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  • Brad King's avatar
    Compile CMake as C++17 if supported by the compiler · 31d59ff3
    Brad King authored
    Add a check that a simple source file can compile as C++17 that uses
    some of the features we need.  Do this only when hosted by CMake 3.8
    or above because those versions are aware of C++17.
    
    Check for unordered_map as we do in bootstrap since commit 375eca78
    (bootstrap: Check support for unordered_map from compiler mode,
    2017-11-30).  Also maintain the existing C++14 cstdio check.
    31d59ff3