#7978: Profiling broken --------------------------------------------+------------------------------ Reporter: gmainland | Owner: Type: bug | Status: new Priority: highest | Milestone: 7.8.1 Component: Compiler | Version: 7.7 Resolution: | 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: --------------------------------------------+------------------------------ Comment (by ezyang): My guess is cardinality analysis is tickling a latent bug in the code generator related to generating code for non-updatable thunks. If you disable cardinality analysis in the following way: {{{ diff --git a/compiler/stgSyn/CoreToStg.lhs b/compiler/stgSyn/CoreToStg.lhs index 1395c22..414a6d8 100644 --- a/compiler/stgSyn/CoreToStg.lhs +++ b/compiler/stgSyn/CoreToStg.lhs @@ -807,7 +807,7 @@ mkStgRhs rhs_fvs srt bndr binder_info rhs (getFVs rhs_fvs) upd_flag srt [] rhs where - upd_flag = getUpdateFlag bndr + upd_flag = Updatable {- SDM: disabled. Eval/Apply can't handle functions with arity zero very well; and making these into simple non-updatable thunks breaks other }}} I think the profiling build goes through as desired. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/7978#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler