Re: gnuradio compilation and also gr-air-modes issue

The error message is due to trying to compile an OOT (gr-air-modes)
that's using GNU Radio 3.8 on your install of GNU radio 3.9.

There is a branch on gr-air-modes called "gr3.9" that looks like it
could work, although the commit messages say "WIP with plenty of
untested code". To switch to that branch:

git checkout gr3.9

As for the compile taking longer with -j, this usually means you don't
have enough memory. GNU Radio requires about 1 GB per core.

Ron

On 11/7/21 6:59 PM, lists@lazygranch.com wrote:
> Yes I know this list is specifically for gnuradio. I just compiled
> 3.9.0.4 from source (github) on opensuse 15.2 and all went well. When I
> ran the "make test" it seemed a bit slow then I realized I forgot to
> specify the number of CPUs (the j option). Doing a "make clean" then
> the properly flaged make the compilation took way longer. Just an
> observation but very interesting. Next time I do a build I will save
> the single CPU results from the 2cpu test for comparison.
>
> Regarding compilation of code in general (not specific to gnuradio) I
> have noticed with gcc10 a number of compilations bomb due to changes in
> the compiler. Thus far I have been able to edit my way (change
> compiler flags) out of the problem using tips found on the internet.
> Just something to be on the lookout for.
>
> Now regarding gr-air-modes I did file an "issue" on github but I
> figured I would run the error past the hive because maybe it is another
> fix that can been done with editing.
>
> Here is the error:
>
> [ 11%] Building CXX object lib/CMakeFiles/air_modes.dir/preamble_impl.cc.o
> /usr/local/src/gr-air-modes/lib/preamble_impl.cc: In static member function 'static gr::air_modes::preamble::sptr gr::air_modes::preamble::make(float, float)':
> /usr/local/src/gr-air-modes/lib/preamble_impl.cc:38:38: error: could not convert 'gnuradio::get_initial_sptr(T*) [with T = gr::air_modes::preamble_impl]()' from 'std::shared_ptr<gr::air_modes::preamble_impl>' to 'gr::air_modes::preamble::sptr' {aka 'boost::shared_ptr<gr::air_modes::preamble>'}
> 38 | return gnuradio::get_initial_sptr(new air_modes::preamble_impl(channel_rate, threshold_db));
> | ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> | |
> | std::shared_ptr<gr::air_modes::preamble_impl>
> make[2]: *** [lib/CMakeFiles/air_modes.dir/build.make:80: lib/CMakeFiles/air_modes.dir/preamble_impl.cc.o] Error 1
> make[1]: *** [CMakeFiles/Makefile2:286: lib/CMakeFiles/air_modes.dir/all] Error 2
> make: *** [Makefile:158: all] Error 2
>
>