I'm refreshing this one since I have a very similar problem. I'm trying to build gr on BeagleBone Black, which is also an ARMv7. I'm using the build-gnuradio script.
> [ 4%] Building C object volk/lib/CMakeFiles/volk.dir/volk_cpu.c.o > [ 4%] Building C object volk/lib/CMakeFiles/volk.dir/volk_machines.c.o > [ 4%] Building C object > volk/lib/CMakeFiles/volk.dir/volk_machine_generic_orc.c.o > [ 4%] Building C object > volk/lib/CMakeFiles/volk.dir/volk_machine_neon_hardfp_orc.c.o > Linking C shared library libvolk.so > [ 4%] Built target volk > [ 4%] Building CXX object volk/lib/CMakeFiles/test_all.dir/testqa.cc.o > [ 4%] Building CXX object volk/lib/CMakeFiles/test_all.dir/qa_utils.cc.o > Linking CXX executable test_all > 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: 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 > make failed > Exiting Gnu Radio build/install I've edited the cmake command in the script: cmake -DENABLE_BAD_BOOST=ON -DCMAKE_BUILD_TYPE=RelWithDebInfo $CMAKE_FLAG1 $CMAKE_FLAG2 $CMF1 $CMF2 -DCMAKE_C_FLAGS="-march=armv7-a -mthumb-interwork -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9" -DCMAKE_ASM-ATT_FLAGS="-march=armv7-a -mthumb-interwork -mfloat-abi=hard -mfpu=neon" ../ >>$LOGDEV 2>&1 Unfortunately, it had no effect. I'm out of ideas over here :/
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