Add GHC.Prim to exposedModules in the Haddock 0.x hook

[ghc-base.git] / Setup.hs

diff --git a/Setup.hs b/Setup.hs
index 79c60e9..2ad48a4 100644 (file)
--- a/Setup.hs
+++ b/Setup.hs
@@ -13,20 +13,18 @@ import Distribution.Simple.LocalBuildInfo
 import Distribution.Simple.Utils
 import System.Cmd
 import System.FilePath
+import System.Exit
+import System.Directory
+import Control.Exception (try)
 
 main :: IO ()
 main = do let hooks = defaultUserHooks {
                   buildHook = build_primitive_sources
-                            $ filter_modules_hook
                             $ buildHook defaultUserHooks,
                   makefileHook = build_primitive_sources
-                               $ filter_modules_hook
                                $ makefileHook defaultUserHooks,
                   haddockHook = build_primitive_sources
-                               $ filter_modules_hook
-                               $ haddockHook defaultUserHooks,
-                   instHook = filter_modules_hook
-                           $ instHook defaultUserHooks }
+                               $ haddockHook defaultUserHooks }
           defaultMainWithHooks hooks
 
 type Hook a = PackageDescription -> LocalBuildInfo -> UserHooks -> a -> IO ()
@@ -40,19 +38,22 @@ build_primitive_sources f pd lbi uhs x
                                   "primops.txt"]
               primhs = joinPath ["GHC", "Prim.hs"]
               primopwrappers = joinPath ["GHC", "PrimopWrappers.hs"]
+              primhs_tmp = addExtension primhs "tmp"
+              primopwrappers_tmp = addExtension primopwrappers "tmp"
           maybeExit $ system (genprimopcode ++ " --make-haskell-source < "
-                           ++ primops ++ " > " ++ primhs)
+                           ++ primops ++ " > " ++ primhs_tmp)
+          maybeUpdateFile primhs_tmp primhs
           maybeExit $ system (genprimopcode ++ " --make-haskell-wrappers < "
-                           ++ primops ++ " > " ++ primopwrappers)
+                           ++ primops ++ " > " ++ primopwrappers_tmp)
+          maybeUpdateFile primopwrappers_tmp primopwrappers
       f pd lbi uhs x
 
-filter_modules_hook :: Hook a -> Hook a
-filter_modules_hook f pd lbi uhs x
- = let lib' = case library pd of
-                  Just lib ->
-                      let ems = filter ("GHC.Prim" /=) (exposedModules lib)
-                      in lib { exposedModules = ems }
-                  Nothing -> error "Expected a library"
-       pd' = pd { library = Just lib' }
-   in 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 try (removeFile target); renameFile source target