Path Quoting Issues on MSYS2 MinGW64 When Building OBS

Usage
1

CMake tries to run “C:msys64mingw64bincc.exe”. I’ve tried to set the compiler explicitly but no dice. Is that the solution and what is the proper way, or is there something else?

$ /mingw64/bin/cmake .. -GNinja -DQTDIR=DISABLE_UI
-- The C compiler identification is GNU 10.2.0
-- The CXX compiler identification is GNU 10.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - failed
-- Check for working C compiler: C:/msys64/mingw64/bin/cc.exe
-- Check for working C compiler: C:/msys64/mingw64/bin/cc.exe - broken
CMake Error at C:/msys64/mingw64/share/cmake-3.19/Modules/CMakeTestCCompiler.cmake:66 (message):
  The C compiler

    "C:/msys64/mingw64/bin/cc.exe"

  is not able to compile a simple test program.

  It fails with the following output:

    Change Dir: C:/Users/R0b0t1/Devel/obs-studio/build_mingw64/CMakeFiles/CMakeTmp

    Run Build Command(s):C:/msys64/usr/bin/ninja.exe cmTC_c467a && [1/2] Building C object CMakeFiles/cmTC_c467a.dir/testCCompiler.c.obj
    FAILED: CMakeFiles/cmTC_c467a.dir/testCCompiler.c.obj
    C:\msys64\mingw64\bin\cc.exe    -o CMakeFiles/cmTC_c467a.dir/testCCompiler.c.obj -c testCCompiler.c
    /bin/sh: C:msys64mingw64bincc.exe: command not found
    ninja: build stopped: subcommand failed.





  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:8 (project)


-- Configuring incomplete, errors occurred!
See also "C:/Users/R0b0t1/Devel/obs-studio/build_mingw64/CMakeFiles/CMakeOutput.log".
See also "C:/Users/R0b0t1/Devel/obs-studio/build_mingw64/CMakeFiles/CMakeError.log".
2

MinGW64 tools are windows tools, so they expect an environment supporting windows paths (i.e. with drive letter and backslashes).
You have to install the MinGW64 version of ninja (package mingw-w64-x86_64-ninja) to have a usable environment.