[Mesa-dev] Meson configuration for bare-bones osmesa

[Dylan Baker]

Quoting Chuck Atkins (2019-01-15 11:17:43)
> I'm jumping into Meson land now and I'm trying to configure the most recent
> release, 18.3.1, to build a minimal OSMesa containing only softpipe.  So I'm
> trying to make sure everything is explicitly disabled and only turning on the
> few pieces I need:
> 
> 
>     meson -Ddebug=false -Degl=false -Dgbm=false -Dopengl=true -Dgles1=false
>     -Dgles2=false -Dglvnd=false -Dgallium-nine=false -Dgallium-omx=disabled
>     -Dgallium-opencl=disabled -Dgallium-va=false -Dgallium-vdpau=false
>     -Dgallium-xa=false -Dgallium-xvmc=false -Dplatforms=surfaceless
>     -Dgallium-drivers=swrast -Dosmesa=gallium -Dllvm=false -Dglx=disabled
>     -Ddri-drivers= build
> 
> 
> But I end up with the following error:
> 
>     meson.build:393:4: ERROR:  Problem encountered: building dri or gallium
>     drivers require at least one window system
> 
> 
> Am I doing something wring here?  It looks like the meson build isn't properly
> dealing with the dependencies of the software rasterizers since you should be
> able to build a libOSMesa.so with only software rasterizers, i.e. softpipe,
> llvmpipe, and swr, without requiring any windowing system.
> 
> ----------
> Chuck Atkins
> Staff R&D Engineer, Scientific Computing
> Kitware, Inc.
> (518) 881-1183

That looks more like an error check that is too greedy. More likely that should
be a check of something like (psuedo code ahead):
`if not (osmesa or any_window_system)`

I'll send a patch.

Dylan
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