Support older CMake 3.14+ #53
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Some distros (Debian) still sometimes have an older version of CMake, typically 3.18. This switches away from a feature that required CMake 3.19 to support those older platforms.
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Some distros (Debian) still sometimes have an older version of CMake, typically 3.18.
This switches away from
check_source_compiles(a CMake 3.19+ feature) tocheck_cxx_source_compilesto support older CMake and those older platforms.