After updated MAC OS I am getting this error in swift version 16.0 and MAC OS VERSION 15.0.1
note: Disabling previews because SWIFT_VERSION is set and SWIFT_OPTIMIZATION_LEVEL=-O, expected -Onone (in target 'Closures' from project 'Pods')
Showing Recent Messages Disabling previews because SWIFT_VERSION is set and SWIFT_OPTIMIZATION_LEVEL=-O, expected -Onone
If you create a new test project from one of the built-in templates, does it have the same problem?
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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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That is a build log message pointing out that the Closures target in the Pods project is not built with -Onone which is necessary if the target is used when running Previews.
It's not an error, just a build log "note:". If you indeed intend to build this project with optimizations then you can ignore it.