https://github.com/Kitware/CMake
Revision ffb9978e95ecab961f90be39e9a1225fdf6c0ae3 authored by Brad King on 16 September 2021, 12:23:17 UTC, committed by Kitware Robot on 16 September 2021, 12:24:56 UTC
1230ceb97e Help: Improve explanation on CMAKE_POLICY_WARNING warnings occur Acked-by: Kitware Robot <kwrobot@kitware.com> Merge-request: !6522
Tip revision: ffb9978e95ecab961f90be39e9a1225fdf6c0ae3 authored by Brad King on 16 September 2021, 12:23:17 UTC
Merge topic 'clarify_cmake_policy_warning_doc'
Merge topic 'clarify_cmake_policy_warning_doc'
Tip revision: ffb9978
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.
This policy was introduced in CMake version 3.14. 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
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