I am getting the error also on XCode Version 15.0.1 (15A507)
ld: warning: building for 'macCatalyst', but linking in dylib (/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Cocoa.framework/Versions/A/Cocoa.tbd) built for 'macOS'
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Im getting the same error.
I updated my build to IOS 14 and Mac OS 20.15.6 and the error went away.