Re: Undefined symbol _ZN2gr12msg_accepter4postEN5boost13intrusive_ptrIN3pmt8pmt_baseEEES5_

[Marcus Müller]

Hi John,

as discussed on chat: this happens if, and only if, you're linking at build 
time to a
different library than your runtime shared library loader finds.

The fix is simple: make sure you've *not* got two versions of GNU Radio around, 
one of
which your linker finds during building of gr-osmosdr, and a different one your 
ld.so finds.

Best regards,
Marcus


On 04.11.21 20:35, John Coppens wrote:
> Hi all.
> 
> I've been suffering trying to install gnuradio. I tried different versions, 
> and different
> combinations with gr-osmosdr, as I don't see a list of which versions go 
> together.
> 
> Using, eg. gr-osmosdr.so.0.2.0 and gnuradio-3.8.4.0, which I have compiled 
> successfully
> on my Slackware64-current system, I get an error at run-time:
> 
> Executing: /usr/bin/python3 -u /usr/local/projects/rf/gnuradio/VHF_NBFM.py
> 
> Traceback (most recent call last):
>   File "/usr/local/projects/rf/gnuradio/VHF_NBFM.py", line 40, in <module>
>     import osmosdr
>   File "/usr/lib64/python3.9/site-packages/osmosdr/__init__.py", line 25, in 
> <module>
>     from .osmosdr_swig import *
>   File "/usr/lib64/python3.9/site-packages/osmosdr/osmosdr_swig.py", line 13, 
> in <module>
>     from . import _osmosdr_swig
> ImportError: /usr/lib64/libgnuradio-osmosdr.so.0.2.0: undefined symbol: 
> _ZN2gr12msg_accepter4postEN5boost13intrusive_ptrIN3pmt8pmt_baseEEES5_
> 
> c++filt translates that symbol to 
> gr::msg_accepter::post(boost::intrusive_ptr<pmt::pmt_base>, 
> boost::intrusive_ptr<pmt::pmt_base>)
> 
> I have Python 3.9.5, Slackware64-current, librtlsdr installed and working 
> (the included
> codes runs fine). SWIG is version 4.0.2. 
> 
> The gr-osmosdr problem seems to be the only remaining issue.
> 
> Can anyone indicate me where to search? 
> 
> John
>