CMAKE_ARGV0
Command line argument passed to CMake in script mode.
When run in -P script mode, CMake sets this variable to the first command line argument. It then also sets CMAKE_ARGV1, CMAKE_ARGV2, … and so on, up to the number of command line arguments given. See also CMAKE_ARGC.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.5/variable/CMAKE_ARGV0.html