[lwip-devel] [bug #27352] Change ip_addr from struct to typedef (u32_t)

[Simon Goldschmidt]

Follow-up Comment #3, bug #27352 (project lwip):

OK, that's definitively a fact I haven't been thinking about. That would also
be the reason the struct ip_addr is used as a pointer everywhere, not directly
as value.

However, we could still convert the IPv6 struct to

PACK_STRUCT_BEGIN
struct _ip_addr {
PACK_STRUCT_FIELD(u32_t addr[4]);
} ip_addr PACK_STRUCT_STRUCT;
PACK_STRUCT_END

That way it is used without 'struct', much the same way as 'typedef u32_t
ip_addr;'.

The IPv6 implementation must be changed anyway, so that v4 and v6 can be used
at the same time (e.g. renaming the struct/type to ip6_addr).

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