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--enum_is_int
Forces the size of all enumeration types to be at least four bytes.
Note
ARM does not recommend the --enum_is_int option for general use.
Default
This option is switched off by default. The smallest
data type that can hold the values of all enumerators is used. However, if you specify an
ARM Linux configuration file on the command line, --enum_is_int is switched on by default.