diff --git a/Source/cmGlobalBorlandMakefileGenerator.cxx b/Source/cmGlobalBorlandMakefileGenerator.cxx
index 7d0572677..87665a03b 100644
--- a/Source/cmGlobalBorlandMakefileGenerator.cxx
+++ b/Source/cmGlobalBorlandMakefileGenerator.cxx
@@ -44,10 +44,10 @@ void cmGlobalBorlandMakefileGenerator
 
 ///! Create a local generator appropriate to this Global Generator
 cmLocalGenerator *cmGlobalBorlandMakefileGenerator::CreateLocalGenerator(
-    cmLocalGenerator* parent)
+    cmLocalGenerator* parent, cmState::Snapshot snapshot)
 {
   cmLocalUnixMakefileGenerator3* lg =
-      new cmLocalUnixMakefileGenerator3(this, parent);
+      new cmLocalUnixMakefileGenerator3(this, parent, snapshot);
   lg->SetMakefileVariableSize(32);
   lg->SetMakeCommandEscapeTargetTwice(true);
   lg->SetBorlandMakeCurlyHack(true);
diff --git a/Source/cmGlobalBorlandMakefileGenerator.h b/Source/cmGlobalBorlandMakefileGenerator.h
index eac297e8c..2ec510d5d 100644
--- a/Source/cmGlobalBorlandMakefileGenerator.h
+++ b/Source/cmGlobalBorlandMakefileGenerator.h
@@ -36,7 +36,8 @@ public:
   static void GetDocumentation(cmDocumentationEntry& entry);
 
   ///! Create a local generator appropriate to this Global Generator
-  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent = 0);
+  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent,
+                                                 cmState::Snapshot snapshot);
 
   /**
    * Try to determine system information such as shared library
diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index 7cb572477..cd05c54c6 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -1884,15 +1884,22 @@ void cmGlobalGenerator::EnableInstallTarget()
 }
 
 cmLocalGenerator *
-cmGlobalGenerator::MakeLocalGenerator(cmLocalGenerator *parent)
+cmGlobalGenerator::MakeLocalGenerator(cmState::Snapshot snapshot,
+                                      cmLocalGenerator *parent)
 {
-  return this->CreateLocalGenerator(parent);
+  if (!snapshot.IsValid())
+    {
+    snapshot = this->CMakeInstance->GetCurrentSnapshot();
+    }
+
+  return this->CreateLocalGenerator(parent, snapshot);
 }
 
-cmLocalGenerator *
-cmGlobalGenerator::CreateLocalGenerator(cmLocalGenerator *parent)
+cmLocalGenerator*
+cmGlobalGenerator::CreateLocalGenerator(cmLocalGenerator* parent,
+                                        cmState::Snapshot snapshot)
 {
-  return new cmLocalGenerator(this, parent);
+  return new cmLocalGenerator(this, parent, snapshot);
 }
 
 void cmGlobalGenerator::EnableLanguagesFromGenerator(cmGlobalGenerator *gen,
diff --git a/Source/cmGlobalGenerator.h b/Source/cmGlobalGenerator.h
index 98f87ed95..979e97103 100644
--- a/Source/cmGlobalGenerator.h
+++ b/Source/cmGlobalGenerator.h
@@ -21,6 +21,7 @@
 #include "cmExportSetMap.h" // For cmExportSetMap
 #include "cmGeneratorTarget.h"
 #include "cmGeneratorExpression.h"
+#include "cmState.h"
 
 #if defined(CMAKE_BUILD_WITH_CMAKE)
 # include "cmFileLockPool.h"
@@ -56,7 +57,9 @@ public:
   cmGlobalGenerator(cmake* cm);
   virtual ~cmGlobalGenerator();
 
-  cmLocalGenerator* MakeLocalGenerator(cmLocalGenerator* parent = 0);
+  cmLocalGenerator* MakeLocalGenerator(
+      cmState::Snapshot snapshot = cmState::Snapshot(),
+      cmLocalGenerator* parent = 0);
 
