anchor.diff:  cd build64_stage0
   REM Work around VS2017 bug by using MinSizeRel.
   cmake -GNinja %cmake_flags% -DCMAKE_BUILD_TYPE=MinSizeRel ..\llvm || exit /b
  -ninja all || exit /b
  +ninja all || ninja all || ninja all || exit /b
   ninja check || ninja check || ninja check || exit /b
   ninja check-clang || ninja check-clang || ninja check-clang ||  exit /b
   cd..
  
positive.code: 
  REM Prerequisites:
  REM
  REM   Visual Studio 2017, CMake, Ninja, SVN, GNUWin32, 
  REM   NSIS with the strlen_8192 patch,
  REM   Visual Studio 2017 SDK and Nuget (for the clang-format plugin),
  REM   Perl (for the OpenMP run-time).
  
negative.code: set CC=..\build32_stage0\bin\clang-cl
  set CXX=..\build32_stage0\bin\clang-cl
  cmake -GNinja %cmake_flags% ..\llvm || exit /b
  ninja all || ninja all || ninja all || exit /b
  ninja check || ninja check || ninja check || exit /b
  ninja check-clang || ninja check-clang || ninja check-clang ||  exit /b
  ninja package || exit /b
  