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OS X Lion Apps Require Xcode 4.1 [Update: Released]

So, Apple released the first developer preview of OS X 10.7 Lion today. While we’re updating our post with all the details as they come in, we have noticed on the developer website that Xcode 4.1 will be required to build apps for Lion.

You will need to build and compile your apps for Lion using Xcode 4.1 Developer Preview. This version of Xcode is only for developing and testing your apps for Lion. Continue to use Xcode 3.2.5 on a Snow Leopard partition if you plan to submit Mac or iOS apps to the App Store.

The new build of Xcode isn’t available yet, the Dev Center is under heavy traffic right now, but we’ll keep you posted as Apple releases Xcode 4.1 to developers.

Update: Xcode 4.1 developer preview is now available in the Dev Center.

This is a pre-release version of Xcode 4.1 for both Mac and iOS development. This release requires Mac OS X Lion and includes iOS SDK 4.2. Continue to use Xcode 3.2.5 on a Snow Leopard partition if you plan to submit Mac or iOS apps to the App Store.

What’s New in Xcode 4.1

• Support for Mac OS X 10.7 Lion

• Xcode 4 has a brand new, single window interface for all major workflows

• Interface Builder is now integrated within the main Xcode IDE

• Assistant shows a paired editor with complementary files, e.g.: header or UI controller

• Version editor shows a live comparison through SCM history, using Git or Subversion

• Live Issues display coding errors as you type, and Fix-it can correct the mistake for you

• Tabs save a unique screen layout for each task, e.g. debugging, editing, designing

• LLVM compiler 2.0 includes full support for C, Objective-C, and now C++

• LLDB debugger is faster, and uses less memory than the GDB debugging engine

• Instruments adds System Trace, and new iOS instruments including OpenGL ES

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