[Mesa-stable] [PATCH] swr: [rasterizer jitter] fix llvm >= 7 build break

[Chuck Atkins]

Hi Dylan,

>          xswr)
> >              llvm_require_version $LLVM_REQUIRED_SWR "swr"
> > +            llvm_add_default_components "swr"
> > +            if test $LLVM_VERSION_MAJOR -ge 7; then
> > +                llvm_add_component "ipo" "swr"
> > +                llvm_add_component "ObjCARCOpts" "swr"
>
> Presumably this should be added to the meson build as well? There's an
> "llvm_modules" array around line 1170.
>

I'm not quite sure how to add this.  The additional modules are only
required for LLVM >= 7.  From the implementation in meson.build, it looks
like the required llvm_modules are assembled and then used  the llvm
dependency is searched for.  It seems a bit of chicken-egg problem in that
I don't know if the extra modules are required until after I know the llvm
version, but I need the required modules to dertime the llvm version.
Suggestions?

Thanks,
- Chuck
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