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j.santos.f's reply pointed me to the right direction. Thanks for that.In my case, the build hangs on my own project, not on a Carthage/Cocoapods dependency. While it is a compiler bug for the compiler to hang, it might still be a bug in your code that causes this (like in mine).The compiler bug that was fixed is this one: https://bugs.swift.org/browse/SR-11010Going from the example in the bug report, I checked the places where I was using a while loop. Turns out I have a similar while loop that was looking up super views.var cell = self.superview while !(cell is UITableViewCell) { cell = cell?.superview } return cell as? UITableViewCellThewhile loop will go forever if `cell` is nil. So the fix is:var cell = self.superview while cell != nil && !(cell is UITableViewCell) { cell = cell?.superview } return cell as? UITableViewCellWith this code change, archiving works with the Optimized for Speed (-O) option.Hopefully this could help you if you have something similar, or at least point you to the right direction.