I discovered the issue was with Xcode 8.3. Since there’s an update to the clang compiler in 8.3, I’m guessing that’s the culprit.
The workaround for now is to compile with Xcode 8.2.1. I was able to get a build to compile in 8.2.1, upload it to iTunes Connect, push a test build through TestFlight, and successfully launch the game on an iPhone.
In case anyone’s not familiar with how to change what version of Xcode is used to compile a UE4 project, I wrote up a tutorial on my studio’s website about how to do that: [][1]
Hope that helps!
(I also posted this on a forum about a similar issue: [Can't Deploy C++ Project on iOS - Mobile - Epic Developer Community Forums][2])
[1]:
[2]: Can't Deploy C++ Project on iOS - Mobile - Epic Developer Community Forums