Re: Undefined symbol: zmq_strerror in OOT C++ block

[Johannes Demel]

Hi,

the error comes up when you try to `import satmisc_python`. This is the 
Pybind11 Bindings part of your module.

Fortunately, the bindings exist and are found. Also, the library 
`libgnuradio-satmisc.so` exists. This is the file where your blocks get 
compiled into.
However, this library is looking for a symbol `zmq_strerror` that it 
can't find. You probably didn't link your module against ZMQ.
This is probably missing in your module:
https://github.com/gnuradio/gnuradio/blob/78d89e1466864d305fbb8a5b25a7e1e94efc18c4/gr-zeromq/lib/CMakeLists.txt#L31

Cheers
Johannes

On 16.02.23 15:02, Guillermo Lena wrote:
> I have ported an OOT block from 3.8 to 3.10 by creating a new module and 
> block with gr_modtool in GNU Radio 3.10 and copying the 3.8 code into de 
> 3.10 corresponding files. I have built it with cmake .. make etc 
> successfully. This blocks involves CSP and ZMQ. When I run a flowgraph 
> where this block is, i get the following error:
>
> Traceback (most recent call last):
>    File "/home/gnuradio/persistent-folder/satlab/srs3_radio_lime.py", 
> line 38, in <module>
>      from gnuradio import satmisc
>    File 
> "/usr/local/lib/python3.10/dist-packages/gnuradio/satmisc/__init__.py", 
> line 18, in <module>
>      from .satmisc_python import *
> ImportError: 
> /usr/local/lib/x86_64-linux-gnu/libgnuradio-satmisc.so.1.0.0: undefined 
> symbol: zmq_strerror
>
> I do not know exactly where this error comes from and would much 
> apreciate any hints on how to fix this.

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