Implement GHC.Environment.getFullArgs

This returns all the arguments, including those normally eaten by the
RTS (+RTS ... -RTS).
This is mainly for ghc-inplace, where we need to pass /all/ the
arguments on to the real ghc. e.g. ioref001(ghci) was failing because
the +RTS -K32m -RTS wasn't getting passed on.

GHC/Environment.hs

+
+module GHC.Environment (getFullArgs) where
+
+import Prelude
+import Foreign
+import Foreign.C
+import Control.Monad
+
+getFullArgs :: IO [String]
+getFullArgs =
+  alloca $ \ p_argc ->
+  alloca $ \ p_argv -> do
+   getFullProgArgv p_argc p_argv
+   p    <- fromIntegral `liftM` peek p_argc
+   argv <- peek p_argv
+   peekArray (p - 1) (advancePtr argv 1) >>= mapM peekCString
+
+foreign import ccall unsafe "getFullProgArgv"
+    getFullProgArgv :: Ptr CInt -> Ptr (Ptr CString) -> IO ()
+

base.cabal

@@ -106,6 +106,7 @@ exposed-modules:
 	GHC.ConsoleHandler,
 	GHC.Dotnet,
 	GHC.Enum,
+	GHC.Environment,
 	GHC.Err,
 	GHC.Exception,
 	GHC.Exts,