In your previous mail you wrote:
   
   >=> if in6_addr is defined as four 32 bit integers then the compiler
   >won't add padding. If it is defined as a pair of 64 bit integers the
   >compiler may add 32 bits for padding if the MTU field is before and
   >the architecture needs 64 bit alignment for 64 bit quantities.
   
        well, i'd like to know how far do we need to go.  think of binary
        compatibility with 32/64/128/256bit CPUs, i believe we cannot do
        much here anyways.
   
=> no, my concern is binary compatibility for the same 32 bit CPU with
two different definitions of struct in6_addr.

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