title: Eclipse shows errors but project compile fine
body: <p>I have a c++ project in Eclipse 4.2.1.  It compiles with no errors with external makefile on command line.  However, eclipse shows lots of warnings for functions like "Method 'push_back' could not be resolved" for the vector class.  Any help to get rid of these errors would be much appreciated.</p>
  
  <p>Thanks</p>