title: Specify Release for single project during a Debug build using cmake
body: <p>First a bit of background:</p>
  
  <p>I have an existing cmake project that uses the Visual Studio 12 generator. In Visual Studio it is possible to specify build configuration on a per project basis. EG. The Solution is set to build Debug, but one project is set to build Release. For the application that I am working on, there is a dependency that deals with very large files, and in a debug build, this dependency not only runs very slow, but also hits the memory limit on 32 bit systems (Please do no suggest fixing the memory usage as a solution because that is not feasible in the short term). This project only has one developer, so other team members do not actively debug it, the project however, is a dependency for many other parts of the application, so I would like just this project to build in release mode. I can manually specify this option through visual studio, but I would like it to be the default build functionality.</p>
  
  <p>Real Question:</p>
  
  <p><strong>How do I specify project level build configurations for cmake's Visual Studio Generator?</strong></p>