Hi Marcus, Thanks for your reply.
However, I do not understand it (I guess this is because I am a beginner). Sorry. I did not link my block to any gnuradio-blocks. And I have written nothing in my block’s QA file. Are you suggesting that I need to include more things at the beginning of my block’s CPP script? Best wishes, Shumin Yao. Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10 From: Marcus Müller<mailto:mmuel...@gnuradio.org> Sent: Tuesday, December 15, 2020 19:44 To: discuss-gnuradio@gnu.org<mailto:discuss-gnuradio@gnu.org> Subject: Re: Problem on calling the count_bits32() method Are you linking against gnuradio-blocks? You'll need something like (depends on your GNU Radio's OOT template how this looks exactly): target_link_libraries(gnuradio-yourmodulename gnuradio::gnuradio-runtime gnuradio::gr-blocks) On 15.12.20 10:38, Shumin Yao wrote: > Hi, > > > > I am writing a block that needs to call the gr::blocks::count_bits32() > method in its corresponding CPP script. At the beginning of the script, > I have added "#include <gnuradio/blocks/count_bits.h>". > > > > When I used the "make" command to compile the program, no errors occurred. > > > > However, when I typed the "ctest -V" command in the terminal to check > the compilation, the following error appeared: "ImportError: > /home/<my-path>/build/lib/libgnuradio-<my-module’s-name>.so: undefined > symbol: _ZN2gr6blocks12count_bits32Ej" > > > > Then, I typed the "c++filt _ZN2gr6blocks12count_bits32Ej" command in the > terminal and obtained an output: "gr::blocks::count_bits32(unsigned int)". > > > > Do you have any idea why I encounter this error? > > > > Best wishes, > > Shumin Yao. > > > > Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for > Windows 10 > > >
