ENH: Add an invocation that maintains symbolic paths to the source and binary trees, mainly for systems with automounted network drives.

ENH: CollapseFullPath() no longer adds a trailing "/" to directory paths.

Source/cmSystemTools.h

@@ -254,6 +254,16 @@ public:
                                std::string& file);
   static std::string CollapseFullPath(const char*);
 
+  /**
+   * all file path prefixes matching \arg from will be replaced by
+   * \arg to.  Affects the return value of CollapseFullPath and
+   * GetCurrentWorkingDirectory.
+   */
+  static void AddPathTranslation( const std::string& from, const std::string& to );
+
+  ///! Apply the current path translations to \arg path.
+  static void ApplyPathTranslation( std::string& path );
+
   ///! return path of a full filename (no trailing slashes).
   static std::string GetFilenamePath(const std::string&);
   
@@ -295,6 +305,9 @@ private:
   static bool s_DisableMessages;
   static bool s_DisableRunCommandOutput;
   static ErrorCallback s_ErrorCallback;
+
+  typedef std::map<cmStdString, cmStdString> PathMap;
+  static PathMap s_PathMap;
 };