On Mon, May 02, 2011 at 12:07:30PM +0200, Alan T DeKok wrote:
> Josip Rodin wrote:
> > The first test works, but the second doesn't. The second one should actually
> > work, but the problem is in the definition:
>
> C compilers now have built-in "offsetof" to fix precisely this problem.
>
> See the attached patch. You'll have to re-run "autoconf" to
> re-generate the "configure" script.
Hrm, no luck:
configure:24780: checking for ipi6_addr in struct in6_pktinfo
configure:24813: gcc -c -g -O2 -O2 -D_REENTRANT -D_POSIX_PTHREAD_SEMANTICS
conftest.c >&5
conftest.c: In function 'main':
conftest.c:118: error: invalid use of undefined type 'struct in6_pktinfo'
configure:24819: $? = 1
configure: failed program was:
[...]
| #define HAVE_STDDEF_H 1
[...]
| #include <netinet/in.h>
| #ifdef HAVE_STDDEF_H
| #include <stddef.h>
| #endif
| #ifndef offsetof
| #define offsetof(TYPE, MEMBER) ((int) &((TYPE *)0)->MEMBER)
| #endif
|
| int
| main ()
| {
| int foo = offsetof(struct in6_pktinfo, ipi6_addr)
| ;
| return 0;
| }
configure:24840: result: no
It's definitely using the system offsetof(3), but it's not working.
It's like #include <netinet/in.h> did nothing...?!
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2. That which causes joy or happiness.
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