CMP0041
-------

.. |REMOVED_IN_CMAKE_VERSION| replace:: 4.0
.. include:: REMOVED_PROLOGUE.txt

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.

.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.0
.. |WARNED_OR_DID_NOT_WARN| replace:: warned
.. include:: REMOVED_EPILOGUE.txt