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[ghc-hetmet.git] / compiler / utils / Util.lhs

diff --git a/compiler/utils/Util.lhs b/compiler/utils/Util.lhs
index 1d11b90..7057d32 100644 (file)
--- a/compiler/utils/Util.lhs
+++ b/compiler/utils/Util.lhs
@@ -6,7 +6,8 @@
 
 \begin{code}
 module Util (
-        debugIsOn,
+        ghciSupported, debugIsOn, ghciTablesNextToCode, picIsOn,
+        isWindowsHost, isWindowsTarget, isDarwinTarget,
 
         -- general list processing
         zipEqual, zipWithEqual, zipWith3Equal, zipWith4Equal,
@@ -93,7 +94,7 @@ import FastTypes
 #endif
 
 import Control.Monad    ( unless )
-import SYSTEM_IO_ERROR as IO ( catch, isDoesNotExistError )
+import System.IO.Error as IO ( catch, isDoesNotExistError )
 import System.Directory ( doesDirectoryExist, createDirectory,
                           getModificationTime )
 import System.FilePath hiding ( searchPathSeparator )
@@ -106,17 +107,59 @@ infixr 9 `thenCmp`
 
 %************************************************************************
 %*                                                                      *
-\subsection{-DDEBUG}
+\subsection{Is DEBUG on, are we on Windows, etc?}
 %*                                                                      *
 %************************************************************************
 
 \begin{code}
+ghciSupported :: Bool
+#ifdef GHCI
+ghciSupported = True
+#else
+ghciSupported = False
+#endif
+
 debugIsOn :: Bool
 #ifdef DEBUG
 debugIsOn = True
 #else
 debugIsOn = False
 #endif
+
+ghciTablesNextToCode :: Bool
+#ifdef GHCI_TABLES_NEXT_TO_CODE
+ghciTablesNextToCode = True
+#else
+ghciTablesNextToCode = False
+#endif
+
+picIsOn :: Bool
+#ifdef __PIC__
+picIsOn = True
+#else
+picIsOn = False
+#endif
+
+isWindowsHost :: Bool
+#ifdef mingw32_HOST_OS
+isWindowsHost = True
+#else
+isWindowsHost = False
+#endif
+
+isWindowsTarget :: Bool
+#ifdef mingw32_TARGET_OS
+isWindowsTarget = True
+#else
+isWindowsTarget = False
+#endif
+
+isDarwinTarget :: Bool
+#ifdef darwin_TARGET_OS
+isDarwinTarget = True
+#else
+isDarwinTarget = False
+#endif
 \end{code}
 
 %************************************************************************
@@ -202,7 +245,12 @@ zipWith4Equal msg _ _  _  _  _  =  panic ("zipWith4Equal: unequal lists:"++msg)
 
 zipLazy :: [a] -> [b] -> [(a,b)]
 zipLazy []     _       = []
-zipLazy (x:xs) ~(y:ys) = (x,y) : zipLazy xs ys
+-- We want to write this, but with GHC 6.4 we get a warning, so it
+-- doesn't validate:
+-- zipLazy (x:xs) ~(y:ys) = (x,y) : zipLazy xs ys
+-- so we write this instead:
+zipLazy (x:xs) zs = let y : ys = zs
+                    in (x,y) : zipLazy xs ys
 \end{code}
 
 
@@ -364,16 +412,6 @@ isn'tIn msg x ys
 # endif /* DEBUG */
 \end{code}
 
-foldl1' was added in GHC 6.4
-
-\begin{code}
-#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ < 604
-foldl1'          :: (a -> a -> a) -> [a] -> a
-foldl1' f (x:xs) =  foldl' f x xs
-foldl1' _ []     =  panic "foldl1'"
-#endif
-\end{code}
-
 %************************************************************************
 %*                                                                      *
 \subsubsection[Utils-Carsten-mergesort]{A mergesort from Carsten}