Property settings to generate debug information in a release mode.

A couple of points from a book (Debugging applications fro MS.Net and MS Windows) I am currently read.

/OPT:REF tells the linker to bring in only functions that your program calls directly. OPT:ICF switch will combine identical data COMDAT recrods when ncessary so that you'll have only one constant data variable for all reference to that constant value.