failure of GHC 7.0.4 on OS X

[Duncan Coutts]

On Mon, 2011-10-03 at 22:50 -0700, Mark Lentczner wrote:
> Here's where I am:
> 
> Today I managed to build a 32-bit version HP 2011.3.0.0 (based on GHC 7.0.4
> from GHC central). This installs and runs on 10.6 and 10.7 (with some tweaks
> applied to the ghc script). It will not run on 10.5 because the executables
> in the GHC distro (ghc, cabal, etc...) were not built compatible with
> 10.5[1].

Thanks very much for working on this.

> I'm pretty sure I will be able to build a 64-bit version as well, subject to
> the same caveats. I have some scripting magic to take care of things I had
> to do by hand, and I want to put the prior-version uninstaller in this
> release. But then I'm good to go.
> 
> So - I suggest we proceed, and abandon 10.5 for this release.

Ok. Is 10.5 still popular? I presume we'll need to flag this up on the
download page and direct 10.5 users to the previous HP release.

> In the future, we should try get the GHC build to work as far back as
> 10.5 for 32-bit builds.

Is there anything that the upstream ghc devs need to fix or be aware of?

> Also - I have some patches to the haskell-platform repo -- changing the
> .cabal file isn't quite enough, the versions appear a few other places as
> well. I can send Duncan a patch file, or you can add me to the proper group
> on code.haskell.org (I'm MtnViewMark there) so I can push over ssh.

Done. You should now be able to push over ssh.

> [1] The executables die with
>     dyld: unknown required load command 0x80000022
> A little bit of googling yields that this is indicative of being compiled
> with in an environment where the default SDK and min version were 10.6. To
> change requires linking with:
>     -mmacosx-version-min=10.5
> (and possibly compiling against the 10.5 SDK, though that shouldn't be
> needed since the GHC build should use nothing from the 10.6 SDK that isn't
> in the 10.5 SDK.)

So is this something the ghc devs need to fix in the osx build scripts?
Given this info, would it be easy enough for an OSX hacker to prepare
and test a patch for the ghc build system? Perhaps we can find a
volunteer to try this. We noticed at the recent Haskell Implementors
Workshop that most of the Haskell hackers in the room were now OSX
users, so we ought to be able to find volunteers.

Duncan