anchor.diff:  
   :check_change_of_unittest_error
   echo 1 > %cache_dir%\error_code.txt
  +type %cache_dir%\error_code.txt
   exit /b 1
   
   
   :timestamp
  -echo on
   setlocal enabledelayedexpansion
   set start=%~1
   set dd=%start:~2,2%
  
positive.code: 
  :build_error
  echo 7 > %cache_dir%\error_code.txt
  echo Build Paddle failed, will exit!
  exit /b 7
  
  
negative.code: rem =================================================
  
  @ECHO ON
  setlocal
  
  rem -------clean up environment-----------
  set work_dir=%cd%
  