-qenum

In IBM® XL C/C++ for AIX® 16.1.0 or earlier releases, the -qenum option specifies the amount of storage occupied by enumerations.

In IBM Open XL C/C++ for AIX 17.1.3, use -fshort-enums as a functionally equivalent option to -qenum=small. Other -qenum suboptions are not supported. For C++ programs, you can also use the C++11 scoped enumeration feature to specify the underlying type of enumerations.

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