UHD: undefined symbol uhd_time_spec_t

GNU Radio
1

Hi all,

I’m having right now problems with a implementation of a time tag in a
block that I’m writing. I’m basically writing a burst tagger with SOB,
EOB
and TX_TIME tags. The first two are working, but the third (the one that
uses a UHD function), is giving me problems.

I recognized that the part that is not properly working is when I write
“uhd::time_spec_t”. I even tried to create an arbitrary variable by
writing
just “uhd::time_spec_t test;” in an arbitrary function and then ctest,
and
then I notice that there is problems with that, as the output says:

       " /$WORKING_DIR$/build/lib/libgnuradio-dyspan.so: undefined

symbol: _ZN3uhd11time_spec_tC1Ed"

Make and make install of my block run without any issue.

I have in the headers and body the necessary includes, such as
<sys/time.h>
and <uhd/types/time_spec.hpp>. I also added the UHD module in the
CMakeList.txt file and it is found, as I can see this in the output:

– Build type not specified: defaulting to release.
– Boost version: 1.54.0
– Found the following Boost libraries:
– filesystem
– system
– date_time
Checking for GNU Radio Module: RUNTIME

  • INCLUDES=/usr/local/include

LIBS=/usr/local/lib/libgnuradio-runtime.so;/usr/local/lib/libgnuradio-pmt.so
GNURADIO_RUNTIME_FOUND = TRUE
Checking for GNU Radio Module: UHD

  • INCLUDES=/usr/local/include

LIBS=/usr/local/lib/libgnuradio-uhd.so;/usr/local/lib/libgnuradio-runtime.so;/usr/local/lib/libgnuradio-pmt.so
GNURADIO_UHD_FOUND = TRUE
Checking for GNU Radio Module: PMT

  • INCLUDES=/usr/local/include

LIBS=/usr/local/lib/libgnuradio-runtime.so;/usr/local/lib/libgnuradio-pmt.so
GNURADIO_PMT_FOUND = TRUE

– Checking for module SWIG
– Found SWIG version 2.0.11.
– Configuring done
– Generating done
– Build files have been written to: /$WORKING_DIR$/build

I sincerely don’t know what am I missing. Maybe I’m skipping some
linking
steps, but I don’t know right now how to trace this. Any type of help
will
be welcomed.

Thanks in advance for your opinions,

Nicolas

2

Hi Nicolas,

so the good news is that you’re doing things right:
the CMake output contains this line:

Checking for GNU Radio Module: UHD
which indicates that you did a
set(GR_REQUIRED_COMPONENTS RUNTIME UHD PMT)
(or even more), so the libraries that CMake should link against are
being found.

You should check your gr-dyspan/lib/CMakeLists.txt; look for the lines
starting with
target_link_libraries(…
These should also include ${GNURADIO_ALL_LIBRARIES}.

Best regards,
Marcus

3

Hi Marcus,

You were right, I did the modifications on the CMakeList.txt file on the
working folder, but I forgot to go into the CMakeList.txt on tue lib/
folder. Now that I went thrhough the lib/CMakeList.txt and did the
proper
modificacions, the tests are passed and I can continue working.

Thank you very much for your time!

Best regards,
Nicolas

On Tue, May 19, 2015 at 10:50 AM, Marcus Müller
[email protected]