From e7c58f6c35d110a43c483a796fef644c6e22ce89 Mon Sep 17 00:00:00 2001
From: Ian Monroe <ian@hipchat.com>
Date: Thu, 18 Apr 2013 10:57:39 -0700
Subject: [PATCH] Ninja: use cd /D to set directory on Windows

Add_custom_command was unable to handle build and source directories
existing on different drives.
---
 Source/cmLocalNinjaGenerator.cxx | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Source/cmLocalNinjaGenerator.cxx b/Source/cmLocalNinjaGenerator.cxx
index d902f4ef7..294a53920 100644
--- a/Source/cmLocalNinjaGenerator.cxx
+++ b/Source/cmLocalNinjaGenerator.cxx
@@ -302,7 +302,12 @@ void cmLocalNinjaGenerator::AppendCustomCommandLines(const cmCustomCommand *cc,
       wd = this->GetMakefile()->GetStartOutputDirectory();
 
     cmOStringStream cdCmd;
-    cdCmd << "cd " << this->ConvertToOutputFormat(wd, SHELL);
+#ifdef _WIN32
+        std::string cdStr = "cd /D ";
+#else
+        std::string cdStr = "cd ";
+#endif
+    cdCmd << cdStr << this->ConvertToOutputFormat(wd, SHELL);
     cmdLines.push_back(cdCmd.str());
   }
   for (unsigned i = 0; i != ccg.GetNumberOfCommands(); ++i) {