With Xcode 8.3b3, the app compiles and launches with -O for the first time ever! (we've been shipping with -Onone 😱)
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Same for my Swift/Obj-C combined project. Was crashing in NSArray bridging in optimized builds before b3.
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Nice! We'll try -O with our app. Before, swiftc was randomly swizzling '() -> Void' closures. That caused some weird bugs.
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great news! I need to test it with my projects then (had the same issue).