Re: [Discuss-gnuradio] OOT module based on file_sink_base generates symbol not found error

[Johannes Demel]

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Hi Jose,

check correct linking with 'ldd /usr/local/libgnuradio-jmr.so'.
'libnguradio-blocks.so' should appear in the output with the correct path.

happy hacking
Johannes

On 06.02.2014 20:48, Jose Rodriguez wrote:
> 
> Guys,
> 
> This may be a beginner question, but here it goes. I have built
> several OOT modules for my own blocks using gr_modtool as indicated
> in the Out-of-tree tutorial w. great success. These blocks were
> subclasses of gr::blocks.
> 
> Now I have created a new block called file_format_sink very similar
> to file_sink whose parent class is gr::file_sink_base. It all
> builds fine but when I run a flowgraph with file_format_sink using
> grc, I get the following error:
> 
> Traceback (most recent call last): File
> "/home/joser/Desktop/Panorama/grc/top_block.py", line 24, in
> <module> import jmr File
> "/usr/local/lib/python2.7/dist-packages/jmr/__init__.py", line 45,
> in <module> from jmr_swig import * File
> "/usr/local/lib/python2.7/dist-packages/jmr/jmr_swig.py", line 26,
> in <module> _jmr_swig = swig_import_helper() File
> "/usr/local/lib/python2.7/dist-packages/jmr/jmr_swig.py", line 22,
> in swig_import_helper _mod = imp.load_module('_jmr_swig', fp,
> pathname, description) ImportError:
> /usr/local/lib/libgnuradio-jmr.so: undefined symbol: 
> _ZN2gr6blocks14file_sink_baseD2Ev
> 
>>>> Done
> 
> The missing symbol above, ...file_sink_base... is in 
> /usr/local/libgnuradio-blocks.so (actually in 
> libgnuradio-blocks-3.7.2.1.so.0.0.0) And I believe the above error
> is caused by not finding the right lib but I have tried many things
> including the suggestions in the FAQ (involving ldconfig and
> /etc/ld.so.conf) and I have searched in google with no luck.
> 
> I have looked at swig/jmr_swig.i and the module directory's 
> CMakeList.txt file and can't determine how Python's lib load path
> is set.
> 
> Does anyone have any suggestions on how to fix this? thanks,
> 
> Jose Rodriguez address@hidden
> <mailto:address@hidden>
> 
> 
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