X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Futils%2FUtil.lhs;h=af811104762c0fb7fc99252ee6755dc2a9945514;hb=8ffd91b6102f4ad3111cabdf6bdb1998f257887f;hp=83d7cc8241ce1397b25127373914f4f9eedcb47a;hpb=09c5039866fcd4f58424cb40f67049a373d98055;p=ghc-hetmet.git

diff --git a/compiler/utils/Util.lhs b/compiler/utils/Util.lhs
index 83d7cc8..af81110 100644
--- a/compiler/utils/Util.lhs
+++ b/compiler/utils/Util.lhs
@@ -32,6 +32,7 @@ module Util (
 
         -- * List operations controlled by another list
         takeList, dropList, splitAtList, split,
+        dropTail,
 
         -- * For loop
         nTimes,
@@ -93,7 +94,7 @@ import Control.Monad    ( unless )
 import System.IO.Error as IO ( catch, isDoesNotExistError )
 import System.Directory ( doesDirectoryExist, createDirectory,
                           getModificationTime )
-import System.FilePath hiding ( searchPathSeparator )
+import System.FilePath
 import Data.Char        ( isUpper, isAlphaNum, isSpace, ord, isDigit )
 import Data.Ratio       ( (%) )
 import System.Time      ( ClockTime )
@@ -107,6 +108,15 @@ infixr 9 `thenCmp`
 %*                                                                      *
 %************************************************************************
 
+These booleans are global constants, set by CPP flags.  They allow us to
+recompile a single module (this one) to change whether or not debug output
+appears. They sometimes let us avoid even running CPP elsewhere.
+
+It's important that the flags are literal constants (True/False). Then,
+with -0, tests of the flags in other modules will simplify to the correct
+branch of the conditional, thereby dropping debug code altogether when
+the flags are off.
+
 \begin{code}
 ghciSupported :: Bool
 #ifdef GHCI
@@ -599,6 +609,10 @@ splitAtList (_:xs) (y:ys) = (y:ys', ys'')
     where
       (ys', ys'') = splitAtList xs ys
 
+-- drop from the end of a list
+dropTail :: Int -> [a] -> [a]
+dropTail n = reverse . drop n . reverse
+
 snocView :: [a] -> Maybe ([a],a)
         -- Split off the last element
 snocView [] = Nothing
@@ -874,17 +888,7 @@ parseSearchPath path = split path
 #endif
             _                                 -> chunk'
 
-        (chunk', rest') = break (==searchPathSeparator) s
-
--- | A platform-specific character used to separate search path strings in
--- environment variables. The separator is a colon (\":\") on Unix and
--- Macintosh, and a semicolon (\";\") on the Windows operating system.
-searchPathSeparator :: Char
-#if mingw32_HOST_OS || mingw32_TARGET_OS
-searchPathSeparator = ';'
-#else
-searchPathSeparator = ':'
-#endif
+        (chunk', rest') = break isSearchPathSeparator s
 
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