[commit: ghc] wip/nfs-locking: Pass --enable-tarballs-autodownload to configure by default on Windows. (1562315)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : wip/nfs-locking
Link       : http://ghc.haskell.org/trac/ghc/changeset/1562315b94894f4e8098da8ac35ce2a007f2dc1f/ghc

>---------------------------------------------------------------

commit 1562315b94894f4e8098da8ac35ce2a007f2dc1f
Author: Andrey Mokhov <andrey.mokhov at gmail.com>
Date:   Fri Feb 5 01:08:31 2016 +0000

    Pass --enable-tarballs-autodownload to configure by default on Windows.
    
    See #204.


>---------------------------------------------------------------

1562315b94894f4e8098da8ac35ce2a007f2dc1f
 src/Rules/Config.hs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Rules/Config.hs b/src/Rules/Config.hs
index 89434cb..1016be9 100644
--- a/src/Rules/Config.hs
+++ b/src/Rules/Config.hs
@@ -1,5 +1,7 @@
 module Rules.Config (configRules) where
 
+import qualified System.Info
+
 import Base
 import CmdLineFlag
 import Rules.Actions
@@ -14,7 +16,11 @@ configRules = do
         case cmdConfigure of
             RunConfigure args -> do
                 need [ settings <.> "in", cfgH <.> "in" ]
-                runConfigure "." [] [args]
+                -- We cannot use windowsHost here due to a cyclic dependency
+                let defaultArgs = if System.Info.os == "mingw32"
+                                  then [ "--enable-tarballs-autodownload" ]
+                                  else []
+                runConfigure "." [] $ defaultArgs ++ [args]
             SkipConfigure     -> unlessM (doesFileExist cfg) $
                 putError $ "Configuration file " ++ cfg ++ " is missing.\n"
                     ++ "Run the configure script either manually or via the "