[CMake] problem: using options other than -D with VS.NET

[Brad King]

Erik van der Wal wrote:
> Seems like ADD_DEFINITIONS only allows -D options?

That is correct.  The command is called ADD_DEFINITIONS, not ADD_FLAGS. 
  Implementing it to take the "-D" part explicitly was a bad choice in 
hindsight because it allows the command to be abused to add other flags. 
  This use of the command is not officially supported, though.

-Brad