Apple mandates that all devs do the 64-bit app dance come February

Apple to require 64-bit support from all iOS apps starting in February
Beginning in February 1, all new iOS apps that are submitted for App Store approval, should have 64-bit support, building on the iOS 8 SDK that comes with the Xcode 6 and up programming language. or later. "To enable 64-bit in your project, we recommend using the default Xcode build setting of "Standard architectures" to build a single binary with both 32-bit and 64-bit code," says Apple.

The company was the first to release a 64-bit-capable modern mobile chipset with the venerable A7 in the iPhone 5s, and things took off from there. The stock iOS apps were fully rewritten to take advantage of the 64-bit architecture, and now Apple demands the same from all developers, as, naturally, the new A8 chip is 64-bit as well, and very, very powerful on a per-clock basis. 

Now, Qualcomm and Samsung, with their Snapdragon and Exynos chipset lines, respectively, are also following suit, releasing 64-bit silicon. The next major Android 5.0 Lollipop version does embrace it, too, but apps will have a lot more catching up to do, so Apple will likely retain the 64-bit headstart here for a while longer.

source: AppleInsider

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