content: -----------------------------------------------------------------------------
  -- |
  -- Module      :  Distribution.Simple.Program.Strip
  --
  -- Maintainer  :  cabal-devel@haskell.org
  -- Portability :  portable
  --
  -- This module provides an library interface to the @strip@ program.
  
  module Distribution.Simple.Program.Strip (stripLib, stripExe)
         where
  
  import Distribution.Simple.Program (ProgramConfiguration, lookupProgram
                                     ,rawSystemProgram, stripProgram)
  import Distribution.Simple.Utils   (warn)
  import Distribution.System         (Platform(..), OS (..), buildOS)
  import Distribution.Verbosity      (Verbosity)
  
  import Control.Monad               (unless)
  import System.FilePath             (takeBaseName)
  
  runStrip :: Verbosity -> ProgramConfiguration -> FilePath -> [String] -> IO ()
  runStrip verbosity progConf path args =
    case lookupProgram stripProgram progConf of
      Just strip -> rawSystemProgram verbosity strip (path:args)
      Nothing    -> unless (buildOS == Windows) $
                    -- Don't bother warning on windows, we don't expect them to
                    -- have the strip program anyway.
                    warn verbosity $ "Unable to strip executable or library '"
                                     ++ (takeBaseName path)
                                     ++ "' (missing the 'strip' program)"
  
  stripExe :: Verbosity -> Platform -> ProgramConfiguration -> FilePath -> IO ()
  stripExe verbosity (Platform _arch os) conf path =
    runStrip verbosity conf path args
    where
      args = case os of
         OSX -> ["-x"] -- By default, stripping the ghc binary on at least
                       -- some OS X installations causes:
                       --     HSbase-3.0.o: unknown symbol `_environ'"
                       -- The -x flag fixes that.
         _   -> []
  
  stripLib :: Verbosity -> Platform -> ProgramConfiguration -> FilePath -> IO ()
  stripLib verbosity (Platform _arch os) conf path = do
    case os of
      OSX -> -- '--strip-unneeded' is not supported on OS X, iOS or
             -- Solaris. See #1630.
             return ()
      IOS -> return ()
      Solaris -> return ()
      Windows -> -- Stripping triggers a bug in 'strip.exe' for
                 -- libraries with lots identically named modules. See
                 -- #1784.
                 return()
      _   -> runStrip verbosity conf path args
    where
      args = ["--strip-unneeded"]
  