fix: silence the warnings from ExternalProject_Add #1972
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CMake 3.24 introduced a change in behavior in ExternalProject_Add() regarding timestamps when extracting an archive. As updating the code would break compatibility with older CMake versions, this commit instead tells newer CMake versions to behave like older ones, using a policy setting. Note from the CMake docs: The OLD behavior of a policy is deprecated by definition and may be removed in a future version of CMake. -> so the code will have to be updated eventually, and compatibility be broken...
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CMake 3.24 introduced a change in behavior in ExternalProject_Add() regarding timestamps when extracting an archive.
As updating the code would break compatibility with older CMake versions, this commit instead tells newer CMake versions to behave like older ones, using a policy setting.
Note from the CMake docs:
The OLD behavior of a policy is deprecated by definition and may be removed in a future version of CMake.
-> so the code will have to be updated eventually, and compatibility be broken...