Fix parallel make for libffi.

[ghc-hetmet.git] / libraries / ifBuildable.hs

diff --git a/libraries/ifBuildable.hs b/libraries/ifBuildable.hs
index 011ecb7..68b6197 100644 (file)
--- a/libraries/ifBuildable.hs
+++ b/libraries/ifBuildable.hs
@@ -1,31 +1,40 @@
+-- Returns exitcode 0 if the given package is buildable or is a boot package,
+-- and 1 otherwise.
 
 module Main (main) where
 
 import Control.Monad
-import System.Cmd
 import System.Directory
 import System.Environment
 import System.Exit
+import System.IO
 
 main :: IO ()
 main = do args <- getArgs
           case args of
-              [] ->
-                  error "No package or command given"
-              [_] ->
-                  error "No command given"
-              package : prog : progArgs ->
-                  do setCurrentDirectory package
-                     unbuildable <- doesFileExist "unbuildable"
-                     if unbuildable
-                        then do mustBeBuildables <- getMustBeBuildablePackages
-                                when (package `elem` mustBeBuildables)
-                                     (error (package ++ " is unbuildable"))
-                        else do ec <- rawSystem prog progArgs
-                                exitWith ec
+              [packagesFile, package] ->
+                  doit packagesFile package
+              _ ->
+                  error "Syntax: ifBuildable <packages-file> <package>"
 
-getMustBeBuildablePackages :: IO [String]
-getMustBeBuildablePackages
- = do xs <- readFile "../core-packages"
-      return $ filter ("readline" /=) $ lines xs
+doit :: FilePath -> String -> IO ()
+doit packagesFile package
+ = do setCurrentDirectory package
+      unbuildable <- doesFileExist "unbuildable"
+      if not unbuildable
+         then exitWith ExitSuccess
+         else do mustBeBuildables <- getMustBeBuildables packagesFile
+                 if package `elem` mustBeBuildables
+                     then exitWith ExitSuccess
+                     else do hPutStrLn stderr "Warning: Package is unbuildable"
+                             exitWith (ExitFailure 1)
+
+getMustBeBuildables :: FilePath -> IO [String]
+getMustBeBuildables packagesFile
+ = do xs <- readFile packagesFile
+      let nonCommentLines = filter (("#" /=) . take 1) $ lines xs
+          requiredLines = filter ((3 == ) . length) $ map words nonCommentLines
+          requiredLibraries = [ x | 'l':'i':'b':'r':'a':'r':'i':'e':'s':'/':x
+                                    <- map head requiredLines ]
+      return $ filter ("editline" /=) requiredLibraries