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CMP0021
-------
Fatal error on relative paths in :prop_tgt:`INCLUDE_DIRECTORIES` target
property.
CMake 2.8.10.2 and lower allowed the :prop_tgt:`INCLUDE_DIRECTORIES` target
property to contain relative paths. The base path for such relative
entries is not well defined. CMake 2.8.12 issues a ``FATAL_ERROR`` if the
:prop_tgt:`INCLUDE_DIRECTORIES` property contains a relative path.
The ``OLD`` behavior for this policy is not to warn about relative paths
in the ``INCLUDE_DIRECTORIES`` target property. The ``NEW`` behavior for this
policy is to issue a ``FATAL_ERROR`` if ``INCLUDE_DIRECTORIES`` contains a
relative path.
This policy was introduced in CMake version 2.8.12. 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