MAkefile now strips duplicate directores from the libraries and include paths

Source/cmMakefile.cxx

@@ -408,6 +408,9 @@ void cmMakefile::FinalPass()
 {
   // do all the variable expansions here
   this->ExpandVariables();
+
+  this->StripDuplicateDirectories();
+
   // give all the commands a chance to do something
   // after the file has been parsed before generation
   for(std::vector<cmCommand*>::iterator i = m_UsedCommands.begin();
@@ -790,6 +793,29 @@ int cmMakefile::DumpDocumentationToFile(const char *fileName)
 }
 
 
+  // Remove duplicate directories from the library and include paths.
+void cmMakefile::StripDuplicateDirectories()
+{
+  std::vector<std::string>::iterator begin, end;
+  // remove duplicates from m_IncludeDirectories
+  begin = m_IncludeDirectories.begin();
+  end = m_IncludeDirectories.end();
+  std::list<std::string> tmp1(begin, end);
+  tmp1.sort();
+  m_IncludeDirectories.clear();
+  std::unique_copy(tmp1.begin(), tmp1.end(), std::back_inserter(m_IncludeDirectories));
+
+  // remove duplicates from m_LinkDirectories
+  begin = m_LinkDirectories.begin();
+  end = m_LinkDirectories.end();
+  std::list<std::string> tmp2(begin, end);
+  tmp2.sort();
+  m_LinkDirectories.clear();
+  std::unique_copy(tmp2.begin(), tmp2.end(), std::back_inserter(m_LinkDirectories));
+}
+
+
+
 void cmMakefile::ExpandVariablesInString(std::string& source) const
 {
   this->ExpandVariablesInString(source, false);

Source/cmMakefile.h

@@ -481,6 +481,11 @@ public:
    */
   void ExpandVariables();  
 
+  /**
+   * Strip Duplicate directories from Library and Include paths
+   */
+  void cmMakefile::StripDuplicateDirectories();
+      
   /** Recursivly read and create a cmMakefile object for
    *  all CMakeLists.txt files in the GetSubDirectories list.
    *  Once the file is found, it ReadListFile is called on