Darwinbuild is a collection of tools that assist compilation of the many projects contained in Darwin, the open source base of Apple's macOS operating system.
Oddly, GitHub doesn’t seem to want to create a PR for the matching change in PureDarwin-System-Plist right now. You can view the required changes in the add_xnu_patch branch of my fork.
This patch suppresses warnings emitted by the version of
clang
included in Xcode 9. These warnings prevented XNU from building, as it uses-Werror
.