iPhone SDK backwards Building?

With the immi开发者_Go百科nent release of iPhone_OS_4 is there a way I can install that version and still build for the current 3.2 release? Or do I need to install OS_4 as a separate install and do all my development on the 3.2 release?

cheers gary.

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All iPhone SDK includes previous versions of SDKs.

That applies to 4.0 SDK too (which includes 3.0 — 4.0.)

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There is a drop-down menu in the top-left corner of Xcode that lets you choose what version of the SDK to build with and whether to run on a simulator or on a device.

Just select the version you want and it does the rest.