tree 496f8fae5d48677d97df29b082771aa31fe76218
parent 7b07ccdd2b8d621211ee1642e8b62b005b0cd60f
author Brad King <brad.king@kitware.com> 1591965692 -0400
committer Brad King <brad.king@kitware.com> 1592488325 -0400

Deprecate compatibility with CMake versions older than 2.8.12

Issue a deprecation warning on calls to `cmake_minimum_required` or
`cmake_policy` that set policies based on versions older than 2.8.12.
Note that the effective policy version includes `...<max>` treatment.
This is important in combination with commit ca24b70d31 (Export: Specify
a policy range in exported files, 2020-05-16, v3.18.0-rc1~133^2).