New in version 3.11.
Generator-specific instance specification provided by user.
Some CMake generators support selection of an instance of the native build system when multiple instances are available. If the user specifies an instance (e.g. by setting this cache entry or via the
CMAKE_GENERATOR_INSTANCE environment variable), or after a default instance is chosen when a build tree is first configured, the value will be available in this variable.
The value of this variable should never be modified by project code. A toolchain file specified by the
CMAKE_TOOLCHAIN_FILE variable may initialize
CMAKE_GENERATOR_INSTANCE as a cache entry. Once a given build tree has been initialized with a particular value for this variable, changing the value has undefined behavior.
Instance specification is supported only on specific generators:
Visual Studio 15 2017generator (and above) this specifies the absolute path to the VS installation directory of the selected VS instance.
See native build system documentation for allowed instance values.
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