CMAKE_ARGC
From Get docs
Cmake/docs/3.21/variable/cmake argc
CMAKE_ARGC
Number of command line arguments passed to CMake in script mode.
When run in -P script mode, CMake sets this variable to the number of command line arguments. See also CMAKE_ARGV0, 1, 2 ...
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https://cmake.org/cmake/help/v3.21/variable/CMAKE_ARGC.html