   ///! Get the name for this generator
   virtual std::string GetName() const { return "Generic"; }
@@ -441,7 +444,8 @@ protected:
 
 private:
   ///! Create a local generator appropriate to this Global Generator
-  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent);
+  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent,
+                                                 cmState::Snapshot snapshot);
 
   cmMakefile* TryCompileOuterMakefile;
   float FirstTimeProgress;
diff --git a/Source/cmGlobalGhsMultiGenerator.cxx b/Source/cmGlobalGhsMultiGenerator.cxx
index 2bb06171d..f764418f0 100644
--- a/Source/cmGlobalGhsMultiGenerator.cxx
+++ b/Source/cmGlobalGhsMultiGenerator.cxx
@@ -33,9 +33,10 @@ cmGlobalGhsMultiGenerator::~cmGlobalGhsMultiGenerator()
 }
 
 cmLocalGenerator *
-cmGlobalGhsMultiGenerator::CreateLocalGenerator(cmLocalGenerator* parent)
+cmGlobalGhsMultiGenerator::CreateLocalGenerator(cmLocalGenerator* parent,
+                                                cmState::Snapshot snapshot)
 {
-  return new cmLocalGhsMultiGenerator(this, parent);
+  return new cmLocalGhsMultiGenerator(this, parent, snapshot);
 }
 
 void cmGlobalGhsMultiGenerator::GetDocumentation(cmDocumentationEntry &entry)
diff --git a/Source/cmGlobalGhsMultiGenerator.h b/Source/cmGlobalGhsMultiGenerator.h
index 8b7ecf84b..f1a3ed703 100644
--- a/Source/cmGlobalGhsMultiGenerator.h
+++ b/Source/cmGlobalGhsMultiGenerator.h
@@ -31,7 +31,8 @@ public:
   { return new cmGlobalGeneratorSimpleFactory<cmGlobalGhsMultiGenerator>(); }
 
   ///! create the correct local generator
-  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent = 0);
+  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent,
+                                                 cmState::Snapshot snapshot);
 
   /// @return the name of this generator.
   static std::string GetActualName() { return "Green Hills MULTI"; }
diff --git a/Source/cmGlobalNinjaGenerator.cxx b/Source/cmGlobalNinjaGenerator.cxx
index 2c5896ce3..10828e232 100644
--- a/Source/cmGlobalNinjaGenerator.cxx
+++ b/Source/cmGlobalNinjaGenerator.cxx
@@ -529,9 +529,10 @@ cmGlobalNinjaGenerator::cmGlobalNinjaGenerator(cmake* cm)
 // Virtual public methods.
 
 cmLocalGenerator*
-cmGlobalNinjaGenerator::CreateLocalGenerator(cmLocalGenerator* parent)
+cmGlobalNinjaGenerator::CreateLocalGenerator(cmLocalGenerator* parent,
+                                             cmState::Snapshot snapshot)
 {
-  return new cmLocalNinjaGenerator(this, parent);
+  return new cmLocalNinjaGenerator(this, parent, snapshot);
 }
 
 void cmGlobalNinjaGenerator
diff --git a/Source/cmGlobalNinjaGenerator.h b/Source/cmGlobalNinjaGenerator.h
index 88b7067fb..ffd1cdcb3 100644
--- a/Source/cmGlobalNinjaGenerator.h
+++ b/Source/cmGlobalNinjaGenerator.h
@@ -170,7 +170,8 @@ public:
   virtual ~cmGlobalNinjaGenerator() { }
 
   /// Overloaded methods. @see cmGlobalGenerator::CreateLocalGenerator()
-  virtual cmLocalGenerator* CreateLocalGenerator(cmLocalGenerator* parent = 0);
+  virtual cmLocalGenerator* CreateLocalGenerator(cmLocalGenerator* parent,
+                                                 cmState::Snapshot snapshot);
 
