CMP0057
Warning
The OLD behavior of this policy was removed in CMake version 4.0. This policy must be set to NEW by a call to cmake_minimum_required() or cmake_policy().
Added in version 3.3.
Support new if() IN_LIST operator.
CMake 3.3 adds support for the new IN_LIST operator.
The OLD behavior for this policy is to ignore the IN_LIST operator. The NEW behavior is to interpret the IN_LIST operator.
This policy was introduced in CMake version 3.3. Prior to removal in CMake version 4.0, it could be set by cmake_policy() or cmake_minimum_required(). If it was not set, CMake warned, and used OLD behavior.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/latest/policy/CMP0057.html
