-#!/usr/bin/env runhaskell
-\begin{code}
-{-# OPTIONS -Wall -cpp #-}
-
-import Control.Monad
-import Distribution.PackageDescription
-import Distribution.Simple
-import Distribution.Simple.LocalBuildInfo
-import Distribution.Simple.Utils
-import System.Cmd
-import System.FilePath
-import System.Exit
-import System.Directory
-import Control.Exception
-
-main :: IO ()
-main = do
- let hooks = simpleUserHooks {
- buildHook = build_primitive_sources
- $ buildHook simpleUserHooks
- }
- defaultMainWithHooks hooks
-\end{code}
-
-Mostly snarfed from ghc-prim's Setup.hs.
-
-\begin{code}
-type Hook a = PackageDescription -> LocalBuildInfo -> UserHooks -> a -> IO ()
-
-
--- Hack: If PrimEnv.hs exists *and* genprimopcode or
--- primops.txt doesn't exist, don't rebuild PrimEnv.hs
-
-build_primitive_sources :: Hook a -> Hook a
-build_primitive_sources f pd lbi uhs x
- = do when (compilerFlavor (compiler lbi) == GHC) $ do
- let genprimopcode = joinPath ["..", "..", "utils",
- "genprimopcode", "genprimopcode"]
- primops = joinPath ["..", "..", "compiler", "prelude",
- "primops.txt"]
- primhs = joinPath ["Language", "Core", "PrimEnv.hs"]
- primhs_tmp = addExtension primhs "tmp"
- primEnvExists <- doesFileExist primhs
- genprimopcodeExists <- doesFileExist genprimopcode
- primopsExists <- doesFileExist primops
- unless (primEnvExists && not genprimopcodeExists && not primopsExists) $ do
- maybeExit $ system (genprimopcode ++ " --make-ext-core-source < "
- ++ primops ++ " > " ++ primhs_tmp)
- maybeUpdateFile primhs_tmp primhs
- maybeExit $ system ("make -C lib/GHC_ExtCore")
- f pd lbi uhs x
-
--- Replace a file only if the new version is different from the old.
--- This prevents make from doing unnecessary work after we run 'setup makefile'
-maybeUpdateFile :: FilePath -> FilePath -> IO ()
-maybeUpdateFile source target = do
- r <- rawSystem "cmp" ["-s" {-quiet-}, source, target]
- case r of
- ExitSuccess -> removeFile source
- ExitFailure _ -> do
-#if __GLASGOW_HASKELL__ >= 610
- (try :: IO () -> IO (Either IOException ()))
-#else
- try
-#endif
- (removeFile target)
- renameFile source target
-\end{code}
\ No newline at end of file