forgive my ignorant

see more on

http://social.msdn.microsoft.com/Forums/vstudio/en-US/32c1a855-579d-4bec-9fc2-ff6e56936cb1/which-license-does-the-cc-compiler-of-visual-studio-use#7594c08e-8d5c-4ba2-af84-2b731b8e4e9c
准备添加界面