master branch.

 

The GRC, UHD, CMAKE (3.16) pybind11 (2.4.3) and other dependencies have been installed and build correctly. 

 

I have chosen to migrate the (3.7.11) C++ blocks and for completeness of the build process checking, have included a simple python OOT.

The C++ to python code binding, make and install under Ubuntu 20.04 all work and the new blocks import correctly to flow-graph using modified .yml descriptors.

 

1). GRC 9.0 works standalone from git-master install and with the UHD, in my case a B210.

2). OOT blocks including the aforementioned python OOT block all fail at import. In my case ModuleNotFoundError: No module named ‘development’

i.e. failure of ‘import development’ in the flow-graph python script

 

3). I have tried and retained the library workarounds with PYTHONPATH and LD_LIBRARY_PATH, but these now seem irrelevant as the GRC basically loads and runs.

 

4). I have looked at the gr_modtool  __init_.py file for indicators as to why both python and C++ blocks (using python bindings) both fail.

The inability of python 3.8.2 in my case to resolve the import is clearly at its core.

 

5). The OOT GRC blocks themselves import correctly into the flow-graph produce error free python script and all have relatively primitive interfaces.

 

Many thanks,

 

David Taylor