Apple Mach-O Linker (ld) Error Group with Swift 3 & Xcode 9 GM

Update 15 Sept 2017:

Official response from Apple:

Our apologies. For apps using Swift 3.2 or Swift 4.0, several AVFoundation
capture APIs (public extensions on external protocol) were inadvertently
marked private in Xpre 9. The following AVFoundation API are temporarily
unavailable:

• AVCaptureDevice.Format.supportedColorSpaces

• AVCaptureDevice.supportedFlashModes

• AVCapturePhotoOutput.availablePhotoPixelFormatTypes

• AVCapturePhotoOutput.availableRawPhotoPixelFormatTypes

• AVCapturePhotoSettings.availablePreviewPhotoPixelFormatTypes

As a workaround you can use the SwiftPrivate versions of these API by
prepending each API with double underscore (

__

). For example, change

AVCaptureDevice.Format.supportedColorSpaces

to

AVCaptureDevice.Format.__supportedColorSpaces

.

I can confirm using

__availablePreviewPhotoPixelFormatTypes

E.g.

let settings = AVCapturePhotoSettings()let previewPixelType = settings.__availablePreviewPhotoPixelFormatTypes.first!

Source: https://forums.developer.apple.com/thread/86810#259270