One Quickie

Treat warnings as errors (Xcode->General)
In Xcode, there's a handy "Treat Warnings as Errors" checkbox. I usually use the search dealie with "werr" to find the setting.

(In Project Builder, open the Targets tab, double-click the target, go to the "Build Settings" tab, scroll down to Build Settings, look for WARNING_CFLAGS. Edit that, and add -Werror to what's already there.)

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