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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