[Haskell-iPhone] GHC as a cross-compiler

[Simon Marlow]

I just wanted to mention that there's cross-compilation work going on in 
parallel on the GHC repo: Gabor Greif has been working on 
cross-compilation and Ian is currently working on integrating it.  I 
believe that everyone is working towards the same goal and so ultimately 
there shouldn't be any conflict, although it probably does mean that 
Stephen's work won't integrate cleanly with later GHC versions.

You guys should talk to each other ;-)

Cheers,
	Simon


On 18/11/2012 21:29, Stephen Blackheath [to GHC-iPhone] wrote:
> Stephen,
>
> The best starting point for our GHC-iOS compiler is
> https://github.com/ghc-ios/ghc/wiki
>
> Yes, the GHC wiki CrossCompilation page is a bit out of date. I had
> promised to fix it up, but I haven't yet.
>
> I've had some cross-compile related changes integrated into GHC HEAD,
> and they made it possible to build on a generic embedded Debian.
>
> There are some more changes that you'll find in GHC-iOS that are also
> needed for general cross compiling. About a week ago I decided to start
> getting these things integrated, but I haven't found the time just yet.
> So, very soon I'll be getting the more general changes pushed into GHC
> HEAD.
>
> Here is a very brief starting point. Here's our config.sh:
>
> . env.sh
> CPPFLAGS="$TARGET_CPPFLAGS" CFLAGS="$TARGET_CFLAGS"
> LDFLAGS="$TARGET_LDFLAGS" ./configure \
>      --with-local-gcc=/usr/bin/gcc \
>      --target=arm-apple-darwin10 \
>      --with-alien=`pwd`/alien \
>      --prefix=/usr/local/ghc-iphone/
>
> To turn on the cross compiler, you have to say (in our case)
> --target=arm-apple-darwin10
>
> You will also need to provide an alien script. What 'alien' does is to
> compile something for the target in such a way that we can run it
> locally. This can be using qemu, or by copying the executable over to a
> real system and capturing the console output. In our case, we compile it
> using the iPhone simulator compiler.
>
> As I mentioned, some of the patches in our ghc-ios repo you will need. I
> suggest you start by taking the diff between the ios branch and head. I
> am not very good at git yet so I can't tell you the exact command.
>
> As for "how complex is it"? If the architecture you're using is
> supported in GHC and the target is POSIX-based, the job should mostly
> involve applying some of the fixes in our repo, which are mostly
> makefile ones. (I don't know anything about the Blackberry.)
>
> These are basically the same patches I'll be trying to get integrated
> first, so you could wait for me to get some of that work done if you like.
>
>
> Steve
>
> On 18/11/12 05:07, Stephen Paul Weber wrote:
>> Hello all,
>>
>> I'm interested in getting a GHC cross-compiler going for the new
>> QNX-based BlackBerry 10 OS launching in the new year, but the
>> documentation on GHC as cross-compiler
>> <http://hackage.haskell.org/trac/ghc/wiki/CrossCompilation> is pretty
>> sparse and contradictory.  You guys seem to be doing it.  How complex is
>> it?  Where should I start looking for information about the
>> configuration I'll need in the build system, etc?  Do I need to know a
>> lot about autotools hacking to get anywhere?
>>
>> Thanks,
>>
>
> _______________________________________________
> iPhone mailing list
> iPhone at haskell.org
> http://www.haskell.org/mailman/listinfo/iphone