   /// Overloaded methods. @see cmGlobalGenerator::GetName().
   virtual std::string GetName() const {
diff --git a/Source/cmGlobalUnixMakefileGenerator3.cxx b/Source/cmGlobalUnixMakefileGenerator3.cxx
index 372e87a7a..4fe52dde7 100644
--- a/Source/cmGlobalUnixMakefileGenerator3.cxx
+++ b/Source/cmGlobalUnixMakefileGenerator3.cxx
@@ -60,9 +60,10 @@ void cmGlobalUnixMakefileGenerator3
 
 ///! Create a local generator appropriate to this Global Generator
 cmLocalGenerator *
-cmGlobalUnixMakefileGenerator3::CreateLocalGenerator(cmLocalGenerator* parent)
+cmGlobalUnixMakefileGenerator3::CreateLocalGenerator(cmLocalGenerator* parent,
+                                                   cmState::Snapshot snapshot)
 {
-  return new cmLocalUnixMakefileGenerator3(this, parent);
+  return new cmLocalUnixMakefileGenerator3(this, parent, snapshot);
 }
 
 //----------------------------------------------------------------------------
diff --git a/Source/cmGlobalUnixMakefileGenerator3.h b/Source/cmGlobalUnixMakefileGenerator3.h
index 686a4c9d6..a639ff0fd 100644
--- a/Source/cmGlobalUnixMakefileGenerator3.h
+++ b/Source/cmGlobalUnixMakefileGenerator3.h
@@ -68,7 +68,8 @@ public:
   static void GetDocumentation(cmDocumentationEntry& entry);
 
   ///! Create a local generator appropriate to this Global Generator3
-  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent = 0);
+  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent,
+                                                 cmState::Snapshot snapshot);
 
   /**
    * Try to determine system information such as shared library
diff --git a/Source/cmGlobalVisualStudio10Generator.cxx b/Source/cmGlobalVisualStudio10Generator.cxx
index 08357076a..4e8ada476 100644
--- a/Source/cmGlobalVisualStudio10Generator.cxx
+++ b/Source/cmGlobalVisualStudio10Generator.cxx
@@ -307,9 +307,10 @@ void cmGlobalVisualStudio10Generator::WriteSLNHeader(std::ostream& fout)
 
 ///! Create a local generator appropriate to this Global Generator
 cmLocalGenerator *
-cmGlobalVisualStudio10Generator::CreateLocalGenerator(cmLocalGenerator* parent)
+cmGlobalVisualStudio10Generator::CreateLocalGenerator(cmLocalGenerator* parent,
+                                                    cmState::Snapshot snapshot)
 {
-  return new cmLocalVisualStudio10Generator(this, parent);
+  return new cmLocalVisualStudio10Generator(this, parent, snapshot);
 }
 
 //----------------------------------------------------------------------------
diff --git a/Source/cmGlobalVisualStudio10Generator.h b/Source/cmGlobalVisualStudio10Generator.h
index 9faa60383..74d5022b3 100644
--- a/Source/cmGlobalVisualStudio10Generator.h
+++ b/Source/cmGlobalVisualStudio10Generator.h
@@ -46,7 +46,8 @@ public:
     );
 
   ///! create the correct local generator
-  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent = 0);
+  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent,
+                                                 cmState::Snapshot snapshot);
 
   /**
    * Try to determine system information such as shared library
diff --git a/Source/cmGlobalVisualStudio6Generator.cxx b/Source/cmGlobalVisualStudio6Generator.cxx
index f420e4a68..632141af9 100644
--- a/Source/cmGlobalVisualStudio6Generator.cxx
+++ b/Source/cmGlobalVisualStudio6Generator.cxx
@@ -173,9 +173,10 @@ cmGlobalVisualStudio6Generator::GenerateBuildCommand(
 
