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doc: fix the compile fix of txtimestamp.c 

A fix to ipv6 structure definitions removed the now superfluous
definition of in6_pktinfo in this file.

But, use of the glibc definition requires defining _GNU_SOURCE
(see also https://sourceware.org/bugzilla/show_bug.cgi?id=6775).

Before this change, the following would fail for me:

  make
  make headers_install
  make M=Documentation/networking/timestamping

with

  Documentation/networking/timestamping/txtimestamp.c: In function '__recv_errmsg_cmsg':
  Documentation/networking/timestamping/txtimestamp.c:205:33: error: dereferencing pointer to incomplete type
  Documentation/networking/timestamping/txtimestamp.c:206:23: error: dereferencing pointer to incomplete type

After this patch compilation succeeded.

Fixes: cd91cc5bdd ("doc: fix the compile error of txtimestamp.c")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Willem de Bruijn 2015-01-10 12:08:18 -05:00 committed by David S. Miller
parent ef5ba4aff9
commit d3b4b26173
1 changed files with 2 additions and 0 deletions
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Documentation/networking/timestamping/txtimestamp.c
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@ -30,6 +30,8 @@
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define _GNU_SOURCE
#include <arpa/inet.h>
#include <asm/types.h>
#include <error.h>