HS>    char bit0:1;
 FA> Firstly, bitfields have to be unsigned integers so 
 FA> change those declarations to unsigned bit0:1;

Um, not exactly.

        A bit-field shall have a type that is a qualified or unqualified
version of one of _int_, _unsigned int_, or _signed int_. (ANSI C 6.5.2.1,
underscored parts here are bold in original)



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