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- CMAKE_GENERATOR_INSTANCE
- ------------------------
- 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 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 :variable:`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:
- * For the :generator:`Visual Studio 15 2017` generator (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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