[lwip-devel] [bug #48308] Warnings in PPP Van Jacobson code when compiling with clang

[Dirk Ziegelmeier]

Follow-up Comment #4, bug #48308 (project lwip):

Yes, clang does not warn about casting from u16_t* to struct xxx. It complains
about the first cast:

./../../../../lwip/src/netif/ppp/vj.c:165:28: error: cast from 'struct ip_hdr
' to 'u32_t ' (aka 'unsigned int *') increases required alignment from 1 to 4
[-Werror,-Wcast-align]
th = (struct tcp_hdr )&((u32_t)ip)[ilen]; 

in this case the variable ip is cast (a little bit indirectly) to an u32_t* by
&((u32_t)ip)

-> would be fixed by
th = (struct tcp_hdr )&((u8_t)ip)[ilen<<2]; 


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