GENERATOR_IS_MULTI_CONFIG
New in version 3.9.
Read-only property that is true on multi-configuration generators.
True when using a multi-configuration generator such as:
Multi-config generators use CMAKE_CONFIGURATION_TYPES as the set of configurations and ignore CMAKE_BUILD_TYPE.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.20/prop_gbl/GENERATOR_IS_MULTI_CONFIG.html
