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The immediate driver for this change is related when fetching GTest. Currently we are stuck with GTest-1.12.1 because is the latest version supporting C++11. Later versions require C++14.
However, GTest-1.12.1 has a CMakeLists.txt with
cmake_minimum_required(VERSION 3.5)
which causes the following warning with modern CMake versions:Updating to >= C++14 allows us to use GTest-1.15.2 which has a
cmake_minimum_required(VERSION 3.13)