Make Parameters Help - add_library in cmakelists.txt

deepinthewoods

I'm trying to include the Cycfi Q Audio Lib in my project. I have cloned Q and infra into my bela project directory.
Right now my make parameters are as follows:

CPPFLAGS= -I/root/Bela/projects/qPitchSynth/q/q_lib/include -I/root/Bela/projects/qPitchSynth/infra/include -I/root/Bela/projects/qPitchSynth/q/q_io/include --std=c++14;

The errors I am getting now are all variations on:

/root/Bela/projects/qPitchSynth/render.cpp🙁.text+0x2c): undefined reference to `cycfi::q::port_audio_stream::port_audio_stream(unsigned int, unsigned int, int, int)'

Looking at the cMakeLists.txt file, it contains this:
add_library(
libqio
src/audio_file.cpp
src/audio_device.cpp
src/audio_stream.cpp
src/midi_device.cpp
src/midi_stream.cpp
)
...Which seems to be related (port_audio_stream is defined inside audio_stream.cpp). Adding LDLIBS=-llibqio to the make parameters gives an error "cannot find -llibqio"

Any help is appreciated!

giuliomoro

deepinthewoods Looking at the cMakeLists.txt file, it contains this:

that is CMakeLists of the library itself? Did you build the library? Do you have a file called libqio.so? Where is it? You need to tell Bela's Makefile to add the library, and where to find it. LDLIBS=-lqio (not llibqio, if the library is called libqio), only tells it to add that library, but unless it is in one of the standard places (e.g.: /usr/local/lib or /usr/lib), then it won't find it. You could add a -L flag to tell it where to look for it, but it's probably easier to install the libqio.so file in /usr/local/lib and then run ldconfig to rebuild the dynamic linker's cache.

deepinthewoods

Thanks for your help. I was trying to just have all the source inside my bela project but .so files sounds like a better idea. I tried to build the library with cmake but the one included with bela doesn't support c++17. So I installed the latest cmake from source, which took a few hours. Still not working (error: 'string_view' is not a member of 'std'). C++17 isn't supported by bela, right?

I'm gonna go ahead and give up for the time being. The project I'm trying to use is https://github.com/cycfi/Q, it would be pretty useful to have on bela. Anyway, thanks again.

giuliomoro

deepinthewoods C++17 isn't supported by bela, right?

the gcc that comes with Bela does support that, though clang doesn't.

I tried to build the library, and after hacking my way into convincing it to build it anyhow, it still fails at string_view. This was allegedly supported as experimental by g++-6.3 that is on the board, but including the experimental headers make the build crash in an even worse way. Replacing the one instance of std::string_view with std::string makes it work anyhow.

Interestingly, building it is not actually needed because

q_lib is a no-frills, lightweight, header-only library.

which means you should be able to use it without building anything, just point your project to the relevant includes, almost as you have done above:

CPPFLAGS= -I/root/Bela/projects/qPitchSynth/q/q_lib/include -I/root/Bela/projects/qPitchSynth/infra/include;

see if you still see C++17-related errors.

The issue you had with "undefined reference" was probably because as part of your project you had included the files from q_io which are not actually needed.

giuliomoro

deepinthewoods Am I right in thinking portmidi should work with bela?

never tried, but I would guess it does work, building on top of ALSA. portaudio wouldn't work instead.

giuliomoro The issue you had with "undefined reference" was probably because as part of your project you had included the files from q_io which are not actually needed.

what I meant here is that you do not actually need any of the q_io stuff when running on Bela, as the DSP library is all in q_lib. q_io is just for providing audio I/O but on Bela you just use the render file and the Midi class.

deepinthewoods

after deleting portaudio and portmidi from the source and cmakelists.txt, and just running an empty render.cpp my console shows:

Building project ...
Building midi_device.cpp...
Makefile:474: recipe for target '/root/Bela/projects/qPitchSynth/build/Q/q_io/src/midi_device.o' failed
Build finished
In file Q/q_io/src/midi_device.cpp: 'q_io/midi_device.hpp' file not found column: 10, line: 6
/root/Bela/projects/qPitchSynth/Q/q_io/src/midi_device.cpp:6:10: fatal error: 'q_io/midi_device.hpp' file not found
#include <q_io/midi_device.hpp>
^
1 error generated.
make: *** [/root/Bela/projects/qPitchSynth/build/Q/q_io/src/midi_device.o] Error 1
root@bela ~/Bela#

deepinthewoods

The q_io part need rewriting for bela anyway, so I'm gonna try compiling that on it's own...

deepinthewoods

Am I right in thinking portmidi should work with bela?

giuliomoro

@deepinthewoods any luck?

dealerpriest

I'm currently trying to make the Q library run on Bela. So far I haven't had any success.
First I tried to add the q library as a git submodule into my Bela project folder. I used the cpp flags you described above @giuliomoro

-m 'CPPFLAGS="-I/root/Bela/projects/myproject/Q/q_lib/include -I/root/Bela/projects/myproject/Q/infra/include"'

The compiler was complaining about:
No rule to make target pmwin.o

I had a feeling that it might be related to the compiler picking up on the CMakeList.txt files (but aren't they for windows, so maybe not?) or something similar . So I've cleaned the q folder to only host the q_lib and infra folders with their relevant hpp files.

Now I get a lot of cimpiling errors that I suspect is related to c++ version.
examples of errors:

error: statement not allowed in constexpr function
      while (*lhs || *rhs)

error: constexpr function never produces a constant expression [-Winvalid-constexpr]     
   constexpr float fast_tan(float x)

error: functions that differ only in their return type cannot be overloaded
      constexpr derived_type& derived();

I'm not sure how to successfully include and compile the q-library in a Bela project.

giuliomoro

dealerpriest Now I get a lot of cimpiling errors that I suspect is related to c++ version.
examples of errors:

Possibly a C++ version issue, yes. Can you send over the project you are trying to build?

giuliomoro

dealerpriest First I tried to add the q library as a git submodule into my Bela project folder. I used the cpp flags you described above @giuliomoro

I see: you are missing COMPILER=gcc. I added a working example here.

dealerpriest

Actually. I got it working with "-std=c++1z"

What would be the preferred way? The C++17 flag or the gcc flag?

dealerpriest

And also. Thx for all advice!