Re: Looking for insight into gr-iio for plutosdr

[Chris Gorman]

Hello again,

I believe I have found my solution.  At least it fixes the segfault.

Adding

add_definitions(-DBOOST_CHRONO_HEADER_ONLY)

to the CMakeLists.txt file in upgrade-3.8 branch of gr-iio allows me
to import iio from python without error.

I would like to thank https://gist.github.com/DonOregano for the fix.
It is in one of his trees.

Chris

On Sat, Apr 11, 2020 at 8:41 PM Chris Gorman <address@hidden> wrote:
>
> Hello All,
>
> I am trying to install gr-iio to build the needed libraries for a
> plutosdr.  I have a slightly unique situation in that I am running on
> a linux from scratch machine and as a result uses shared libraries
> when possible.  I have followed the instructions on
> https://wiki.analog.com/resources/tools-software/linux-software/gnuradio
> , except I am using the upgrade-3.8 branch of gr-iio.  In order to get
> cmake to run, I need to pass -DBUILD_SHARED_LIBS=ON to cmake.  This
> causes a small problem with the resulting binaries.  When I try to
> load them I get errors.  A simple import of iio in Python causes a
> segfault.
>
> Python 3.7.4 (default, Dec 21 2019, 10:53:28)
> [GCC 9.2.0] on linux
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import iio
> Fatal Python error: Segmentation fault
>
> Current thread 0x00007fbf14c7a740 (most recent call first):
>   File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
>   File "<frozen importlib._bootstrap_external>", line 1043 in create_module
>   File "<frozen importlib._bootstrap>", line 583 in module_from_spec
>   File "<frozen importlib._bootstrap>", line 670 in _load_unlocked
>   File "<frozen importlib._bootstrap>", line 967 in _find_and_load_unlocked
>   File "<frozen importlib._bootstrap>", line 983 in _find_and_load
>   File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
>   File "<frozen importlib._bootstrap>", line 1035 in _handle_fromlist
>   File "/opt/gnuradio/lib/python3.7/dist-packages/iio/iio_swig.py",
> line 13 in <module>
>   File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
>   File "<frozen importlib._bootstrap_external>", line 728 in exec_module
>   File "<frozen importlib._bootstrap>", line 677 in _load_unlocked
>   File "<frozen importlib._bootstrap>", line 967 in _find_and_load_unlocked
>   File "<frozen importlib._bootstrap>", line 983 in _find_and_load
>   File "/opt/gnuradio/lib/python3.7/dist-packages/iio/__init__.py",
> line 36 in <module>
>   File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
>   File "<frozen importlib._bootstrap_external>", line 728 in exec_module
>   File "<frozen importlib._bootstrap>", line 677 in _load_unlocked
>   File "<frozen importlib._bootstrap>", line 967 in _find_and_load_unlocked
>   File "<frozen importlib._bootstrap>", line 983 in _find_and_load
>   File "<stdin>", line 1 in <module>
> Segmentation fault
>
> When I try to run iio_swig.py from within gdb I get an error
> indicating that linking has gone wrong somehow.
>
> (gdb) run /opt/gnuradio/lib/python3.7/dist-packages/iio/iio_swig.py
> Starting program: /usr/bin/python3
> /opt/gnuradio/lib/python3.7/dist-packages/iio/iio_swig.py
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib/libthread_db.so.1".
> Traceback (most recent call last):
>   File "/opt/gnuradio/lib/python3.7/dist-packages/iio/iio_swig.py",
> line 15, in <module>
>     import _iio_swig
> ImportError: /opt/gnuradio/lib/libgnuradio-iio.so...: undefined
> symbol: _ZN5boost6chrono12steady_clock3nowEv
> [Inferior 1 (process 10709) exited with code 01
>
> _ZN5boost6chrono12setady_clock3nowEv exists in
> /usr/lib/libboost_chrono.so , but that library is not used by gr-iio
> as far as I can see.  (I can't find
> _ZN5boost6chrono12setady_clock3nowEv in any of the requested
> libraries: date_time; program_options; filesystem; system; regex;
> thread; unit_test_framework.)
>
> I'm attaching my build.log in case the fix can be found by perusing
> it.  (It hasn't helped me yet.)  Any ideas on how to fix my problem
> would be appreciated.
>
> Thanks in advance.
>
> Chris