# Problems building GNURadio **URL:** \ **Category:** GNU Radio\ **Created:** [August 12, 2014, 2:52am UTC](https://www.ruby-forum.com/t/problems-building-gnuradio/231497 "2014-08-12T02:52:49Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [August 12, 2014, 2:52am UTC](https://www.ruby-forum.com/t/problems-building-gnuradio/231497/1 "2014-08-12T02:52:49Z")
Hi: I am having problems building gnuradio on armV7 that I cannot figure out. I am using pybombs. Here is a snapshot of the errors during the build: Built target pygen\_gr\_vocoder\_examples\_6232c [23%] Built target fcd\_swig\_swig\_doc [24%] Built target pygen\_gr\_fcd\_python\_fcd\_2e9af [24%] Built target wavelet\_swig\_swig\_doc [24%] Built target pygen\_gr\_wavelet\_python\_wavelet\_75fe3 [24%] Built target pygen\_gr\_wxgui\_grc\_ca707 [24%] Built target pygen\_gr\_wxgui\_python\_wxgui\_173e9 [24%] Built target pygen\_gr\_wxgui\_python\_wxgui\_c3702 [25%] Built target pygen\_gr\_wxgui\_python\_wxgui\_3f66f [25%] Built target wxgui\_swig\_swig\_doc Linking CXX executable test\_all Linking CXX executable volk-config-info …/lib/libvolk.so.0.0.0: undefined reference to `volk_16i_max_star_horizontal_16i_neonasm' ../lib/libvolk.so.0.0.0: undefined reference to`volk\_32fc\_x2\_multiply\_32fc\_neonasm’ …/lib/libvolk.so.0.0.0: undefined reference to `volk_32fc_32f_dot_prod_32fc_a_neonasm' ../lib/libvolk.so.0.0.0: undefined reference to`volk\_32f\_x2\_dot\_prod\_32f\_neonasm’ …/lib/libvolk.so.0.0.0: undefined reference to `volk_32f_x2_dot_prod_32f_neonasm_opts' ../lib/libvolk.so.0.0.0: undefined reference to`volk\_32fc\_32f\_dot\_prod\_32fc\_a\_neonpipeline’ collect2: error: ld returned 1 exit status make[2]: \*\*\* [volk/apps/volk-config-info] Error 1 make[1]: \*\*\* [volk/apps/CMakeFiles/volk-config-info.dir/all] Error 2 make[1]: \*\*\* Waiting for unfinished jobs… libvolk.so.0.0.0: undefined reference to `volk_32fc_x2_multiply_32fc_neonasm' libvolk.so.0.0.0: undefined reference to`volk\_16i\_max\_star\_horizontal\_16i\_neonasm’ libvolk.so.0.0.0: undefined reference to `volk_32fc_32f_dot_prod_32fc_a_neonasm' libvolk.so.0.0.0: undefined reference to`volk\_32f\_x2\_dot\_prod\_32f\_neonasm\_opts’ libvolk.so.0.0.0: undefined reference to `volk_32fc_32f_dot_prod_32fc_a_neonpipeline' libvolk.so.0.0.0: undefined reference to`volk\_32f\_x2\_dot\_prod\_32f\_neonasm’ collect2: error: ld returned 1 exit status make[2]: \*\*\* [volk/lib/test\_all] Error 1 make[1]: \*\*\* [volk/lib/CMakeFiles/test\_all.dir/all] Error 2 make: \*\*\* [all] Error 2 ERROR:root:PyBOMBS Make step failed for package (gnuradio) please see bash output above for a reason (hint: look for the word Error) aruntu@aruntu:~/pybombs$ Can anyone point me in the right direction? Thanks, Freddie ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [August 12, 2014, 3:41am UTC](https://www.ruby-forum.com/t/problems-building-gnuradio/231497/2 "2014-08-12T03:41:03Z")
On Mon, Aug 11, 2014 at 7:51 PM, Ed [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > [24%] Built target pygen\_gr\_wxgui\_python\_wxgui\_173e9 > ../lib/libvolk.so.0.0.0: undefined reference to > `volk\_32fc\_32f\_dot\_prod\_32fc\_a\_neonpipeline’ > collect2: error: ld returned 1 exit status > > * * * > > Discuss-gnuradio mailing list > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio) I’m not sure of the problem, except that I would expect this to happen if you did the following steps: 1. built GNU Radio from source roughly 3 weeks ago or later 2. updated to a new revision 3. run make without running cmake Do you see any files in the gnuradio $buildir/volk/lib/CMakeFiles/volk.dir/\_\_/kernels/volk/asm/neon/ ? You can try using pybombs clean gnuradio, and then try building again. Nathan ---
**Author:** ![casper\_the\_ghost](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/58956e/32.png) [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Post date:** [August 12, 2014, 3:37pm UTC](https://www.ruby-forum.com/t/problems-building-gnuradio/231497/3 "2014-08-12T15:37:38Z")
On Mon, Aug 11, 2014 at 9:39 PM, West, Nathan [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > [24%] Built target pygen\_gr\_wavelet\_python\_wavelet\_75fe3 > > `volk_32fc_x2_multiply_32fc_neonasm' make[1]: *** [volk/apps/CMakeFiles/volk-config-info.dir/all] Error 2 `volk\_32fc\_32f\_dot\_prod\_32fc\_a\_neonpipeline’ > > Can anyone point me in the right direction? > > Do you see any files in the gnuradio > $buildir/volk/lib/CMakeFiles/volk.dir/\_\_/kernels/volk/asm/neon/ ? > You can try using pybombs clean gnuradio, and then try building again. > > Nathan Native compiles don’t pick up the proper C and ASM flags. Here’s what I had to set to build natively on a Tegra: cmake [other options] -DCMAKE\_C\_FLAGS=“-march=armv7-a -mthumb-interwork -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9” -DCMAKE\_ASM-ATT\_FLAGS=“-march=armv7-a -mthumb-interwork -mfloat-abi=hard -mfpu=neon” I might have gone overboard with them, like it’s probably not necessary to tell the native C compiler what its arch is, but I mostly carried this over from our OE cross compiler work and it built and ran fine this way. Tom