For GCC10, check __cplusplus >= 201709 for c++20 support #282
gcc-c++20.yml
on: pull_request
Matrix: GCC C++20 Linux - No STL - Force C++03
Matrix: GCC C++20 Linux - No STL
Matrix: GCC C++20 Linux - STL - Force C++03
Matrix: GCC C++20 Linux - STL
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