also, I am far from a cmake expert, but I looked in the CMakeFiles and
cannot find where they
- try to run the compiler with --std=c++17
- fail the build if that does not work with a message that makes it
clear that the compiler doesn't work --std=c++17
- if it works, add --std=c++17 to the compiler invocations, because
requiring a c++17 compiler is fine, but one can't assume that it
uses it by default
Maybe it does all that and my cmake-fu is too weak.
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