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An example where this was solved: "is attached to multiple targets"

Solution explained here (CMAKE_XCODE_BUILD_SYSTEM):

1 The original Xcode build system. This is the default when using Xcode 11.x or below.

and here (Toolset and Build System Selection):

For example, to select the original build system under Xcode 12, run cmake(1) with the option -T buildsystem=1.

(Not a Mac guy. Maybe one will wander by and confirm this or offer a better solution.)
An example where this was solved: "is attached to multiple targets"

Solution explained here (CMAKE_XCODE_BUILD_SYSTEM):

1 The original Xcode build system. This is the default when using Xcode 11.x or below.

and here (Toolset and Build System Selection):

For example, to select the original build system under Xcode 12, run cmake(1) with the option -T buildsystem=1.