The Compiler is Your Friend

Which compiler warnings should I enable for my iOS/Mac app project? How do I enable warnings that Xcode doesn't have a checkbox for? How do I disable warnings (either completely, for specific files, or in specific sections of code?) Where do I go to find out what warnings are available? How do I enable warnings for my own code, but disable them for third-party code that I compile into my bundle? What about warnings that are triggered in third-party headers?

I did a talk on compiler warnings at the HelsinkiOS/CocoaHeads April 2013 meetup that answers all of the above questions. The slides are available at Speaker Deck, and embedded in this post below.