From 995cfb0e2a4d2787371f87568bc943e6ad34d55c Mon Sep 17 00:00:00 2001
From: Ben Boeckel <ben.boeckel@kitware.com>
Date: Thu, 16 Sep 2010 13:52:17 -0400
Subject: Don't warn if the variable wasn't defined

---
 Source/cmMakefile.cxx | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index a7f86ae..1e12658 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -1783,8 +1783,13 @@ void cmMakefile::CheckForUnused(const char* reason, const char* name) const
 void cmMakefile::RemoveDefinition(const char* name)
 {
   this->Internal->VarStack.top().Set(name, 0);
+  if (this->Internal->VarUsageStack.size() &&
+      this->VariableInitialized(name))
+    {
+    this->CheckForUnused("unsetting", name);
+    this->Internal->VarUsageStack.top().erase(name);
+    }
   this->Internal->VarInitStack.top().insert(name);
-  this->CheckForUnused("unsetting", name);
 #ifdef CMAKE_BUILD_WITH_CMAKE
   cmVariableWatch* vv = this->GetVariableWatch();
   if ( vv )
-- 
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