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[Discuss-gnuradio] JIT integration and undefined symbol

From: Corentin Basler
Subject: [Discuss-gnuradio] JIT integration and undefined symbol
Date: Tue, 9 Jul 2019 14:39:35 +0200 (CEST)

Hello everyone,

I'm actually doing my bachelor thesis about Just In Time compiler and I want to integrate this technology in GNURadio. I've already created OOT module with integrated JIT functionality. I'm now trying to add an in-tree module. I'm trying to do that by copying the dvbt viterbi decoder block. The JIT compiler that I use is : ClangJIT . For testing, I use the example dvbt_rx_8k. I’m working from the maint-3.7 branch. I added my new block and replace the original viterbi decoder in the example. Unfortunately, when running the application, I have the following error :


Traceback (most recent call last):

File "/home/pacco/TB/gnuRadio_perf/dvbt_rx_demo_8k_jit.py", line 21, in <module>

from gnuradio import dtv

File "/opt/gnuradioClangJit/lib/python2.7/dist-packages/gnuradio/dtv/__init__.py", line 34, in <module>

from dtv_swig import *

File "/opt/gnuradioClangJit/lib/python2.7/dist-packages/gnuradio/dtv/dtv_swig.py", line 17, in <module>

_dtv_swig = swig_import_helper()

File "/opt/gnuradioClangJit/lib/python2.7/dist-packages/gnuradio/dtv/dtv_swig.py", line 14, in swig_import_helper

return importlib.import_module(mname)

File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module


ImportError: /opt/gnuradioClangJit/lib/libgnuradio-dtv- undefined symbol: _ZN2gr3dtv29dvbt_viterbi_decoder_jit_impl28dvbt_viterbi_get_output_sse2IXdtdefpT12d_ntracebackEEEhPDv2_xS4_Ph


I’ve already search in the mailing list for solution, but all the solution that I’ve found are for OOT module.

When running c++filt, I get the following result :


unsigned char gr::dtv::dvbt_viterbi_decoder_jit_impl::dvbt_viterbi_get_output_sse2<(*this).d_ntraceback>(long long __vector(2)*, long long __vector(2)*, unsigned char*)


Which is the result I wanted to see.

I use the following cmake command when building from source :


cmake -DCMAKE_C_COMPILER=/opt/release/llvm/bin/clang -DCMAKE_CXX_COMPILER=/opt/release/llvm/bin/clang++ -DPYTHON_EXECUTABLE=/usr/bin/python2 -DPYTHON_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython2.7.so -DCMAKE_INSTALL_PREFIX=/opt/gnuradioClangJit -DJIT_ENABLE=ON -DENABLE_GR_UHD=OFF ../

CMAKE_C_COMPILER and CMAKE_CXX_COMPILER points to the llvm version with clangJIT (see link above). JIT_ENABLE enable the flags for the JIT compiler.


Every change that I’ve made are on the following git (and commit ): https://github.com/Pacco1217/gnuradio/commit/14d656e5aecc998bb1cda9259de8a639dabf6d04 


About the computer :

Kernel : 4.18.0-25-generic

OS : Ubuntu 18.10

Does anyone has already faced the same difficulties or having a possible solution to this problem ? 


Thanks in advance for your answers,

Basler Corentin

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