@mark, theres no runtime detection logic patch, theres just a config time hack currently.

I've a work in progress partial patch to expose the CPP program choice + flags into the ghc settings file, https://ghc.haskell.org/trac/ghc/ticket/8683 , but lifes got me a bit overloaded these past few weeks so we need someone to "own" finishing it up (and i'm uncertain if i can hard allocate that time this week or next... i have some personal obligations that need take priority). That said, I may find up finding some time to whack on it more

point being, agreed, the wrapper hack aint ok :)

On Tue, Mar 4, 2014 at 9:57 AM, Mark Lentczner <mark.lentczner@gmail.com> wrote:

It looks like the Mac builds are specific to the version of Mac OS X they were compiled on. This is very unfortunate, as now we'll have to produce at least four variants of HP for each.

The only thing holding back a build on either Maverricks or Mountain Lion (10.9 and 10.8) from working on 10.7 ~ 10.9 is the set of flags passed to the c compiler. On a machine with only clang, these need three extra flags.

I had thought that there was a patch that allowed GCC to dynamically determine if it was working with clang, and if so, pass the extra flags. It didn't look like that patch made it in. I seem to have lost track of who did this patch and it's status. Carter: do you remember?

For the platform, I might be able to patch around this with a variant of my ghc-clang-wrapper script - beefing it up to remove those flags if not clang.

- Mark