#8528: Preprocessor issues building GHC HEAD on Mavericks ----------------------------------------+---------------------------------- Reporter: guest | Owner: Type: bug | Status: new Priority: high | Milestone: Component: Compiler | Version: 7.7 Resolution: | Keywords: clang Operating System: MacOS X | Architecture: x86_64 (amd64) Type of failure: Building GHC failed | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: #8480 ----------------------------------------+---------------------------------- Comment (by hvr): Replying to [comment:7 simonmar]:
I'm without a clue about what the problem is and how to fix it, and I don't have a Mac. Pull requests gladly accepted :-)
One of the problems is that tradional CPP has different semantics, GNU cpp has the `-Wtraditional` flag that warns about some problematic constructs which differ between traditional/non-traditional CPP mode, e.g. assume the following `foo.hs` file: {{{ #if __GLASGOW_HASKELL__ > 706 -- ... #endif }}} then `cpp -Wtraditional foo.hs` would explain that {{{ # 1 "foo.hs" foo.hs:1:3: warning: traditional C ignores #if with the # indented [-Wtraditional] #if __GLASGOW_HASKELL__ > 706 ^ foo.hs:3:3: warning: traditional C ignores #endif with the # indented [-Wtraditional] #endif ^ }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8528#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler