Gr-fosphor. builds OK, throws runtime error

GNU Radio
1

Ubuntu 14.04.
Have updated to gnuradio 3.7.5git-194-g76a271ac, seems to run fine.

I rebuilt / reinstalled gr-fosphor. No problems with the build. The
location of Nvidia’s OpenCL library
changed from Ubuntu 13.10 to 14.04. The cmake command was:

cmake …/
-DOPENCL_LIBRARY=/usr/lib/x86_64-linux-gnu/libnvidia-opencl.so.1

cmake and make complete successfully.

The QT fosphor block shows up in Gnuradio Companion OK. When trying to
run, I get the following error:

from gnuradio import fosphor
File
“/usr/local/lib/python2.7/dist-packages/gnuradio/fosphor/init.py”,
line
45, in
from fosphor_swig import *
File
“/usr/local/lib/python2.7/dist-packages/gnuradio/fosphor/fosphor_swig.py”,
line 28, in
_fosphor_swig = swig_import_helper()
File
“/usr/local/lib/python2.7/dist-packages/gnuradio/fosphor/fosphor_swig.py”,
line 24, in swig_import_helper
_mod = imp.load_module(’_fosphor_swig’, fp, pathname, description)
ImportError: /usr/local/lib/libgnuradio-fosphor-3.7.0git.so.0.0.0:
undefined symbol: clBuildProgram

The version of gr-fosphor (which git tells me is the latest) is:
Revision: 9aea19a
Author: Sylvain M.
Date: 2014-07-24 22:34:07
fosphor: Allow operation without CL/GL sharing extension

Any advice?

– Tom, N5EG

2

cmake …/ -DOPENCL_LIBRARY=/usr/lib/x86_64-linux-gnu/libnvidia-opencl.so.1

That’s not correct.

libnvidia-opencl.so.1 is the backend driver. You need to link against
the ICD loader which should be named libOpenCL.so

Cheers,

Sylvain
3

Thank you, Manaut. That indeed was my problem, it runs fine making
that
change.

gr-fosphor is such an incredibly useful tool, it’s painful to do
without.

– Tom, N5EG

4

Thank you Sylvain. Apologies for misspelling your name.

– Tom, N5EG