The test case has an enumeration type with no enumerators. This is not legal in C, but in C++, it is legal to have no enumerators, in which case [C++98 7.2 "Enumeration declarations" p5] "If the enumerator list is empty, the underlying type is as if the enumeration had a single enumerator with value 0." In other words, the enum is a complete type with non-zero size. However, the compiler mistakenly thinks that this enum is incomplete, so it does not emit a DW_AT_byte_size attribute in the DWARF information for the enumeration type. This lack causes CCS to crash when attempting to display a variable declared with that enumeration type.