#10560: -f and -O options interact in non-obvious, order dependent ways -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Incorrect Unknown/Multiple | warning at compile-time Test Case: | Blocked By: Blocking: | Related Tickets: Differential Revisions: | -------------------------------------+------------------------------------- The `-O[012]` and `-f*` flags are both implemented by manipulating a set of flags in `DynFlags`. These manipulations occur in the order that the flags occur in the command line. This leads to some rather surprising behavior. For instance, if the user wants to compile with optimization but specifically wants to disable specialisation, they might enter `-fno- specialise -O1`. This, however, would not do what the user expects as `-O1` implies `-fspecialise`, overriding the first flag. This is surprising and poorly documented behavior at best. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10560 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler