CMP0121 ------- .. versionadded:: 3.21 The :command:`list` command now detects invalid indices. Prior to CMake version 3.21, the :command:`list` command's ``GET``, ``INSERT``, ``SUBLIST``, and ``REMOVE_AT`` subcommands did not detect invalid index arguments. The ``OLD`` behavior of this policy is for invalid indices to be treated as their integer value (if any) at the start of the string. For example, ``2good4you`` is a ``2`` and ``not_an_integer`` is a ``0``. The ``NEW`` behavior is for invalid indices to trigger an error. This policy was introduced in CMake version 3.21. 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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