Setting of Swift_MODULE_DIRECTORY (and probably other global directories) inappropriate.
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dabrahams commented
See this warning, which says that it's incompatible with multi-config generators. It also overrides a decision that should be the prerogative of the top level CMake project and if nothing else should be conditionalized on PROJECT_IS_TOP_LEVEL. But really it shouldn't be set at all. All of these settings artificially group files in a way that can cause builds to succeed even if dependencies have not been properly specified, or fail if properly specified, and if nothing else are likely to break all multi-config generators (which includes Xcode) for the forseeable future.