Why is the icon for my iPhone app crossed-out after a build?

I have just built my first iPhone app, but its icon appears crossed-out. I do have some warnings when I build the c开发者_开发百科ode, but why would they cause the app icon to cross? My app has no errors.

Here is what the icon looks like:

This is completely fine! It just means that your app can't execute on your mac, which is exactly what you want, with an iOS Device build.

(If you ever do a build that doesn't have that cross on it, you've accidentally built your app for the simulator. Good to know, for a subtle future issue that might pop up.)