#11270: "Unusable UNPACK pragma" warnings should be printed even without -O -------------------------------------+------------------------------------- Reporter: osa1 | Owner: Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.11 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by osa1): @thomie, it shouldn't get any slower - all the information is already there. (unless we end up forcing a thunk that otherwise wouldn't be forced. Even in this case there shouldn't be any measurable difference, the code is not doing anything fancy) @rwbarton, good point. I just tried using HEAD: {{{ ➜ ghc-stage1 -fno-code -fforce-recomp -Wall --make Main.hs [1 of 1] Compiling Main ( Main.hs, nothing ) ➜ ghc-stage1 -fforce-recomp -Wall --make Main.hs [1 of 1] Compiling Main ( Main.hs, Main.o ) Main.hs:6:1: warning: Pattern match(es) are non-exhaustive In an equation for ‘showD’: Patterns not matched: C Linking Main ... }}} I think ideally this shouldn't happen, but we should probably discuss this further in the mailing list. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11270#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler