Porting to DragonFly BSD

[Simon Marlow]

On 06/11/2009 23:25, Goetz Isenmann wrote:
> On Wed, Nov 04, 2009 at 03:08:27PM +0000, Colin Adams wrote:
>> When GHC 6.12.1 is released, I'm going to have a go at porting it to
>> DragonFly BSD (32-bit incarnation). Is the porting page on the
>> wikiup-to-date?
>
> Maybe you could start with something like:
>
> $ curl -o ghc-6.10.4-3.tar.bz2 \
> ;   http://www.goetz-isenmann.de/dfly/ghc-6.10.4-3.tar.bz2
> $ curl -o cabal http://www.goetz-isenmann.de/dfly/cabal
> $ tar xzf ghc-6.10.4-3.tar.bz2 -C /var/tmp/isenmann
> $ PATH=/var/tmp/isenmann/ghc-6.10.4-3/bin:$PATH
> $ ./cabal update
> $ ./cabal install --user cabal-install
>
> I have just recompiled this ghc with itself using the attached
> patches and --prefix=/var/tmp/isenmann on dragonfly 2.4.1 (32bit).
>
> The patches are only a stupid "do the same for dragonfly as for
> freebsd" with two exceptions AFAIR: (a) use -pthread not -lthr, and
> (b) this -D_POSIX_VERSION=199309 in rts/Makefile, that's most probably
> the wrong way to fix a (can't remember the details) build problem.
>
> Until now I had no time and energie to dig deeper into the problem
> [1], that looks to me, like rts/Linker cannot load any object file
> that references errno.
>
> My guess is, that for dragonflys "extern __thread int errno;" we do
> not only need to add a new case in rts/Linker.c but also need to
> generate different code for this thread local storage access.

Great work.  I've added Dragonfly BSD to the list of Tier 2 platforms: 
http://hackage.haskell.org/trac/ghc/wiki/Platforms

Would you be willing to be the maintainer for GHC on Dragonfly?

We should get these patches into GHC.  Most of them look 
straightforward, but I'm slightly suspicious of this:

-STANDARD_OPTS += -DCOMPILING_RTS
+STANDARD_OPTS += -DCOMPILING_RTS -D_POSIX_VERSION=199309

why was that necessary?

Cheers,
	Simon