Full path to the cmake(1) -P script file currently being processed.
When run in cmake(1) -P script mode, CMake sets this variable to the full path of the script file. When run to configure a CMakeLists.txt file, this variable is not set.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.5/variable/CMAKE_SCRIPT_MODE_FILE.html