#!/usr/bin/env runhaskell
\begin{code}
-{-# OPTIONS -Wall #-}
+{-# OPTIONS -Wall -cpp #-}
import Control.Monad
-import Data.List
import Distribution.PackageDescription
import Distribution.Simple
import Distribution.Simple.LocalBuildInfo
import System.FilePath
import System.Exit
import System.Directory
-import Control.Exception (try)
+import Control.Exception
main :: IO ()
main = do
- let hooks = defaultUserHooks {
+ let hooks = simpleUserHooks {
buildHook = build_primitive_sources
- $ buildHook defaultUserHooks
+ $ buildHook simpleUserHooks
}
defaultMainWithHooks hooks
\end{code}
\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
"primops.txt"]
primhs = joinPath ["Language", "Core", "PrimEnv.hs"]
primhs_tmp = addExtension primhs "tmp"
- maybeExit $ system (genprimopcode ++ " --make-ext-core-source < "
+ 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")
+ 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.
r <- rawSystem "cmp" ["-s" {-quiet-}, source, target]
case r of
ExitSuccess -> removeFile source
- ExitFailure _ -> do try (removeFile target); renameFile source target
-
-
+ 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