anchor.diff:  copy C:\tools\Python35-%ARCH%\Scripts\clcache.exe C:\clcache\cl.exe
   set PATH=C:\clcache;%PATH%
   
  +if "%PROJECT%"=="xdk" (
  +  call "clcache.exe" -M 3000000000
  +)
   :: if we need to change cache max size: clcache -M <size-in-bytes>
   
   set IMAGE_NAME=windows-%SHORT_TARGET%-%ARCH%-vc%VCVER%
  
positive.code: :: check input arguments
  if %1.==. (
    echo "No arch"
    call :Help
    goto :eof
  )
  
negative.code: 
  :Help
  setlocal
  echo "Usage: dev_env.bat <compiler_arch>  <project>  [<target-os>  [<vc_version>]]"
  echo "  <compiler_arch> : 'x86' | 'x64'"
  echo "  <project>       : 'xdk' | 'otb'"
  echo "  <target-os>     : '8.1' | '10' (default)"
  echo "  <vc_version>    :"
  echo "    '14.20' (i.e. VS 2019)"
  