URLSessionTaskMetrics Linker Error on watchOS 3.0+

Number:rdar://36082113 Date Originated:December 15 2017, 2:34 PM
Status:Open Resolved:
Product:Developer Tools Product Version:Xcode 9.2
Classification:Bug Reproducible:Always
We're seeing linker errors with the URLSessionTaskMetrics API on watchOS 3.0+ in Alamofire. I wanted to make sure we filed a radar since the APIs are available to the compiler, but are failing to link the symbols. I've created a sample project on GitHub.

- https://github.com/Alamofire/Rdar-URLSessionTaskMetrics

Steps to Reproduce:
1) Download the sample app
2) Compile the `Alamofire iOS` scheme with Xcode 9.2 and observe that it compiles successfully
3) Compile the `Alamofire watchOS` scheme with Xcode 9.2 and observe that it fails to link because it is missing the NSURLSessionTaskMetrics symbol

Expected Results:
That the `Alamofire watchOS` scheme would compile.

Actual Results:
That the `Alamofire watchOS` scheme fails to link.

Xcode 9.2 (9C40b)

Alamofire watchOS


Adding CFNetwork to your linked frameworks should fix this issue.

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