PSA: GHC can now be built with Clang

[Carter Schonwald]

Yes.  We have some direct contacts with the llvm apple dev team.  Austin
and or I will be following up with them soon.

On Wednesday, June 26, 2013, Manuel M T Chakravarty wrote:

> Austin Seipp <aseipp at pobox.com <javascript:;>>:
> > * HEAD will correctly work with Clang 3.4svn on both Linux, and OS X.
> > * I have a small, 6-line patch to Clang to fix the build failure in
> > primitive (Clang was too eager to stringify something.) Once this fix
> > is integrated into Clang (hopefully very soon,) it will be possible to
> > build GHC entirely including all stage2 libraries without any patches.
> > The patch is here: http://llvm.org/bugs/show_bug.cgi?id=16371 - I am
> > hoping this will also make it into XCode 5.
>
> Xcode 5 DP2's tools are still based on 3.3svn.
>
> > As for the infamous ticket #7602, the large performance regression on
> > Mac OS X, I have some numbers finally between my fast-TLS and slow-TLS
> > approach.
> >
> > ./gc_bench.slow-tls 19 500000 5 22 +RTS -H180m -N7 -RTS  395.57s user
> > 173.18s system 138% cpu 6:50.71 total
> >
> > vs
> >
> > ./gc_bench.fast-tls 19 500000 5 22 +RTS -H180m -N7 -RTS  322.98s user
> > 132.37s system 132% cpu 5:44.65 total
> >
> > Now, this probably looks totally awful from a scalability POV. And,
> > well, yeah, it is. But I am almost 100% certain there is something
> > extremely screwy going on with my machine here. I base this on the
> > fact that during gc_bench, kernel_task was eating up about ~600% of my
> > CPU consistently, giving user threads no time to run. I've noticed
> > this with other applications that were totally unrelated too (close
> > tweetbot -> 800% CPU usage,) so I guess it's time to learn DTrace. Or
> > turn it on and off again or something. Ugh.
> >
> > Anyway, if you look at the user times, you get a nice 30% speedup
> > which is about what we expect!
>
> I'm very glad to hear that!
>
> Manuel
>
>
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