CMAKE_POLICY_DEFAULT_CMP<NNNN>ΒΆ
Default for CMake Policy CMP<NNNN> when it is otherwise left unset.
Commands cmake_minimum_required(VERSION) and
cmake_policy(VERSION) by default leave policies introduced after
the given version unset. Set CMAKE_POLICY_DEFAULT_CMP<NNNN> to OLD
or NEW to specify the default for policy CMP<NNNN>, where <NNNN>
is the policy number.
This variable should not be set by a project in CMake code; use
cmake_policy(SET) instead. Users running CMake may set this
variable in the cache (e.g. -DCMAKE_POLICY_DEFAULT_CMP<NNNN>=<OLD|NEW>)
to set a policy not otherwise set by the project. Set to OLD to quiet a
policy warning while using old behavior or to NEW to try building the
project with new behavior.