I'm working getting a large app to Universal Binary, which uses a number of libraries and frameworks with third-party dependencies, a few of which are not yet available as arm64.
If a framework is marked as Optional in the app's build settings, the app will still link when it is absent.
I expected that if the framework only had one architecture needed for UB (e.g. just x86_64), we should be able to optionally link it successfully, and it would not matter if one architecture was missing.
However this isn't how Xcode handles it, we get a linker error for the missing architecture even if the framework is optional.
Is there a way to do what I'm expecting? Include an optional framework with only one architecture in a UB app, with the app taking responsibility for correct handling of the framework at runtime (just as it would for a missing optional framework in a single-architecture app)?