Ah, nevermind about the wiki edit. The use of pure virtual functions is already discussed in http://gnuradio.org/redmine/projects/gnuradio/wiki/BlocksCodingGuide . Still, the gr_modtool addition may be useful.
-----Original Message----- From: discuss-gnuradio-bounces+sean.nowlan=gtri.gatech....@gnu.org [mailto:discuss-gnuradio-bounces+sean.nowlan=gtri.gatech....@gnu.org] On Behalf Of Nowlan, Sean Sent: Wednesday, March 05, 2014 4:45 PM To: Marcus Müller; George Sklivanitis; GNURadio Discussion List Subject: Re: [Discuss-gnuradio] Problem with undefined symbol in new block created by gr_modtool in 3.7.2 The first place I'd look is in your_block.h. Did you remember to declare any public member functions to be pure virtual in that file, and then declare your (non-virtual) functions in your_block_impl.h? If you forgot to declare pure virtual functions, i.e., "virtual return_type your_block(args_list) = 0;" in your_block.h, it will compile but you will get the undefined symbol at runtime. This probably a common pitfall and it might be worth making a note in the wiki for OutOfTreeModules. I'll add that. Architects of gr_modtool... can you add an autogen comment in *.h files reminding the user to declare pure virtual functions? I think users who don't deeply understand OO and particularly its C++ syntax would benefit from this reminder. I think it's a common paradigm to use other examples to fill in the "guts" of gr_modtool generated C++ code, but things like this are easy to miss. Sean -----Original Message----- From: discuss-gnuradio-bounces+sean.nowlan=gtri.gatech....@gnu.org [mailto:discuss-gnuradio-bounces+sean.nowlan=gtri.gatech....@gnu.org] On Behalf Of Marcus Müller Sent: Wednesday, March 05, 2014 3:21 PM To: George Sklivanitis; GNURadio Discussion List Subject: Re: [Discuss-gnuradio] Problem with undefined symbol in new block created by gr_modtool in 3.7.2 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Hi George, This is a little unspecific. Most probably you have a problem similar to the fftw- related problem of activecat, but that's only guessing... Please heed http://gnuradio.org/redmine/projects/gnuradio/wiki/ReportingErrors when reporting errors. Greetings, Marcus On March 5, 2014 8:57:46 PM CET, George Sklivanitis <george.sklivani...@gmail.com> wrote: >Hello all, > >I am dealing with the problem of undefined symbol when trying to >execute a python script for testing my new custom block created in GNU >Radio 3.7.2. >I used gr_modtool for creating the new block and also followed the >instructions posted at > >http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModulesConf >ig > >for correctly configuring it but the problem still holds. > >Any ideas? > >Thanks, >-George > >-- >Sklivanitis Georgios > > >----------------------------------------------------------------------- >- > >_______________________________________________ >Discuss-gnuradio mailing list >Discuss-gnuradio@gnu.org >https://lists.gnu.org/mailman/listinfo/discuss-gnuradio - -- Sent from my Android device with K-9 Mail. Please excuse my brevity. -----BEGIN PGP SIGNATURE----- Version: APG v1.0.9 iQFABAEBCAAqBQJTF4c7IxxNYXJjdXMgTfxsbGVyIDxtYXJjdXNAaG9zdGFsaWEu ZGU+AAoJEBKNLRrpJvfojQoH/2a609iWLTsywtozQ+FcZkuQT6uCy13vX3n4b5k3 rTvy9QP3uHuHQkiRZHDbZoJ+mZ9kFOf6NeG20RGdf8i4yCB1AZ8F7uvvdi7CebXT sRQxoQE+8Vz5VS+faAStAOK3+tArdRGZOU2v3gTYXGCvATaeM3A+rxsNQ7LKPwM8 sI5KZ3xgvgikkObbFuo00MOaLA7tHzMttXxWjU5riXann1l1eOyGIzM1j0XO1gAD imofs0DfXHB4cE0Gi43E1gjjeqEW034dLZAS7w/c/Gq85Z0Ni+z1a35kS5UYvYhQ ndeEMqrLQv4ghCRnHR93ob+8YRlqMedVjDDeKQdjEh0D2jY= =27ny -----END PGP SIGNATURE----- _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
