Re: [Discuss-gnuradio] Runtime AttributeError for custom block

[Nicolas Cuervo]

Hi,

it is nice that you look for the error before posting, but does your module actually need the ITPP libraries? because that might have been something specific for the case that you quoted. 

To check if your problem is linking, first run the following command:

    $ sudo ldconfig

and then try to start again your application in GRC. 

If the problem persists, then you have to look for some required library which linking is not made properly. To check the linking you can run the "ldd" command on the generated shared object of your module (which, based on your email, is supposed to be called something like 'libgnuradio-a1System.so')

Regards,

- Nicolas

On Mon, Jul 10, 2017 at 6:31 AM, Vipin Sharma <address@hidden> wrote:

I have a Python flowgraph which instantiates a few custom blocks (written in C++). The flow graph generate is fine but when I try to run the program through GUI, I get attribute errors as shown below.

After researching a bit, I found out that one potential cause could be missing ITPP libraries as discussed in an old post here: https://lists.gnu.org/archive/html/discuss-gnuradio/2015-02/msg00158.html. 

I followed through suggested changes (adding following lines in my lib/CMakeList.txt). This doesn't seem to help at all; I don't see any extra libraries being included in the final a1System.so library under build/lib/ after the 'make build'. This likely implies I am still missing a critical step for the custom blocks in C++. Any ideas how I can proceed?

Excerpt from lib/CMakeList.txt file:

list(APPEND a1System_libs

 ${GNURADIO_ALL_LIBRARIES}

 ${ITPP_LIBRARIES}

)

target_link_libraries(gnuradio-a1System ${Boost_LIBRARIES} ${a1System_libs})

Runtime Log from GRC:

File "/home/vipin/a1/grc/a1-rfe+mimo/gr-a1System/build/top_block.py", line 234, in <module>
main() 
File "/home/vipin/a1/grc/a1-rfe+mimo/gr-a1System/build/top_block.py", line 222, in main
tb = top_block_cls()
File "/home/vipin/a1/grc/a1-rfe+mimo/gr-a1System/build/top_block.py", line 164, in __init__
self.a1System_TargetDetector_cf_0 = a1System.TargetDetector_cf(512, 10, 1024, 2, 5, 1, 1, 1, 1)
AttributeError: 'module' object has no attribute 'TargetDetector_cf'

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