[commit: process] master: Fix the build on Windows (1f4e1b0)

[Ian Lynagh]

Repository : ssh://darcs.haskell.org//srv/darcs/packages/process

On branch  : master

http://hackage.haskell.org/trac/ghc/changeset/1f4e1b0a5ba7f14458c6e35dfd8e9f7fec7ee256

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

commit 1f4e1b0a5ba7f14458c6e35dfd8e9f7fec7ee256
Author: Ian Lynagh <ian at well-typed.com>
Date:   Sat Apr 27 22:00:10 2013 +0100

    Fix the build on Windows

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

 System/Process.hs |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/System/Process.hs b/System/Process.hs
index e3aa98d..42d2fac 100644
--- a/System/Process.hs
+++ b/System/Process.hs
@@ -636,13 +636,18 @@ interruptProcessGroupOf ph = do
 #if mingw32_HOST_OS
                 pid <- getProcessId h
                 generateConsoleCtrlEvent cTRL_BREAK_EVENT pid
-#elif MIN_VERSION_unix(2,5,0)
+-- We can't use an #elif here, because MIN_VERSION_unix isn't defined
+-- on Windows, so on Windows cpp fails:
+-- error: missing binary operator before token "("
+#else
+#if MIN_VERSION_unix(2,5,0)
                 -- getProcessGroupIDOf was added in unix-2.5.0.0
                 pgid <- getProcessGroupIDOf h
                 signalProcessGroup sigINT pgid
 #else
                 signalProcessGroup sigINT h
 #endif
+#endif
                 return ()
 
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