CMP0001 ------- ``CMAKE_BACKWARDS_COMPATIBILITY`` should no longer be used. The behavior is to check ``CMAKE_BACKWARDS_COMPATIBILITY`` and present it to the user. The ``NEW`` behavior is to ignore CMAKE_BACKWARDS_COMPATIBILITY completely. In CMake 2.4 and below the variable ``CMAKE_BACKWARDS_COMPATIBILITY`` was used to request compatibility with earlier versions of CMake. In CMake 2.6 and above all compatibility issues are handled by policies and the :command:`cmake_policy` command. However, CMake must still check ``CMAKE_BACKWARDS_COMPATIBILITY`` for projects written for CMake 2.4 and below. This policy was introduced in CMake version 2.6.0. CMake version |release| warns when the policy is not set and uses ``OLD`` behavior. Use the :command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly. .. include:: DEPRECATED.txt
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