Included scripts do automatic
cmake_policy() PUSH and POP.
In CMake 2.6.2 and below, CMake Policy settings in scripts loaded by the
find_package() commands would affect the includer. Explicit invocations of
cmake_policy(POP) were required to isolate policy changes and protect the includer. While some scripts intend to affect the policies of their includer, most do not. In CMake 2.6.3 and above,
find_package() by default
POP an entry on the policy stack around an included script, but provide a
NO_POLICY_SCOPE option to disable it. This policy determines whether or not to imply
NO_POLICY_SCOPE for compatibility. The
OLD behavior for this policy is to imply
find_package() commands. The
NEW behavior for this policy is to allow the commands to do their default cmake_policy
This policy was introduced in CMake version 2.6.3. CMake version 3.19.0-rc3 warns when the policy is not set and uses
OLD behavior. Use the
cmake_policy() command to set it to
OLD behavior of a policy is
deprecated by definition and may be removed in a future version of CMake.
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