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I'm looking to know what versions of iOS are supported and what versions of XCode are supported. Specifically, is iOS 3.1.3 supported or not, and is XCode 4 supported or not. I was not able to find any information on this anywhere in any documentation or the forums, so appreciate your help with a quick answer as we are evaluating options for replacing an existing solution for our games.

We support XCode 3.x and 4.x
Under 4.x we have found a minor problem during compilation due to a missing compiler flag.
I am not sure why it happens only for XCode4.
Anyways it's easily solved. You go to the Target settings window, scroll down to the "Other Linker Flags" and add -zl

Make sure to show all parameters in that window, don't use the "Basic" view because it hides the parameter.

hope it helps