cmake / 3.14.7 / prop_gbl / generator_is_multi_config.html /

GENERATOR_IS_MULTI_CONFIG

Read-only property that is true on multi-configuration generators.

True when using a multi-configuration generator (such as Visual Studio Generators or Xcode). Multi-config generators use CMAKE_CONFIGURATION_TYPES as the set of configurations and ignore CMAKE_BUILD_TYPE.

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https://cmake.org/cmake/help/v3.14/prop_gbl/GENERATOR_IS_MULTI_CONFIG.html