CMAKE_XCODE_GENERATE_TOP_LEVEL_PROJECT_ONLY

If enabled, the Xcode generator will generate only a single Xcode project file for the topmost project() command instead of generating one for every project() command.

This could be useful to speed up the CMake generation step for large projects and to work-around a bug in the ZERO_CHECK logic.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.15/variable/CMAKE_XCODE_GENERATE_TOP_LEVEL_PROJECT_ONLY.html