Using Xcode 4.2, how can one enable/disable “Automatic Reference Counting”?
ANSWERED Under Build Settings, flip “yes” and “no” depending whether you want ARC enabled.

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Globally:
Go to “Build Settings”, look for “Apple LLVM compiler 3.0 – Language”. Set the field
“Objective-C Automatic Reference Counting” to “No”.
For individual files:
Go to “Build Phases”, select the file, double-click the “Compiler Flags” column and put
“-fno-objc-arc” in it.