https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67314
--- Comment #2 from Chengnian Sun <chengniansun at gmail dot com> --- (In reply to Andrew Pinski from comment #1) > This warning is only useful for c++. C defines the full range of the > underlying type of the enum for the enum while c++ has different rules. > > Also I think this warning would be too noisy for c code and clang is wrong > to implement it for c. Thanks for your reply. So in C, if I understand correctly, the enum construct is mainly to define a set of integer constants. It is not like the enumerations in other languages, such as Java, to define a set of categorical values.
