CMake/Help/policy/CMP0085.rst

CMP0085
-------

.. versionadded:: 3.14

``$<IN_LIST:...>`` handles empty list items.

In CMake 3.13 and lower, the ``$<IN_LIST:...>`` generator expression always
returned ``0`` if the first argument was empty, even if the list contained an
empty item. This behavior is inconsistent with the ``IN_LIST`` behavior of
:command:`if`, which this generator expression is meant to emulate. CMake 3.14
and later handles this case correctly.

The ``OLD`` behavior of this policy is for ``$<IN_LIST:...>`` to always return
``0`` if the first argument is empty. The ``NEW`` behavior is to return ``1``
if the first argument is empty and the list contains an empty item.

.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 3.14
.. |WARNS_OR_DOES_NOT_WARN| replace:: warns
.. include:: STANDARD_ADVICE.txt

.. include:: DEPRECATED.txt