Clarifying some of the requirements for building with Visual Studio on Windows. Namely, we require the latest Update to be installed (for sanity purposes), and we require CMake 2.8.12.2 for building LLVM with Visual Studio.

llvm-svn: 264779

Author: AaronBallman

llvm/docs/GettingStartedVS.rst

@@ -45,10 +45,12 @@ approximately 3GB.
 
 Software
 --------
-You will need Visual Studio 2013 or higher.
+You will need Visual Studio 2013 or higher, with the latest Update installed. 
 
 You will also need the `CMake <http://www.cmake.org/>`_ build system since it
-generates the project files you will use to build with.
+generates the project files you will use to build with. CMake 2.8.12.2 is the
+minimum required version for building with Visual Studio, though the latest
+version of CMake is recommended.
 
 If you would like to run the LLVM tests you will need `Python
 <http://www.python.org/>`_. Version 2.7 and newer are known to work. You will