 ///! Create a local generator appropriate to this Global Generator
 cmLocalGenerator *
-cmGlobalVisualStudio6Generator::CreateLocalGenerator(cmLocalGenerator* parent)
+cmGlobalVisualStudio6Generator::CreateLocalGenerator(cmLocalGenerator* parent,
+                                                   cmState::Snapshot snapshot)
 {
-  return new cmLocalVisualStudio6Generator(this, parent);
+  return new cmLocalVisualStudio6Generator(this, parent, snapshot);
 }
 
 
diff --git a/Source/cmGlobalVisualStudio6Generator.h b/Source/cmGlobalVisualStudio6Generator.h
index 2e61501e1..246015845 100644
--- a/Source/cmGlobalVisualStudio6Generator.h
+++ b/Source/cmGlobalVisualStudio6Generator.h
@@ -39,7 +39,8 @@ public:
   static void GetDocumentation(cmDocumentationEntry& entry);
 
   ///! Create a local generator appropriate to this Global Generator
-  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent = 0);
+  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent,
+                                                 cmState::Snapshot snapshot);
 
   /**
    * Try to determine system information such as shared library
diff --git a/Source/cmGlobalVisualStudio7Generator.cxx b/Source/cmGlobalVisualStudio7Generator.cxx
index 336328ccb..4dd54d021 100644
--- a/Source/cmGlobalVisualStudio7Generator.cxx
+++ b/Source/cmGlobalVisualStudio7Generator.cxx
@@ -279,10 +279,11 @@ void cmGlobalVisualStudio7Generator::GenerateBuildCommand(
 
 ///! Create a local generator appropriate to this Global Generator
 cmLocalGenerator *
-cmGlobalVisualStudio7Generator::CreateLocalGenerator(cmLocalGenerator* parent)
+cmGlobalVisualStudio7Generator::CreateLocalGenerator(cmLocalGenerator* parent,
+                                                   cmState::Snapshot snapshot)
 {
   cmLocalVisualStudio7Generator *lg =
-    new cmLocalVisualStudio7Generator(this, parent);
+    new cmLocalVisualStudio7Generator(this, parent, snapshot);
   return lg;
 }
 
diff --git a/Source/cmGlobalVisualStudio7Generator.h b/Source/cmGlobalVisualStudio7Generator.h
index cbd753bf3..c98d2697e 100644
--- a/Source/cmGlobalVisualStudio7Generator.h
+++ b/Source/cmGlobalVisualStudio7Generator.h
@@ -43,7 +43,8 @@ public:
   std::string const& GetPlatformName() const;
 
   ///! Create a local generator appropriate to this Global Generator
-  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent = 0);
+  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent,
+                                                 cmState::Snapshot snapshot);
 
   virtual bool SetSystemName(std::string const& s, cmMakefile* mf);
 
diff --git a/Source/cmGlobalXCodeGenerator.cxx b/Source/cmGlobalXCodeGenerator.cxx
index 302784dcd..7464e90ee 100644
--- a/Source/cmGlobalXCodeGenerator.cxx
+++ b/Source/cmGlobalXCodeGenerator.cxx
@@ -371,9 +371,10 @@ cmGlobalXCodeGenerator::GenerateBuildCommand(
 //----------------------------------------------------------------------------
 ///! Create a local generator appropriate to this Global Generator
 cmLocalGenerator *
-cmGlobalXCodeGenerator::CreateLocalGenerator(cmLocalGenerator* parent)
+cmGlobalXCodeGenerator::CreateLocalGenerator(cmLocalGenerator* parent,
+                                             cmState::Snapshot snapshot)
 {
-  return new cmLocalXCodeGenerator(this, parent);
+  return new cmLocalXCodeGenerator(this, parent, snapshot);
 }
 
 //----------------------------------------------------------------------------
diff --git a/Source/cmGlobalXCodeGenerator.h b/Source/cmGlobalXCodeGenerator.h
index 42b66970d..c36e4af92 100644
--- a/Source/cmGlobalXCodeGenerator.h
+++ b/Source/cmGlobalXCodeGenerator.h
@@ -41,7 +41,8 @@ public:
   static void GetDocumentation(cmDocumentationEntry& entry);
 
   ///! Create a local generator appropriate to this Global Generator
-  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent = 0);
+  virtual cmLocalGenerator *CreateLocalGenerator(cmLocalGenerator* parent,
+                                                 cmState::Snapshot snapshot);
 
