mirror of
https://github.com/Kitware/CMake.git
synced 2026-01-04 12:49:36 -06:00
b5f8113ca7
The old behavior of $<IN_LIST:...> is inconsistent with that of if(IN_LIST), in that it does not find an empty search item even if the list contains empty items. This change adds a new policy to correctly handle empty items and make the behavior more consistent with if(IN_LIST). Fixes: #18556
22 lines
885 B
ReStructuredText
22 lines
885 B
ReStructuredText
CMP0085
|
|
-------
|
|
|
|
``$<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
|