Stop in cmake configure when the compiler is not supported
Summary
Closes #1964 (closed).
Throw an error in CMake instead of a warning when the compiler is not supported.
The fact that clang is not available by default on CentOS 7 and must be installed with devtoolset
Copyright
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git diff develop... -U0 --no-color | clang-format-diff.py -p1 -i
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