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: 
  :Help
  setlocal
  echo "Usage: dev_env.bat <compiler_arch>  [<target-os>  [<vc_version>]]"
  echo "  <compiler_arch> : 'x86' | 'x64'"
  echo "  <target-os>     : '8.1' | '10' (default)"
  echo "  <vc_version>    :"
  echo "    '14.20' (i.e. VS 2019)"
  
negative.code: call "C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Auxiliary\Build\vcvarsall.bat" %ARCH% %TARGET% -vcvars_ver=%VCVER%
  
  :: Setup Clcache
  set CLCACHE_DIR=C:\clcache\%PROJECT%-%ARCH%-%TARGET%-%VCVER%
  set CLCACHE_HARDLINK=1
  :: set CLCACHE_SERVER=1
  set CLCACHE_CL=
  