Help/policy/CMP0011.rst
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Included scripts do automatic :command:cmake_policy PUSH and POP.
In CMake 2.6.2 and below, CMake Policy settings in scripts loaded by
the :command:include and :command:find_package commands would affect
the includer. Explicit invocations of cmake_policy(PUSH) and
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, :command:include and
:command:find_package by default PUSH and 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
NO_POLICY_SCOPE for :command:include and :command:find_package commands.
The NEW behavior for this policy is to allow the commands to do
their default cmake_policy PUSH and POP.
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