   /**
    * Try to determine system information such as shared library
diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx
index d00b677da..7d8596ea1 100644
--- a/Source/cmLocalGenerator.cxx
+++ b/Source/cmLocalGenerator.cxx
@@ -44,19 +44,16 @@
 #endif
 
 cmLocalGenerator::cmLocalGenerator(cmGlobalGenerator* gg,
-                                   cmLocalGenerator* parent)
+                                   cmLocalGenerator* parent,
+                                   cmState::Snapshot snapshot)
+  : StateSnapshot(snapshot)
 {
+  assert(snapshot.IsValid());
   this->GlobalGenerator = gg;
   this->Parent = parent;
   if (parent)
     {
     parent->AddChild(this);
-    this->StateSnapshot =
-        this->GetState()->CreateSnapshot(parent->StateSnapshot);
-    }
-  else
-    {
-    this->StateSnapshot = gg->GetCMakeInstance()->GetCurrentSnapshot();
     }
 
   this->Makefile = new cmMakefile(this);
diff --git a/Source/cmLocalGenerator.h b/Source/cmLocalGenerator.h
index 3fca22575..44c95860f 100644
--- a/Source/cmLocalGenerator.h
+++ b/Source/cmLocalGenerator.h
@@ -34,7 +34,8 @@ class cmCustomCommandGenerator;
 class cmLocalGenerator
 {
 public:
-  cmLocalGenerator(cmGlobalGenerator* gg, cmLocalGenerator* parent);
+  cmLocalGenerator(cmGlobalGenerator* gg, cmLocalGenerator* parent,
+                   cmState::Snapshot snapshot);
   virtual ~cmLocalGenerator();
 
   /// @return whether we are processing the top CMakeLists.txt file.
diff --git a/Source/cmLocalGhsMultiGenerator.cxx b/Source/cmLocalGhsMultiGenerator.cxx
index 025b464de..870b9b98d 100644
--- a/Source/cmLocalGhsMultiGenerator.cxx
+++ b/Source/cmLocalGhsMultiGenerator.cxx
@@ -17,8 +17,9 @@
 #include "cmGeneratedFileStream.h"
 
 cmLocalGhsMultiGenerator::cmLocalGhsMultiGenerator(cmGlobalGenerator* gg,
-                                                   cmLocalGenerator* parent)
-  : cmLocalGenerator(gg, parent)
+                                                   cmLocalGenerator* parent,
+                                                   cmState::Snapshot snapshot)
+  : cmLocalGenerator(gg, parent, snapshot)
 {
 }
 
diff --git a/Source/cmLocalGhsMultiGenerator.h b/Source/cmLocalGhsMultiGenerator.h
index 3157f11fd..f52ef3999 100644
--- a/Source/cmLocalGhsMultiGenerator.h
+++ b/Source/cmLocalGhsMultiGenerator.h
@@ -25,7 +25,8 @@ class cmGeneratedFileStream;
 class cmLocalGhsMultiGenerator : public cmLocalGenerator
 {
 public:
-  cmLocalGhsMultiGenerator(cmGlobalGenerator* gg, cmLocalGenerator* parent);
+  cmLocalGhsMultiGenerator(cmGlobalGenerator* gg, cmLocalGenerator* parent,
+                           cmState::Snapshot snapshot);
 
   virtual ~cmLocalGhsMultiGenerator();
 
diff --git a/Source/cmLocalNinjaGenerator.cxx b/Source/cmLocalNinjaGenerator.cxx
index bcae486dd..c08c91f12 100644
--- a/Source/cmLocalNinjaGenerator.cxx
+++ b/Source/cmLocalNinjaGenerator.cxx
@@ -23,8 +23,9 @@
 #include <assert.h>
 
 cmLocalNinjaGenerator::cmLocalNinjaGenerator(cmGlobalGenerator* gg,
-                                             cmLocalGenerator* parent)
-  : cmLocalGenerator(gg, parent)
+                                             cmLocalGenerator* parent,
+                                             cmState::Snapshot snapshot)
+  : cmLocalGenerator(gg, parent, snapshot)
   , ConfigName("")
   , HomeRelativeOutputPath("")
 {
diff --git a/Source/cmLocalNinjaGenerator.h b/Source/cmLocalNinjaGenerator.h
index 08b10e63d..7ae97de35 100644
--- a/Source/cmLocalNinjaGenerator.h
+++ b/Source/cmLocalNinjaGenerator.h
@@ -31,7 +31,8 @@ class cmake;
 class cmLocalNinjaGenerator : public cmLocalGenerator
 {
 public:
-  cmLocalNinjaGenerator(cmGlobalGenerator* gg, cmLocalGenerator* parent);
+  cmLocalNinjaGenerator(cmGlobalGenerator* gg, cmLocalGenerator* parent,
+                        cmState::Snapshot snapshot);
 
   virtual ~cmLocalNinjaGenerator();
 
diff --git a/Source/cmLocalUnixMakefileGenerator3.cxx b/Source/cmLocalUnixMakefileGenerator3.cxx
index b68dc5121..3eea59b29 100644
--- a/Source/cmLocalUnixMakefileGenerator3.cxx
+++ b/Source/cmLocalUnixMakefileGenerator3.cxx
@@ -80,8 +80,9 @@ static std::string cmSplitExtension(std::string const& in, std::string& base)
 
 //----------------------------------------------------------------------------
 cmLocalUnixMakefileGenerator3::
-cmLocalUnixMakefileGenerator3(cmGlobalGenerator* gg, cmLocalGenerator* parent)
-  : cmLocalGenerator(gg, parent)
+cmLocalUnixMakefileGenerator3(cmGlobalGenerator* gg, cmLocalGenerator* parent,
+                              cmState::Snapshot snapshot)
+  : cmLocalGenerator(gg, parent, snapshot)
 {
   this->MakefileVariableSize = 0;
   this->ColorMakefile = false;
diff --git a/Source/cmLocalUnixMakefileGenerator3.h b/Source/cmLocalUnixMakefileGenerator3.h
index 0b056fff3..988d66046 100644
--- a/Source/cmLocalUnixMakefileGenerator3.h
+++ b/Source/cmLocalUnixMakefileGenerator3.h
@@ -35,7 +35,8 @@ class cmLocalUnixMakefileGenerator3 : public cmLocalGenerator
 {
 public:
   cmLocalUnixMakefileGenerator3(cmGlobalGenerator* gg,
-                                cmLocalGenerator* parent);
+                                cmLocalGenerator* parent,
+                                cmState::Snapshot snapshot);
   virtual ~cmLocalUnixMakefileGenerator3();
 
   /**
diff --git a/Source/cmLocalVisualStudio10Generator.cxx b/Source/cmLocalVisualStudio10Generator.cxx
index 37b722a8c..ad6a020f7 100644
--- a/Source/cmLocalVisualStudio10Generator.cxx
+++ b/Source/cmLocalVisualStudio10Generator.cxx
@@ -63,8 +63,9 @@ class cmVS10XMLParser : public cmXMLParser
 //----------------------------------------------------------------------------
 cmLocalVisualStudio10Generator
 ::cmLocalVisualStudio10Generator(cmGlobalGenerator* gg,
-                                 cmLocalGenerator* parent):
-  cmLocalVisualStudio7Generator(gg, parent)
+                                 cmLocalGenerator* parent,
+                                 cmState::Snapshot snapshot):
+  cmLocalVisualStudio7Generator(gg, parent, snapshot)
 {
 }
 
diff --git a/Source/cmLocalVisualStudio10Generator.h b/Source/cmLocalVisualStudio10Generator.h
index afd52b946..c588aaf93 100644
--- a/Source/cmLocalVisualStudio10Generator.h
+++ b/Source/cmLocalVisualStudio10Generator.h
@@ -26,7 +26,8 @@ class cmLocalVisualStudio10Generator : public cmLocalVisualStudio7Generator
 public:
   ///! Set cache only and recurse to false by default.
   cmLocalVisualStudio10Generator(cmGlobalGenerator* gg,
-                                 cmLocalGenerator* parent);
+                                 cmLocalGenerator* parent,
+                                 cmState::Snapshot snapshot);
 
   virtual ~cmLocalVisualStudio10Generator();
 
diff --git a/Source/cmLocalVisualStudio6Generator.cxx b/Source/cmLocalVisualStudio6Generator.cxx
index 7afb53a1f..ad3485701 100644
--- a/Source/cmLocalVisualStudio6Generator.cxx
+++ b/Source/cmLocalVisualStudio6Generator.cxx
@@ -25,8 +25,9 @@
 
 cmLocalVisualStudio6Generator
 ::cmLocalVisualStudio6Generator(cmGlobalGenerator* gg,
-                                cmLocalGenerator* parent):
-  cmLocalVisualStudioGenerator(gg, parent)
+                                cmLocalGenerator* parent,
+                                cmState::Snapshot snapshot):
+  cmLocalVisualStudioGenerator(gg, parent, snapshot)
 {
 }
 
diff --git a/Source/cmLocalVisualStudio6Generator.h b/Source/cmLocalVisualStudio6Generator.h
index a6e0b3d35..8f4d521eb 100644
--- a/Source/cmLocalVisualStudio6Generator.h
+++ b/Source/cmLocalVisualStudio6Generator.h
@@ -30,7 +30,8 @@ class cmLocalVisualStudio6Generator : public cmLocalVisualStudioGenerator
 public:
   ///! Set cache only and recurse to false by default.
   cmLocalVisualStudio6Generator(cmGlobalGenerator* gg,
-                                cmLocalGenerator* parent);
+                                cmLocalGenerator* parent,
+                                cmState::Snapshot snapshot);
 
   virtual ~cmLocalVisualStudio6Generator();
 
diff --git a/Source/cmLocalVisualStudio7Generator.cxx b/Source/cmLocalVisualStudio7Generator.cxx
index d2fb9700b..9c031cff6 100644
--- a/Source/cmLocalVisualStudio7Generator.cxx
+++ b/Source/cmLocalVisualStudio7Generator.cxx
@@ -56,8 +56,9 @@ static void cmConvertToWindowsSlash(std::string& s)
 //----------------------------------------------------------------------------
 cmLocalVisualStudio7Generator
 ::cmLocalVisualStudio7Generator(cmGlobalGenerator* gg,
-                                cmLocalGenerator* parent):
-  cmLocalVisualStudioGenerator(gg, parent)
+                                cmLocalGenerator* parent,
+                                cmState::Snapshot snapshot):
+  cmLocalVisualStudioGenerator(gg, parent, snapshot)
 {
   this->Internal = new cmLocalVisualStudio7GeneratorInternals(this);
 }
diff --git a/Source/cmLocalVisualStudio7Generator.h b/Source/cmLocalVisualStudio7Generator.h
index 59c214410..43f3af9c6 100644
--- a/Source/cmLocalVisualStudio7Generator.h
+++ b/Source/cmLocalVisualStudio7Generator.h
@@ -36,7 +36,8 @@ class cmLocalVisualStudio7Generator : public cmLocalVisualStudioGenerator
 public:
   ///! Set cache only and recurse to false by default.
   cmLocalVisualStudio7Generator(cmGlobalGenerator* gg,
-                                cmLocalGenerator* parent);
+                                cmLocalGenerator* parent,
+                                cmState::Snapshot snapshot);
 
   virtual ~cmLocalVisualStudio7Generator();
 
diff --git a/Source/cmLocalVisualStudioGenerator.cxx b/Source/cmLocalVisualStudioGenerator.cxx
index f472bbac4..ca7293993 100644
--- a/Source/cmLocalVisualStudioGenerator.cxx
+++ b/Source/cmLocalVisualStudioGenerator.cxx
@@ -20,8 +20,9 @@
 //----------------------------------------------------------------------------
 cmLocalVisualStudioGenerator
 ::cmLocalVisualStudioGenerator(cmGlobalGenerator* gg,
-                               cmLocalGenerator* parent)
-  : cmLocalGenerator(gg, parent)
+                               cmLocalGenerator* parent,
+                               cmState::Snapshot snapshot)
+  : cmLocalGenerator(gg, parent, snapshot)
 {
 }
 
diff --git a/Source/cmLocalVisualStudioGenerator.h b/Source/cmLocalVisualStudioGenerator.h
index df7d20c3c..d414651b8 100644
--- a/Source/cmLocalVisualStudioGenerator.h
+++ b/Source/cmLocalVisualStudioGenerator.h
@@ -32,7 +32,8 @@ class cmLocalVisualStudioGenerator : public cmLocalGenerator
 {
 public:
   cmLocalVisualStudioGenerator(cmGlobalGenerator* gg,
-                               cmLocalGenerator* parent);
+                               cmLocalGenerator* parent,
+                               cmState::Snapshot snapshot);
   virtual ~cmLocalVisualStudioGenerator();
 
   /** Construct a script from the given list of command lines.  */
diff --git a/Source/cmLocalXCodeGenerator.cxx b/Source/cmLocalXCodeGenerator.cxx
index a957c2733..804dd7d73 100644
--- a/Source/cmLocalXCodeGenerator.cxx
+++ b/Source/cmLocalXCodeGenerator.cxx
@@ -16,8 +16,9 @@
 
 //----------------------------------------------------------------------------
 cmLocalXCodeGenerator::cmLocalXCodeGenerator(cmGlobalGenerator* gg,
-                                             cmLocalGenerator* parent)
-  : cmLocalGenerator(gg, parent)
+                                             cmLocalGenerator* parent,
+                                             cmState::Snapshot snapshot)
+  : cmLocalGenerator(gg, parent, snapshot)
 {
   // the global generator does this, so do not
   // put these flags into the language flags
diff --git a/Source/cmLocalXCodeGenerator.h b/Source/cmLocalXCodeGenerator.h
index 54bc6dfbf..26fff9cb1 100644
--- a/Source/cmLocalXCodeGenerator.h
+++ b/Source/cmLocalXCodeGenerator.h
@@ -24,7 +24,8 @@ class cmLocalXCodeGenerator : public cmLocalGenerator
 {
 public:
   ///! Set cache only and recurse to false by default.
-  cmLocalXCodeGenerator(cmGlobalGenerator* gg, cmLocalGenerator* parent);
+  cmLocalXCodeGenerator(cmGlobalGenerator* gg, cmLocalGenerator* parent,
+                        cmState::Snapshot snapshot);
 
   virtual ~cmLocalXCodeGenerator();
   virtual std::string GetTargetDirectory(cmTarget const& target) const;
diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index 3e8ae857a..1d0587355 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -1625,9 +1625,12 @@ void cmMakefile::AddSubDirectory(const std::string& srcPath,
     return;
     }
 
+  cmState::Snapshot newSnapshot = this->GetState()
+      ->CreateSnapshot(this->StateSnapshot);
+
   // create a new local generator and set its parent
   cmLocalGenerator *lg2 = this->GetGlobalGenerator()
-        ->MakeLocalGenerator(this->LocalGenerator);
+        ->MakeLocalGenerator(newSnapshot, this->LocalGenerator);
   this->GetGlobalGenerator()->AddLocalGenerator(lg2);
 
   // set the subdirs start dirs
diff --git a/Source/cmState.cxx b/Source/cmState.cxx
index 9ecd061ed..58885d3b9 100644
--- a/Source/cmState.cxx
+++ b/Source/cmState.cxx
@@ -661,6 +661,10 @@ void cmState::Snapshot::ComputeRelativePathTopBinary()
 
 cmState::Snapshot cmState::CreateSnapshot(Snapshot originSnapshot)
 {
+  if (!originSnapshot.IsValid())
+    {
+    originSnapshot.State = this;
+    }
   PositionType pos = this->ParentPositions.size();
   this->ParentPositions.push_back(originSnapshot.Position);
   this->Locations.resize(this->Locations.size() + 1);