CMAKE_GENERATOR

This is a CMake Environment Variable. Its initial value is taken from the calling process environment.

Specifies the CMake default generator to use when no generator is supplied with -G. If the provided value doesn’t name a generator known by CMake, the internal default is used. Either way the resulting generator selection is stored in the CMAKE_GENERATOR variable.

Some generators may be additionally configured using the environment variables:

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https://cmake.org/cmake/help/v3.17/envvar/CMAKE_GENERATOR.html