Edit New issue Building current ghc HEAD fails with globalRegMaybe not defined for this platform
ghc-stage1: panic! (the 'impossible' happened)
(GHC version 7.9.20140906 for arm-apple-ios):
globalRegMaybe not defined for this platform
Patch is at https://phabricator.haskell.org/D208 already.
A similar bug for non-registers builds was raised as #9055 (closed)