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

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

Charlie Li <[email protected]> changed:

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--- Comment #3 from Charlie Li <[email protected]> ---
(In reply to Helge Oldach from comment #2)
> It's not needed for anything else. Broadly speaking, if you don't have a
> Radeon card or don't need acceleration, it's just bloat.
> 
LLVM is actually needed for *non-accelerated* graphics, particularly with
LLVMpipe. Many desktop environments/toolkits expect some sort of acceleration
anymore (even if you don't think it does), and LLVMpipe and the like provide
that software rendering.

> (Besides I'm kind of puzzled why we don't simply use the base system's LLVM
> which for 12-STABLE and above is already LLVM80. Maybe just my lack of
> understanding.)
-RELEASEs don't change the toolchain originally available upon release, so for
12.0-RELEASE, LLVM is fixed at 6.0.0. Besides, the base system LLVM is built as
static libraries and binaries, and some LLVM components not needed/useful to
build the base system are stripped away. Think, the base system uses a compiler
toolchain *based on LLVM*, in the same way that the base system GCC isn't
vanilla either.

I won't hesitate to post this wiki page again:
https://wiki.freebsd.org/WhyDoIHaveToBuildLLVMWhenIAlreadyHaveClangInstalled

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