I am confused while reading http://ghc.haskell.org/trac/ghc/ticket/4012http://ghc.haskell.org/trac/ghc/ticket/8276 . What initially was filed as a difference in results from two identical compiler versions bootstrapped by two different compiler versions seems to morph into a discussion about API stability for differences in code, and various fixes that have been applied. What are the current requirements for getting deterministic builds? Alexander