Re: [Discuss-gnuradio] Newbie quesion about building C++ blocks/SWIG/Python

[Marcus Müller]

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Hi Florian,

I'd, too, say that this is a linking problem.
Since the master thesis was written in the beginning of 2011, it's
most probably not compatible with GR 3.6., and that's why you had to
fix so much.
Furthermore, the project uses the now obsolete method of building OOT
blocks using automake/configure; native 3.6 modules use CMake.
It's not impossible that you can build an oot module for GR 3.6 using
automake, but I don't think it's worth the effort to fix the build
scripts.
My suggestion would be: use "gr_modtool newmod" to create a new oot
module (and don't name it "howto", which the original author forgot to
change), and use "gr_modtool add" to add all the blocks from the
original project, and copy&paste all the original code, replacing all
occurences of howto by your project name. Then you have a
well-structured, likely-to-work oot module.

Happy hacking,
Marcus

On 30.12.2013 18:11, Florian Student wrote:
> Hello experts, I'm trying to get a DAB receiver project running,
> found it at this address: 
> http://www.zsn.zhaw.ch/de/engineering/institute-zentren/zsn/projekte/gnu-radio.html
>
> 
After fighting with it for one day and after resolving multiple issues, I
> finally got "make" to run without problems. Now, when I run "make
> check", this is the error: make[2]: Entering directory
> `/root/grc/DAB/python' 
> /root/grc/DAB/lib:/root/grc/DAB/lib/.libs:/root/grc/DAB/swig:/root/grc/DAB/swig/.libs:/root/grc/DAB/python:/usr/local/lib/python2.7/dist-packages:/usr/local/lib/python2.7/dist-packages:
>
> 
Traceback (most recent call last):
> File "./qa_bondcut.py", line 25, in <module> import howto_swig File
> "/root/grc/DAB/swig/howto_swig.py", line 26, in <module> 
> _howto_swig = swig_import_helper() File
> "/root/grc/DAB/swig/howto_swig.py", line 18, in swig_import_helper 
> import _howto_swig ImportError:
> /root/grc/DAB/lib/.libs/libgnuradio-howto-3.3.0.so.0: undefined 
> symbol: _ZTI8gr_block In fact, this also happens for every other
> .py file that is included in the test. After a Google search, a few
> other people showed up, reporting the same error. From the comment
> section of 
> http://www.rtl-sdr.com/rtl-sdr-tutorial-analyzing-gsm-with-airprobe-and-wireshark/
>  I give you this snippet: "I encountered the same error on Kali
> Linux. The reason is, that the shared object (_gsm.o) doesn’t get
> correctly linked against gnuradio-core.so, because pkg-config fails
> during the build. It fails, because gnuradio-core depends on the
> package “fftw3f” which is installed in binary form, because
> otherwise gnuradio woulndn’t work, but the -dev package is mising. 
> Long story short: Install the missing package (apt-get install
> libfftw3-dev) and rebuild the gsm-receiver. Then it works." So I
> tried this, I installed the "libfftw3-dev-3.3.2-3.1 (64 bit)"
> package using the package manager. (I see that the regular version,
> "libfftw3-3-3.3.2-3.1" is also installed. Do these versions match,
> or do I need a newer dev version?) After "make clean", "configure"
> and "make", "make check" fails again, with the same error
> messages. As my system I'm using the newest version of 64-bit Kali
> Linux (Debian based), and I'm using GR 3.6.5.1, the version built
> from the Kali guys. I hope this is recent enough for you to give me
> some helpful tips. What do I have to do so that the libaries are
> correctly linked together? Is it something I have to change in the
> building process, or at the time the library is used from Python? I
> hope you can give me some advice, and want to thank you in advance
> for your time and attention! Florian
> 
> 
> 
> _______________________________________________ Discuss-gnuradio
> mailing list address@hidden 
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
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