Fixed #ifdef generation magic.

Author: svenpanne

CHANGELOG.md

@@ -1,5 +1,6 @@
 3.1.0.1
 -------
+* Updated warning flag magic for GHC 8.0.
 * Updated OpenGL registry to r32363.
 
 3.1.0.0

RegistryProcessor/src/Main.hs

@@ -77,7 +77,7 @@ printTokens api registry = do
   let comment =
         ["All enumeration tokens from the",
          "<http://www.opengl.org/registry/ OpenGL registry>."]
-  startModule ["Tokens"] (Just "{-# LANGUAGE PatternSynonyms, ScopedTypeVariables #-}\n{-# OPTIONS_GHC -Wno-missing-pattern-synonym-signatures #-}") comment $ \moduleName h -> do
+  startModule ["Tokens"] (Just "{-# LANGUAGE CPP, PatternSynonyms, ScopedTypeVariables #-}\n#if __GLASGOW_HASKELL__ >= 800\n{-# OPTIONS_GHC -Wno-missing-pattern-synonym-signatures #-}\n#endif") comment $ \moduleName h -> do
     SI.hPutStrLn h $ "module " ++ moduleName ++ " where"
     SI.hPutStrLn h ""
     SI.hPutStrLn h $ "import " ++ moduleNameFor ["Types"]