[opensource-dev] Mac viewer and Apple maintained opensource libraries

[Geir Nøklebye]

@Cinder

With reference to Xcode 8 release notes, section Deprecations it reads:

 OS X 10.11 was the last major release of macOS that supported the previously deprecated garbage collection runtime.  Applications or features that depend upon garbage collection may not function properly or will not launch in macOS Sierra. Developers should use Automatic Reference Counting (ARC) or manual retain/release for memory management instead. (20589595)

https://developer.apple.com/library/content/releasenotes/DeveloperTools/RN-Xcode/Introduction.html

This was enforced in the Xcode 8 beta program, but was eased at release, but I believe it will be reintroduced in the forthcoming 8.3 release as it again appears in the 8.3 beta release notes. 

Referring to Apple developer notes on deprecations and changes as koolaid pretty much says it all.