It only checks for the ones starting with underscore. > This check does not (yet) check for other reserved names, e.g. macro names identical to language keywor

It only checks for the ones starting with underscore. > This check does not (yet) check for other reserved names, e.g. macro names identical to language keywords, and names specifically reserved by language standards, e.g. C++ ‘zombie names’ and C future library directions.