Disallowed. See CMake Policy CMP0029.
Does nothing.
subdir_depends(subdir dep1 dep2 ...)
Does not do anything. This command used to help projects order parallel builds correctly. This functionality is now automatic.
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© 2000–2011 Insight Software Consortium
Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.7/command/subdir_depends.html