J.3.9 Structures, unions, enumerations, and bit-fields

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• Whether a “plain” int bit-field is treated as a signed int bit-field or as an unsigned int bit-field (6.7.2, 6.7.2.1).

• Allowable bit-field types other than _Bool, signed int, and unsigned int (6.7.2.1).

• Whether a bit-field can straddle a storage-unit boundary (6.7.2.1).

• The order of allocation of bit-fields within a unit (6.7.2.1).

• The alignment of non-bit-field members of structures (6.7.2.1). This should present no problem unless binary data written by one implementation is read by another.

• The integer type compatible with each enumerated type (6.7.2.2).