[Haskell-cafe] building ghc on arch linux ARM?

[Yves Parès]

Okay, thanks for the explanation.
But that does not completely answer the original question: now, using
branch 7 of GHC what can you do to get a haskell program compiled on/for an
ARM platform without using Debian? You have to use LLVM? So you have to
compile your program on a regular x86/x64 PC for LLVM backend and then use
that bytecode on your ARM platform, is that it? Is LLVM bytecode that
portable? I don't much about LLVM, so sorry if those questions feel a bit
dumb ;)
ghcarm speaks about the Pandaboard and LLVM in a post:
http://ghcarm.wordpress.com/2011/07/03/llvm-on-arm-testing

And thanks for the information about git-annex, I'm checking that out, it
looks interesting ;)
Actually, bottomline I would be interested in running a web app (preferably
using Yesod) on a Raspberry Pi (or similar, but more expensive), but this
use case is cool too.

Le 10 avril 2012 13:13, Joachim Breitner <mail at joachim-breitner.de> a écrit
:

> Hi,
>
> Am Dienstag, den 10.04.2012, 13:04 +0200 schrieb Yves Parès:
> > > All these are not cross-compiled, but natively
> > > compiled on the repective architecture, and I don’t think it is
> > easily
> > > possible to cross-compile GHC itself even today.
> >
> > So how did they get compiled the first time? How do you get a GHC
> > working on or for an ARM platform if you don't use Debian?
> > And why was Joey Hess talking about performance issues?
> > (I'll be eventually interested, as Graham Klyne suggested earlier, in
> > compiling for Raspberry Pi, if the hardware suits).
>
> well, GHC was more portable in version 6.8 and before (this is not
> cross-compiling, at least not really:
> http://hackage.haskell.org/trac/ghc/wiki/Building/Porting
>
> When I ported GHC to s390x half a year ago, I think I started with
> porting 6.8 and then kept building the next released version with the
> previous. It would be great, though, if porting current versions
> directly would become possible again.
>
> Most of these architectures do not have a native code generator (so they
> are compiled via C) and are unregisterized, i.e. GHC knows nothing about
> their registers. Both cause a performance penalty; I don’t know numbers.
> I assume this is what Joey refers to. But maybe also that ARM machines
> tend to be slower :-)
>
> I’m happily running git-annex on a NSLU2 (266MHz/23MB RAM ARM NAS
> device) and have done so before it was registerized, so it is definitely
> a useful target for Haskell.
>
> Greetings,
> Joachim
>
> --
> Joachim Breitner
>  e-Mail: mail at joachim-breitner.de
>  Homepage: http://www.joachim-breitner.de
>  Jabber-ID: nomeata at joachim-breitner.de
>
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