Re: Error pyepics with odroid / libca.so cannot open shared object file.

[Matt Newville via Tech-talk <tech-talk at aps.anl.gov>]

Hi Erwann, 

I answered this on GitHub too, but I think you probably need libca.so and libCom.so for aarch64 - these are dynamic libraries for Linux on x86_64 and Linux on arm, but not aarch64.  You may have to build those or find them in some auto-build system.   Once you find those two files, you can put them anywhere on your system (in the same folder) an environmental variable PYEPICS_LIBCA is the full path to that libca.so.

If you know where to find pre-built libraries for this, we could consider adding those to the pyepics distribution.

On Mon, Mar 27, 2023 at 6:57 AM LE-DANIEL Erwann via Tech-talk <tech-talk at aps.anl.gov> wrote:

Hello,

 

I tried hard to understand why pyepics doesn’t work on my odroid C4.

I installed python version 3.8 and last pyepics version3.5.1

 

Unfortunately, when I start python and after writing :

 

import epics

pv=epics.PV('VARIABLE')

 

The return was :

 

/home/odroid/.local/lib/python3.8/site-packages/epics/clibs/linux64/libca.so: cannot open shared object file: No such file or directory

 

But in reality, the file is in the linux64 folder : /home/odroid/.local/lib/python3.8/site-packages/epics/clibs/linux64/

 

I read in the page Downloading and Installation — Epics Channel Access for Python (uchicago.edu) that “ If these provided versions of libca do not work for you, please let us know. “ ..

Where can I find other libca versions ?

 

Many thanks.

 

My environment : Ubuntu mate 20.0, python 3.8 , pyepics 3.5.1, cpu archi aarch64, hardware : odroid C4.

 

Erwann.

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