ARSample build takes forever, or does it? Xcode 9.0 beta 4

Has anyone been able to build the ARSample scheme in Xcode 9 beta 4? When I try to build it, it just sits there without any errors. Doesn’t seem to go anywhere.

Edit: As I type, I did get a warning, but that warning took almost 20-30 minutes to show up.

Builds for the supporting schemes went without a problem.

I take that back. I’m viewing the build output and it appears to be going. Albeit this has been a very slow process.

Once you build initially which takes a long time due to shader compiling and such, it seems to go pretty fast for me. Probably less than a minute to push to device.

I am on Xcode 9 beta 5 for what it is worth.