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CMP0027
-------

Conditionally linked imported targets with missing include directories.

CMake 2.8.11 introduced introduced the concept of
:prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES`, and a check at cmake time that the
entries in the :prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES` of an ``IMPORTED``
target actually exist.  CMake 2.8.11 also introduced generator expression
support in the :command:`target_link_libraries` command.  However, if an
imported target is linked as a result of a generator expression evaluation, the
entries in the :prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES` of that target were not
checked for existence as they should be.

The ``OLD`` behavior of this policy is to report a warning if an entry in
the :prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES` of a generator-expression
conditionally linked ``IMPORTED`` target does not exist.

The ``NEW`` behavior of this policy is to report an error if an entry in
the :prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES` of a generator-expression
conditionally linked ``IMPORTED`` target does not exist.

This policy was introduced in CMake version 3.0.  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