C.1.9 Structures, Unions, Enumerations, and Bit-fields (J.3.9)

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

  It is treated as an unsigned int.

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

  A bit field can be declared as any integer type.

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

  Bit-fields do not straddle storage-unit boundaries.

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

  Bit-fields are allocated within a storage unit from high-order to low-order.

• 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).

  This is an int.