>>>>> "Jan" == Jan Engelhardt <jengelh@xxxxxxxxxx> writes:
Hi,
Jan> On Friday 2011-07-22 07:24, Peter Korsgaard wrote:
>> ea2a02f7 (libxt_TCPMSS: use guided option parser) added an netinet/ip6.h
>> include, which is not available on systems without ipv6.
Jan> I can understand that some implementations omit symbols that are a
Jan> runtime dependency (such as in6addr_any) from the library, but structs
Jan> are for free, so what broken libc does forget those?
uClibc. It doesn't even install netinet/{ip6,icmp6}.h if ipv6 support
isn't enabled:
http://git.uclibc.org/uClibc/tree/Makefile.in#n249
>> +#define IPHDRSIZE 20 /* sizeof(struct iphdr) */
>> +#define IP6HDRSIZE 40 /* sizeof(struct ip6_hdr) */
Jan> That would put a hard assumption on the implementation, which does
Jan> not seem the right thing to do.
But those structs define the network format of ipv4 and ipv6 headers, so
they are not likely to change.
--
Bye, Peter Korsgaard
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