[lwip-users] [lwip] Porting issues

[Atanas Korchev]

Hi.
I recently started to port lwIP. My compiler cannot align nested structures at 
even boundary. That of course means that assignment as 
struct tcp_hdr* hdr = (struct tcp_hdr*)p->payload;
would not do their job at all. My first idea was to make some procedures like 
ip_hdr_from_mem,ip_hdr_to_mem and fill structure elements. This technique 
helped when porting IP and ICMP layers. But I really got stuck when I began 
porting TCP. I used the same technique and it almost helped - connect and 
receive works almost fine but transmit is no good. Can anyone think out a 
workaround of my compiler limitation. (I'm sure that there isn't any hidden 
option that turns this feature on:)

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