One Quickie

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Enabling "control reaches end of non-void function" (Xcode->General)

One nice gcc warning that's not enabled by default is one that complains if you exit from a function (by falling off the end) without returning anything. This is an easy error to make, and can be hard to track down (especially if you do it in an objective-C init method). To enable this warning, add "-Wreturn-type" to the "Other C Flags" setting in your favorite build style.