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As contribs keep being updated with newer versions of the language, we need to support a more modern version of C++ going forward. Setting -std=c++17 should not break existing contribs that are built with C++11 or C++14. In fact we already support the mix of versions between 11 and 14 without problem. Modern C++ compilers are designed to take care of this [1]. When switching to a new C++ version there might however be some slight differences on how the code is interpreted. These differences [2] might trigger some build errors for removed parts. [1] https://stackoverflow.com/questions/46746878/is-it-safe-to-link-c17-c14-and-c11-objects [2] https://www.open-std.org/JTC1/SC22/WG21/docs/papers/2018/p0636r3.html