From c60557e973643c5d60da17911d096f7ac88996c2 Mon Sep 17 00:00:00 2001
From: Peter Kuemmel <syntheticpp@gmx.net>
Date: Wed, 6 Jun 2012 01:36:34 +0200
Subject: Ninja: don't break because of empty commands

---
 Source/cmGlobalNinjaGenerator.cxx | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Source/cmGlobalNinjaGenerator.cxx b/Source/cmGlobalNinjaGenerator.cxx
index a91aa15..5477adf 100644
--- a/Source/cmGlobalNinjaGenerator.cxx
+++ b/Source/cmGlobalNinjaGenerator.cxx
@@ -225,10 +225,17 @@ cmGlobalNinjaGenerator::WriteCustomCommandBuild(const std::string& command,
                                                 const cmNinjaDeps& deps,
                                               const cmNinjaDeps& orderOnlyDeps)
 {
+  std::string cmd = command;
+#ifdef _WIN32
+   if (cmd.empty())
+      // TODO Shouldn't an empty command be handled by ninja?
+      cmd = "cmd.exe /c";
+#endif
+
   this->AddCustomCommandRule();
 
   cmNinjaVars vars;
-  vars["COMMAND"] = command;
+  vars["COMMAND"] = cmd;
   vars["DESC"] = EncodeLiteral(description);
 
   cmGlobalNinjaGenerator::WriteBuild(*this->BuildFileStream,
-- 
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