It took quite a sequence of topics to understand this issue. To boil it down, Swift 5 binaries built with Xcode 10.2 require the Swift 5 Runtime Support for Command Line Tools, which are not included in macOS < 10.14.4 (must be directly downloaded from More Downloads in Apple Developer). As of 11 da…

Keeping discussion to one thread: Xcode 10.2 image released

Latest Xcode image (10.2) has drawbacks with the image OS (10.14.3)

halfer April 15, 2019, 9:32pm 3

Looks like this has also been raised on this thread:

Xcode 10.2 image released

Topic		Replies	Views
Xcode 10.2 image released Announcements ios , macos	23	8056	May 20, 2019
Xcode 10.2.1 image released Announcements ios , xcode , macos	23	6938	July 23, 2019
Xcode 10 image has old version of Mac OS, certain command line tools fail Build Environment ios	2	4735	December 21, 2018
Update Xcode 10.2 version Build Environment ios , xcode	13	3402	April 10, 2019
Xcode 10.2 support (Coomand line tools) Mobile xcodebuild	5	1947	April 15, 2019