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Re: [libvirt] OSX 10.6 build failures



On Tue, Sep 14, 2010 at 09:10:46PM -0500, Doug Goldstein wrote:
> On Tue, Sep 14, 2010 at 7:57 PM, Osier <jyang redhat com> wrote:
> >
> >>
> >> % man ipv6
> >>
> >>    Address Format
> >>            struct sockaddr_in6 {
> >>                sa_family_t     sin6_family;   /* AF_INET6 */
> >>                in_port_t       sin6_port;     /* port number */
> >>                uint32_t        sin6_flowinfo; /* IPv6 flow information
> >> */
> >>                struct in6_addr sin6_addr;     /* IPv6 address */
> >>                uint32_t        sin6_scope_id; /* Scope ID (new in 2.4)
> >> */
> >>            };
> >>
> >>            struct in6_addr {
> >>                unsigned char   s6_addr[16];   /* IPv6 address */
> >>            };
> >>

> 
> Yep. Just checked my OS X 10.6 box.. Here's the relevant snippet.
> 
> /*
>  * IPv6 address
>  */
> struct in6_addr {
>     union {
>         __uint8_t   __u6_addr8[16];
>         __uint16_t  __u6_addr16[8];
>         __uint32_t  __u6_addr32[4];
>     } __u6_addr;            /* 128-bit IP6 address */
> };
> 
> #define s6_addr   __u6_addr.__u6_addr8

The best thing about standards, is that there are so many to choose
from :-)  I just found this in cups/http.h ....

/*
 * Oh, the wonderful world of IPv6 compatibility.  Apparently some
 * implementations expose the (more logical) 32-bit address parts
 * to everyone, while others only expose it to kernel code...  To
 * make supporting IPv6 even easier, each vendor chose different
 * core structure and union names, so the same defines or code
 * can't be used on all platforms.
 *
 * The following will likely need tweaking on new platforms that
 * support IPv6 - the "s6_addr32" define maps to the 32-bit integer
 * array in the in6_addr union, which is named differently on various
 * platforms.
 */

#if defined(AF_INET6) && !defined(s6_addr32)
#  if defined(__sun)
#    define s6_addr32   _S6_un._S6_u32
#  elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__APPLE__)
#    define s6_addr32   __u6_addr.__u6_addr32
#  elif defined(__osf__)
#    define s6_addr32   s6_un.sa6_laddr
#  elif defined(WIN32)
/*
 * Windows only defines byte and 16-bit word members of the union and
 * requires special casing of all raw address code...
 */
#    define s6_addr32   error_need_win32_specific_code
#  endif /* __sun */
#endif /* AF_INET6 && !s6_addr32 */


I wonder if gnulib can help/save us here at all ?

Daniel
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