[Bug 238906] graphics/mesa-dri: Allow building without LLVM

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238906

--- Comment #14 from Niclas Zeising <zeising at FreeBSD.org> ---
(In reply to Helge Oldach from comment #13)
> (In reply to Niclas Zeising from comment #10)
> > Changing the mesa ports to make llvm optional, even if possible, makes these > already quite complex ports even more complex, and adds further use cases to > test for.  All this requires more man power.
> 
> Glad to help out with a quick patch. Note this actually simplifies the
> --enable-llvm/--disable-llvm logic.

Hi!
Thank you for the patch.
Unfortunately, we won't be able to use it. LLVM is a hard dependency for the
radeonsi and amdgpu drivers. It's also required for llvmpipe, which is the
default software renderer and used by all desktops without a GPU.  Working
through all the dependencies for a mesa port without LLVM would be quite
complex.  Graphics is a complex area and to provide the best possible
experience for the vast majority of our users, we want to ensure all the
options we offer work.  Making LLVM optional would create a testing matrix that
is beyond our ability to even spot check, let alone ensure works for the
majority of all our users.  It would be an ongoing burden to the team with each
new mesa release, as which drivers use what bits of LLVM are constantly
changing. Taking all these factors into account, we're simple unable to support
making this optional at this time. We do not have the manpower for it.

Of course, you are welcome to continue using your patch, for as long as it
works, but you'll have to work out any issues that are caused by it.

Regards
Niclas Zeising
FreeBSD Graphics Team

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