[Mesa-dev] [Bug 111016] Building Mesa GLX with Meson for macOS fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111016

            Bug ID: 111016
           Summary: Building Mesa GLX with Meson for macOS fails
           Product: Mesa
           Version: 19.1
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: GLX
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: mjbauer95 at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

When switching from using autotools to meson, we get an error in building Mesa
for macOS. This is happening in Nixpkgs master. These are the flags:

```
meson flags:
  --buildtype=plain
  --libdir=/nix/store/...-mesa-19.1.1/lib
  --libexecdir=/nix/store/...-mesa-19.1.1/libexec
  --bindir=/nix/store/...-mesa-19.1.1/bin
  --sbindir=/nix/store/...-mesa-19.1.1/sbin
  --includedir=/nix/store/...-mesa-19.1.1-dev/include
  --mandir=/nix/store/...-mesa-19.1.1/share/man
  --infodir=/nix/store/...-mesa-19.1.1/share/info
  --localedir=/nix/store/...-mesa-19.1.1/share/locale
  -Dauto_features=enabled
  -Dwrap_mode=nodownload
  --prefix=/nix/store/...-mesa-19.1.1
  --sysconfdir=/etc
  -Db_ndebug=true
  -Ddisk-cache-key=/nix/store/...-mesa-19.1.1-drivers
  -Ddri-search-path=/run/opengl-driver/lib/dri
  -Dplatforms=x11
  -Ddri-drivers=
  -Dgallium-drivers=
  -Dvulkan-drivers=
  -Ddri-drivers-path=/nix/store/...-mesa-19.1.1-drivers/lib/dri
  -Dvdpau-libs-path=/nix/store/...-mesa-19.1.1-drivers/lib/vdpau
  -Dxvmc-libs-path=/nix/store/...-mesa-19.1.1-drivers/lib
  -Domx-libs-path=/nix/store/...-mesa-19.1.1-drivers/lib/bellagio
  -Dva-libs-path=/nix/store/...-mesa-19.1.1-drivers/lib/dri
  -Dd3d-drivers-path=/nix/store/...-mesa-19.1.1-drivers/lib/d3d
  -Dgallium-vdpau=true
  -Dgallium-xvmc=true
  -Dgallium-opencl=disabled
  -Dshared-glapi=true
  -Dgles1=true
  -Dgles2=true
  -Dglx=dri
  -Dglvnd=true
  -Dllvm=true
  -Dshared-llvm=true
  -Dglx-direct=true 
```

Full log is available here: https://hydra.nixos.org/build/95553754

We want to build "appledri" which provides GLX symbols around Apple's
OpenGL.framework. As far as I can tell, this is fully supported with autotools,
but appears broken in Meson. The error comes from this line in Mesa:

https://gitlab.freedesktop.org/mesa/mesa/blame/19.1/meson.build#L367

As far as I know, there are no OpenGL drivers for macOS available from Mesa, so
enabling any of those does not appear to be an option. GLX is the main thing we
want to build here, so I think the above condition is incorrect. I can't find
any other way to do this (macports is still on an older).

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