Just adding to oasisweng's answer.
Does one of the following help?:
- Every time I upgrade Xcode, I get linker errors with brew installed GCCEvery time I upgrade Xcode, I get linker errors with brew installed GCC
- Are you reliant on any dependencies that do not have Bitcode enableddo not have Bitcode enabled?
- Similar error reported at the Unity forum; see last post in thread