-/* Determine the alignment of a structure slot (field) of a given type,
- at compile time. Note that the result depends on the ABI. */
+/* alignof_slot (TYPE)
+ Determine the alignment of a structure slot (field) of a given type,
+ at compile time. Note that the result depends on the ABI.
+ This is the same as alignof (TYPE) and _Alignof (TYPE), defined in
+ <stdalign.h> if __alignof_is_defined is 1.
+ Note: The result cannot be used as a value for an 'enum' constant,
+ due to bugs in HP-UX 10.20 cc and AIX 3.2.5 xlc. */