Re: [Discuss-gnuradio] UHD: undefined symbol uhd_time_spec_t

[Marcus Müller]

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

On 05/19/2015 10:40 AM, Nicolas Cuervo Benavides wrote:

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

--

Nicolás Cuervo Benavides

Handy: +49 157 70476855

Electric and Electronic Engineering department.

Electronic Engineering

Universidad Nacional de Colombia

--

Student M.Sc. Information and Communication Technology

Karlsruher Institut für Technologie

Karlsruhe, Baden Würtemberg, Germany 

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