New in version 3.9.
If enabled, the Xcode generator will generate schema files. These are useful to invoke analyze, archive, build-for-testing and test actions from the command line.
This variable initializes the XCODE_GENERATE_SCHEME target property on all targets.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/variable/CMAKE_XCODE_GENERATE_SCHEME.html