GHC version check.

Check.hs

@@ -1,3 +1,5 @@
+{-# LANGUAGE CPP #-}
+
 module Check (checkSyntax) where
 
 import Control.Applicative
@@ -15,7 +17,11 @@ import System.Process
 checkSyntax :: Options -> String -> IO String
 checkSyntax opt file = do
     makeDirectory (outDir opt)
+#if __GLASGOW_HASKELL__ == 612
     (_,_,herr,_) <- runInteractiveProcess (ghc opt) ["--make","-Wall","-fno-warn-unused-do-bind",file,"-outputdir","dist/flymake","-o","dist/flymake/a.out","-i..","-i../..","-i../../..","-i../../../..","-i../../../../.."] Nothing Nothing
+#else
+    (_,_,herr,_) <- runInteractiveProcess (ghc opt) ["--make","-Wall",file,"-outputdir","dist/flymake","-o","dist/flymake/a.out","-i..","-i../..","-i../../..","-i../../../..","-i../../../../.."] Nothing Nothing
+#endif
     hSetBinaryMode herr False
     refine <$> hGetContents herr
   where

ghc-mod.cabal

@@ -24,8 +24,11 @@ Data-Files:             Makefile ghc.el ghc-func.el ghc-doc.el ghc-comp.el
 Executable ghc-mod
   Main-Is:              GHCMod.hs
   Other-Modules:        List Browse Check Param Lang
-  GHC-Options:          -Wall -fno-warn-unused-do-bind
-  Build-Depends:        base >= 4.0 && < 10,
+  if impl(ghc >= 6.12)
+    GHC-Options:        -Wall -O2 -fno-warn-unused-do-bind
+  else
+    GHC-Options:        -Wall -O2
+  Build-Depends:        base >= 4.0 && < 5,
                         parsec >= 3, process, haskell-src-exts,
                         directory, filepath
 Source-Repository head