Segfault on OS X in GHCi when using GHC API

[nominolo]

(This might be related to #5072.)

I get a segfault when loading and running the following simple program in GHCi:

import GHC
import DynFlags

main = do
  defaultErrorHandler defaultDynFlags $ do
    (a,b) <- parseStaticFlags []
    print "42"

$ ghci -package ghc bug3.hs
GHCi, version 7.0.2: http://www.haskell.org/ghc/  :? for help

Ok, modules loaded: Main.
Prelude Main> main
Bus error

It works fine on x86-64 linux or when I compile the code. I have not tested whether it fails on x86 as well.

[igloo]

This is probably the same as #5031.

[igloo]

I can reproduce this with 7.0.4:

*Main> main
Bus error: 10

but not with the 7.2.1 release build, nor (after changing defaultDynFlags to defaultLogAction) with my HEAD validate build.

So I think this is fixed, although I don't know by what change.