Cannot Build obs-midi-mg in Fedora.

[GraysonPeddie]

As there is not an RPM package, I tried to use alien to convert from deb to rpm which works fine, but I tried installing obs-midi-mg with the created .rpm file and I get package conflicts with filesystem.

So, I turned over to build obs-midi-mg from source. I did a cmake .. inside a build directory I created.

-- The C compiler identification is GNU 14.2.1
-- The CXX compiler identification is GNU 14.2.1
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at cmake/linux/defaults.cmake:63 (find_package):
  By not providing "FindLibObs.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "LibObs", but
  CMake did not find one.

  Could not find a package configuration file provided by "LibObs" with any
  of the following names:

    LibObsConfig.cmake
    libobs-config.cmake

  Add the installation prefix of "LibObs" to CMAKE_PREFIX_PATH or set
  "LibObs_DIR" to a directory containing one of the above files.  If "LibObs"
  provides a separate development package or SDK, be sure it has been
  installed.
Call Stack (most recent call first):
  CMakeLists.txt:15 (include)


-- Configuring incomplete, errors occurred!

Seems to me building from source with cmake is complicated for me. Can I please at least have a proper RPM package for installing obs-midi-mg?

Thank you.

[InfoSec812]

I just cloned on Fedora 41 today and was able to start building with the following:

mkdir ../obs-midi-build
cmake -DQT_VERSION=5 -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_INSTALL_PREFIX=/usr -S ${PWD} -B ../obs-midi-build
cd ../obs-midi-build
make

But I get a different error:

[ 22%] Building CXX object libremidi/CMakeFiles/libremidi.dir/include/libremidi/writer.cpp.o
/home/dphillips/Documents/Personal/Workspace/obs-midi-mg/libremidi/include/libremidi/writer.cpp: In member function ‘void libremidi::writer::write(std::ostream&) const’:
/home/dphillips/Documents/Personal/Workspace/obs-midi-mg/libremidi/include/libremidi/writer.cpp:205:30: error: conversion from ‘int’ to ‘uint16_t’ {aka ‘short unsigned int’} may change value [-Werror=conversion]
  205 |   util::write_uint16_be(out, ticksPerQuarterNote);
      |                              ^~~~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
make[2]: *** [libremidi/CMakeFiles/libremidi.dir/build.make:216: libremidi/CMakeFiles/libremidi.dir/include/libremidi/writer.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:142: libremidi/CMakeFiles/libremidi.dir/all] Error 2
make: *** [Makefile:156: all] Error 2

[InfoSec812]

Turning off CMAKE_COMPILE_WARNING_AS_ERROR lets me get a little further until I get this error:

In file included from /home/dphillips/Documents/Personal/Workspace/obs-midi-mg/src/actions/../mmg-utils.h:20,
                 from /home/dphillips/Documents/Personal/Workspace/obs-midi-mg/src/actions/../mmg-message.h:22,
                 from /home/dphillips/Documents/Personal/Workspace/obs-midi-mg/src/actions/mmg-action.h:22,
                 from /home/dphillips/Documents/Personal/Workspace/obs-midi-mg/src/actions/mmg-action.cpp:19:
/home/dphillips/Documents/Personal/Workspace/obs-midi-mg/src/actions/../obs-midi-mg.h:22:10: fatal error: QObject: No such file or directory
   22 | #include <QObject>
      |          ^~~~~~~~~

Looks like it's not finding the QT headers... Investigating.

[InfoSec812]

OK, adding -DENABLE_QT=ON to the cmake command is getting me further, but I am seeing a LOT of warnings...

[InfoSec812]

And it seems to be working... Here's what I did and my current concerns:

1. Clone the repo
2. Change to the repo directory
3. Create a dir, outside of the source dir, where the build is done (e.g. mkdir /tmp/obs-midi-mg-build)
4. Run cmake with the following params:

   cmake -DCMAKE_COMPILE_WARNING_AS_ERROR=OFF -DENABLE_QT=ON -DCMAKE_BUILD_TYPE=linux-ci-x86_64 -DCMAKE_INSTALL_PREFIX=/usr -S ${PWD} -B /tmp/obs-midi-mg-build
   

5. Change to the build dir (e.g. /tmp/obs-midi-mg-build)
6. Run make
7. Run sudo make install

As to my concerns, there are a LOT of warnings during the build and under normal circumstances the -Werror would prevent these from completing... Perhaps there is something which can be done via the profiles, but I am not conversant enough to know how to fix this.