forums.swift.org/t/a-logger-symbol-missing-on-macos-15-kept-my-mac-app-from-launching/90412 A Logger symbol missing on macOS 15 kept my Mac app from launching
Built for macOS 15 with Xcode 27.1, a macOS app crashed at launch because Logger.isEnabled(type:) was listed in the SDK but missing from libswiftos.dylib on macOS 15.6.1. The post covers diagnosis, an OSLog fix and a script comparing executable imports with system library exports.
