anchor.diff:  :: DIA SDK not included in Express editions
   echo Visual Studio 2013 Express does not include the DIA SDK. ^
   You need Visual Studio 2013 Community (free).
  -echo See: https://github.com/dotnet/coreclr/blob/master/Documentation/developer-guide.md#prerequisites
  +echo See: https://github.com/dotnet/coreclr/blob/master/Documentation/project-docs/developer-guide.md#prerequisites
   exit /b 1
   
   :GenVSSolution
  
positive.code: :: Check presence of VS
  if defined VS%__VSProductVersion%COMNTOOLS goto CheckVSExistence
  echo Visual Studio 2013 Community (free) is a pre-requisite to build this repository.
  echo See: https://github.com/dotnet/coreclr/blob/master/Documentation/developer-guide.md#prerequisites
  exit /b 1
  
  :CheckVSExistence
  :: Does VS 2013 or VS 2015 really exist?
  if exist "!VS%__VSProductVersion%COMNTOOLS!\..\IDE\devenv.exe" goto CheckMSBuild
  echo Visual Studio 2013 Community (free) is a pre-requisite to build this repository.
  echo See: https://github.com/dotnet/coreclr/blob/master/Documentation/developer-guide.md#prerequisites
  exit /b 1
  
  :CheckMSBuild
  
negative.code: set UseRoslynCompiler=true
  :CheckMSBuild14
  if not exist %_msbuildexe% set _msbuildexe="%ProgramFiles%\MSBuild\14.0\Bin\MSBuild.exe"
  if not exist %_msbuildexe% echo Error: Could not find MSBuild.exe.  Please see https://github.com/dotnet/coreclr/blob/master/Documentation/project-docs/developer-guide.md for build instructions. && exit /b 1
  
  :: All set to commence the build
  
  