title: LLVM cmake install cannot find DIA SDK
body: <p>I'm trying to build the LLVM install with cmake but it is giving me an error about the LLVM_ENABLE_DIA_SDK. I managed to build LLVM before without PDB's but I am trying to get started with libclang so I need the PDB. Cmake gives me the following error:</p>
  
  <blockquote>
    <p>CMake Error at cmake/config-ix.cmake:482 (message):<br>
      DIA SDK not found.  If you have both VS 2012 and 2013 installed, you may<br>
      need to uninstall the former and re-install the latter afterwards.<br>
    Call Stack (most recent call first):<br>
      CMakeLists.txt:575 (include)</p>
  </blockquote>
  
  <p>I have VS 2014 installed (2015 with update 3) which does have a DIA folder. Could anyone tell me how to point it to the right DIA SDK location?</p>