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Help: Document that policies are not feature toggles.

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Stephen Kelly 2014-10-20 22:20:42 +02:00
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Help/manual/cmake-policies.7.rst
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@ -20,6 +20,12 @@ for a policy, also avoiding the warning. Each policy can also be set to
either ``NEW`` or ``OLD`` behavior explicitly on the command line with the
:variable:`CMAKE_POLICY_DEFAULT_CMP<NNNN>` variable.
Note that policies are not reliable feature toggles. A policy should
almost never be set to ``OLD``, except to silence warnings in an otherwise
frozen or stable codebase, or temporarily as part of a larger migration
path. The ``OLD`` behavior of each policy is undesirable and will be
replaced with an error condition in a future release.
The :command:`cmake_minimum_required` command does more than report an
error if a too-old version of CMake is used to build a project. It
also sets all policies introduced in that CMake version or earlier to