[PATCH:libxtrans 2/2] Check if we need to define _XOPEN_SOURCE for struct msghdr.msg_control

[Alan Coopersmith]

Required to expose the structure members in Solaris headers, since it
was an XPG4/UNIX95 addition to the Solaris ABI.

Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>
---
 xtrans.m4 |   33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/xtrans.m4 b/xtrans.m4
index 91c6f9d..aa91a1c 100644
--- a/xtrans.m4
+++ b/xtrans.m4
@@ -57,6 +57,39 @@ AC_DEFUN([XTRANS_TCP_FLAGS],[
 AC_INCLUDES_DEFAULT
 #include <sys/socket.h>])
 
+ # XPG4v2/UNIX95 added msg_control - check to see if we need to define
+ # _XOPEN_SOURCE to get it (such as on Solaris)
+ AC_CHECK_MEMBER([struct msghdr.msg_control], [], [],
+                 [
+AC_INCLUDES_DEFAULT
+#include <sys/socket.h>
+                 ])
+ # First try for Solaris in C99 compliant mode, which requires XPG6/UNIX03
+ if test "x$ac_cv_member_struct_msghdr_msg_control" = xno; then
+     unset ac_cv_member_struct_msghdr_msg_control
+     AC_CHECK_MEMBER([struct msghdr.msg_control],
+                     [AC_DEFINE([_XOPEN_SOURCE], [600],
+                       [Defined if needed to expose struct msghdr.msg_control])
+                     ], [], [
+#define _XOPEN_SOURCE 600
+AC_INCLUDES_DEFAULT
+#include <sys/socket.h>
+                     ])
+ fi
+ # If that didn't work, fall back to XPG5/UNIX98 with C89
+ if test "x$ac_cv_member_struct_msghdr_msg_control" = xno; then
+     unset ac_cv_member_struct_msghdr_msg_control
+     AC_CHECK_MEMBER([struct msghdr.msg_control],
+                     [AC_DEFINE([_XOPEN_SOURCE], [500],
+                       [Defined if needed to expose struct msghdr.msg_control])
+                     ], [], [
+#define _XOPEN_SOURCE 500
+AC_INCLUDES_DEFAULT
+#include <sys/socket.h>
+                     ])
+ fi
+
+
 ]) # XTRANS_TCP_FLAGS
 
 # XTRANS_CONNECTION_FLAGS()
-- 
1.7.9.2