My [shared] module just exposes [domain] and contains no code, so at first it didn't generate the framework at all. I then added a

Dummy

class so it does generate the framework but the error shown above pops up.

This looks suspicious

Fixed! 🎉 In the documentation, step 6 is to specify "Other Linker Flags". That caused my linker error. By skipping this step (removing

$(inherited) -framework shared

, now the project builds and the KMP code works. Maybe the documentation is outdated for XCode 15, although step 7 (about "User Script Sandboxing") is a 15 specific thing AFAIK 🤷🏼‍♂️