CMP0041
-------

Error on relative include with generator expression.

Diagnostics in CMake 2.8.12 and lower silently ignored an entry in the
:prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES` of a target if it contained a generator
expression at any position.

The path entries in that target property should not be relative. High-level
API should ensure that by adding either a source directory or a install
directory prefix, as appropriate.

As an additional diagnostic, the :prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES` generated
on an :prop_tgt:`IMPORTED` target for the install location should not contain
paths in the source directory or the build directory.

The ``OLD`` behavior for this policy is to ignore relative path entries if they
contain a generator expression. The ``NEW`` behavior for this policy is to report
an error if a generator expression appears in another location and the path is
relative.

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