LLVM/Clang Visual Studio build errors

I’ve installed the VS extension and tried to build some code with it. I get the following errors:

1>clang cl.exe : error : argument unused during compilation: ‘/Zi’
1>clang cl.exe : error : argument unused during compilation: ‘/MP’
1>clang cl.exe : error : argument unused during compilation: ‘/Gm-’
1>clang cl.exe : error : argument unused during compilation: ‘/EHa’
1>clang cl.exe : error : argument unused during compilation: ‘/GS’
1>clang cl.exe : error : argument unused during compilation: ‘/Gy’
1>clang cl.exe : error : argument unused during compilation: ‘/fp:precise’
1>clang cl.exe : error : argument unused during compilation: ‘/FdRelease\incore.pdb’
1>clang cl.exe : error : argument unused during compilation: ‘/Gd’

Am I correct in guessing that these are just MSVC flags that Clang’s cl.exe driver doesn’t understand yet, so it bails?

Yes. Or rather, it's not so much that it doesn't understand them, but
their functionality is not yet implemented. We're tracking this at
http://llvm.org/bugs/show_bug.cgi?id=17129

- Hans