Fixes #483. Move to use CACHE INTERNAL #485
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Closes #483
This PR updates the main CMake from using
PARENT_SCOPEtoCACHE INTERNAL. The former seemed to have issues when pFUnit was used viaFetchContentfrom a subdirectory. The latter is a bit of a sledgehammer, but makes sure variables are defined in all scopes.We also update a few bits of CMake to avoid some warnings:
cmake_minimum_requiredto 3.12COMMENTas CMake expects a single argument