The issue is already being discussed here: https://stackoverflow.com/questions/51602785/xcode-10b5-cant-compile-with-crashlytics
Basically I'm unable to build my app (which uses static libraries with "-ObjC" linker flag) for arm64 arch. It works without issues when building for Simulator. Is there any fix/workaround for this (except waiting for apple & downgrading to beta4 for now)?