midiout build error

[benstigsen]

Hi! Before I say this I should probably mention that I'm on Solus OS, so I have cloned the sonic-pi repo and I'm starting to build it.

During ./linux-prebuild.sh I get the following error:

/home/benstigsen/Downloads/sonic-pi/app/external/sp_midi/src/midiout.cpp: In member function ‘void MidiOut::send(const std::vector<unsigned char>*)’:
/home/benstigsen/Downloads/sonic-pi/app/external/sp_midi/src/midiout.cpp:62:28: error: invalid conversion from ‘const std::vector<unsigned char>*’ to ‘std::vector<unsigned char>*’ [-fpermissive]
   62 |     m_midiOut->sendMessage(msg);
      |                            ^~~
      |                            |
      |                            const std::vector<unsigned char>*
In file included from /home/benstigsen/Downloads/sonic-pi/app/external/sp_midi/src/midiout.h:29,
                 from /home/benstigsen/Downloads/sonic-pi/app/external/sp_midi/src/midiout.cpp:24:
/usr/include/rtmidi/RtMidi.h:561:67: note:   initializing argument 1 of ‘void RtMidiOut::sendMessage(std::vector<unsigned char>*)’
  561 | inline void RtMidiOut :: sendMessage( std::vector<unsigned char> *message ) { ((MidiOutApi *)rtapi_)->sendMessage( message ); }
      |                                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
gmake[5]: *** [CMakeFiles/libsp_midi.dir/build.make:107: CMakeFiles/libsp_midi.dir/src/midiout.cpp.o] Error 1
gmake[4]: *** [CMakeFiles/Makefile2:86: CMakeFiles/libsp_midi.dir/all] Error 2
gmake[3]: *** [Makefile:94: all] Error 2
gmake[2]: *** [CMakeFiles/sp_midi.dir/build.make:86: sp_midi-prefix/src/sp_midi-stamp/sp_midi-build] Error 2
gmake[1]: *** [CMakeFiles/Makefile2:99: CMakeFiles/sp_midi.dir/all] Error 2
gmake: *** [Makefile:91: all] Error 2

What do I do?

from: https://in-thread.sonic-pi.net/t/midiout-build-error/6336

[ethancrawford]

Hey @benstigsen, thanks for raising this ticket 🙂

[ethancrawford]

C++ development isn't my strong point, but my guess here is that there is maybe some sort of conflict with rtmidi versions. Are you able to find out what version of the rtmidi development files you have got installed on your system? (it might be called something like librtmidi-dev).

[benstigsen]

My rtmidi-dev version is 2.1.1-6.
From 2021-06-15

[samaaron]

We have improved our build process - especially for Linux - in addition to a complete overhaul of how we boot the system.
Therefore, please feel free to re-open if this is still an issue with the recently released v4 of Sonic Pi - https://github.com/sonic-pi-net/sonic-pi/releases