CMP0211
-------

.. versionadded:: 4.4

A file may belong to at most one :ref:`file set <file sets>` in a target.

In CMake 4.3 and below, it was possible to specify the same file
in multiple file sets in a target.  In CMake 4.4 and above, a file
may belong to at most one file set in a target.  This policy provides
compatibility for projects that have not been updated accordingly.

The ``OLD`` behavior for this policy is to accept the same file in
multiple file sets in a target.  The ``NEW`` behavior for this policy
is to accept a given file in at most one file set in a target.

.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 4.4
.. |WARNS_OR_DOES_NOT_WARN| replace::
    warns when a file is part of multiple file sets in a target
.. include:: include/STANDARD_ADVICE.rst

.. include:: include/DEPRECATED.rst