Small rearrangements

[ghc-hetmet.git] / compiler / main / HeaderInfo.hs

diff --git a/compiler/main/HeaderInfo.hs b/compiler/main/HeaderInfo.hs
index 717a847..51e491e 100644 (file)
--- a/compiler/main/HeaderInfo.hs
+++ b/compiler/main/HeaderInfo.hs
@@ -33,9 +33,6 @@ import Panic
 import Maybes
 import Bag             ( emptyBag, listToBag )
 
-import Distribution.Compiler
-import Distribution.Version
-
 import Control.Exception
 import Control.Monad
 import System.Exit
@@ -178,16 +175,13 @@ getOptions' buf filename
 
 checkExtension :: Located FastString -> Located String
 checkExtension (L l ext)
- = case reads (unpackFS ext) of
-       [] -> languagePragParseError l
-       (okExt,""):_ ->
-           case readVersion cProjectVersion of
-               Just version ->
-                   case extensionsToGHCFlag version [okExt] of
-                       ([],[opt]) -> L l opt
-                       _ -> unsupportedExtnError l okExt
-               Nothing ->
-                   panic ("Can't parse version: " ++ show cProjectVersion)
+-- Checks if a given extension is valid, and if so returns
+-- its corresponding flag. Otherwise it throws an exception.
+ =  let ext' = unpackFS ext in
+    if ext' `elem` supportedLanguages
+       || ext' `elem` (map ("No"++) supportedLanguages)
+    then L l ("-X"++ext')
+    else unsupportedExtnError l ext'
 
 languagePragParseError loc =
   pgmError (showSDoc (mkLocMessage loc (
@@ -196,7 +190,7 @@ languagePragParseError loc =
 unsupportedExtnError loc unsup =
   pgmError (showSDoc (mkLocMessage loc (
                 text "unsupported extension: " <>
-                (text.show) unsup)))
+                text unsup)))
 
 
 optionsErrorMsgs :: [String] -> [Located String] -> FilePath -> Messages