New in version 3.12.
OFF, which is default, then CMake adds a special target on which all other targets depend that checks the build system and optionally re-runs CMake to regenerate the build system when the target specification source changes.
If this variable evaluates to
ON at the end of the top-level
CMakeLists.txt file, CMake will not add the regeneration target to the build system or perform any build system checks.
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