#13604: regression in ghc 8.2.1-rc1 (8.2.0.20170404) -------------------------------------+------------------------------------- Reporter: George | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 8.2.1-rc1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by ezyang): In principle, one ought to be able to pass `-O2` to GHCi to make this happen. However, it turns out you also must pass `-fobject-code`, at which the desired behavior is seen. {{{ ezyang@sabre:~$ ghc-8.2 -O2 -c A.hs ezyang@sabre:~$ ghc-8.2 -O2 -c A.hs -dynamic ezyang@sabre:~$ ghc-8.2 --interactive -O2 when making flags consistent: warning: -O conflicts with --interactive; -O ignored. GHCi, version 8.2.0.20170413: http://www.haskell.org/ghc/ :? for help Prelude> :load A.hs [1 of 1] Compiling A ( A.hs, interpreted ) [flags changed] Ok, modules loaded: A. *A> Leaving GHCi. ezyang@sabre:~$ ghc-8.2 --interactive -O2 -fobject-code GHCi, version 8.2.0.20170413: http://www.haskell.org/ghc/ :? for help Prelude> :load A.hs Ok, modules loaded: A (A.o). Prelude A> }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13604#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler