How do you enable ARC project-wide in Xcode 4.2

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“ARC is available in Xcode 4.2, currently in beta, and only when
compiling with Clang (a.k.a. “Apple LLVM compiler”). The setting is
called, obviously enough, “Objective-C Automatic Reference Counting”.
Turn it on, and off you go.

If you’re working on existing code, changing this setting will produce
an enormous quantity of errors. ARC not only manages memory for you,
but it forbids you from trying to do it yourself. It’s illegal to
manually send retain/release/autorelease when using ARC. Since normal
non-ARC Cocoa code is littered with this stuff, you’ll get a lot of
errors.

Fortunately, Xcode offers a tool to convert existing code. Select Edit
-> Refactor… -> Convert to Objective-C ARC… and Xcode will guide you through converting your code. Although there may be some
situations where it needs help figuring out what to do, the process
should be largely automatic.”

I took that from this link, helped me a lot:
http://www.mikeash.com/pyblog/friday-qa-2011-09-30-automatic-reference-counting.html

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