Path to top of source tree. Same as CMAKE_SOURCE_DIR.
This is an internal cache entry used to locate the source directory when loading a CMakeCache.txt from a build tree. It should not be used in project code. The variable CMAKE_SOURCE_DIR has the same value and should be preferred.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.19/variable/CMAKE_HOME_DIRECTORY.html