#1290: ghc runs preprocessor too much -------------------------------------+------------------------------------- Reporter: guest | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Driver | Version: 6.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): I think this is essentially impossible to fix. Along with the ''import'' dependencies, there are also the ''preprocessing'' dependencies. If I have {{{#!hs module Blah where #include Foo.h }}} then I need to preprocess `Blah.hs` any time `Foo.h` changes. But that means we need to know that `Blah.hs` depends on `Foo.h`. Without detailed knowledge of the preprocessor language, I don't see any way to determine this. I'm very tempted to close this ticket as invalid, but let's see if anyone disagrees. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/1290#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler