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diff --git a/Source/cmSourceFileLocation.h b/Source/cmSourceFileLocation.h
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+++ b/Source/cmSourceFileLocation.h
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+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef cmSourceFileLocation_h
+#define cmSourceFileLocation_h
+
+#include "cmStandardIncludes.h"
+
+class cmMakefile;
+
+/** \class cmSourceFileLocation
+ * \brief cmSourceFileLocation tracks knowledge about a source file location
+ *
+ * Source files can be referenced by a variety of names.  The
+ * directory and/or extension may be omitted leading to a certain
+ * level of ambiguity about the source file location.  This class is
+ * used by cmSourceFile to keep track of what is known about the
+ * source file location.  Each reference may add some information
+ * about the directory or extension of the file.
+ */
+class cmSourceFileLocation
+{
+public:
+  /**
+   * Construct for a source file created in a given cmMakefile
+   * instance with an initial name.
+   */
+  cmSourceFileLocation(cmMakefile* mf, const char* name);
+
+  /**
+   * Return whether the givne source file location could refers to the
+   * same source file as this location given the level of ambiguity in
+   * each location.
+   */
+  bool Matches(cmSourceFileLocation const& loc);
+
+  /**
+   * Explicity state that the source file is located in the source tree.
+   */
+  void DirectoryUseSource();
+
+  /**
+   * Explicity state that the source file is located in the build tree.
+   */
+  void DirectoryUseBinary();
+
+  /**
+   * Return whether the directory containing the source is ambiguous.
+   */
+  bool DirectoryIsAmbiguous() const { return this->AmbiguousDirectory; }
+
+  /**
+   * Return whether the extension of the source name is ambiguous.
+   */
+  bool ExtensionIsAmbiguous() const { return this->AmbiguousExtension; }
+
+  /**
+   * Get the directory containing the file as best is currently known.
+   * If DirectoryIsAmbiguous() returns false this will be a full path.
+   * Otherwise it will be a relative path (possibly empty) that is
+   * either with respect to the source or build tree.
+   */
+  const char* GetDirectory() const { return this->Directory.c_str(); }
+
+  /**
+   * Get the file name as best is currently known.  If
+   * ExtensionIsAmbiguous() returns true this name may not be the
+   * final name (but could be).  Otherwise the returned name is the
+   * final name.
+   */
+  const char* GetName() const { return this->Name.c_str(); }
+
+  /**
+   * Get the cmMakefile instance for which the source file was created.
+   */
+  cmMakefile* GetMakefile() const { return this->Makefile; }
+private:
+  cmMakefile* Makefile;
+  bool AmbiguousDirectory;
+  bool AmbiguousExtension;
+  std::string Directory;
+  std::string Name;
+
+  bool MatchesAmbiguousExtension(cmSourceFileLocation const& loc) const;
+
+  // Update the location with additional knowledge.
+  void Update(cmSourceFileLocation const& loc);
+  void Update(const char* name);
+  void UpdateExtension(const char* name);
+  void UpdateDirectory(const char* name);
+};
+
+#endif