#8836: ghc 7.6.3 and 7.4.2 hang on -O2 --------------------------------------------+------------------------------ Reporter: tsuraan | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Resolution: duplicate | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC doesn't work at all | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Changes (by thoughtpolice): * status: new => closed * resolution: => duplicate Comment: Right, then we know what's wrong. Unfortunately, there isn't really a good 'fix' that's possible to backport to fix `SpecConstr` for 7.6 users - in the mean time, you'll have to get by with `-O1` or (`-O2 -fno-spec- constr`, I suppose). Alternatively, you can also try tuning the constructor specialisation threshold as noted in #7944. There won't be a 7.6.4 release, and as this is fixed in HEAD, I'm marking this as a duplicate. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8836#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler