From 697ef44e1ce78e5c93ddb76252da95816d7429cd Mon Sep 17 00:00:00 2001
From: Christopher Kohlhoff <chris@kohlhoff.com>
Date: Sat, 2 Feb 2008 12:02:23 +0000
Subject: [PATCH] The latest Windows SDKs don't support IPv6 when building for
 Windows 2000, so we need to use the SDK emulation in that case.

[SVN r43056]
---
 include/boost/asio/detail/old_win_sdk_compat.hpp | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/include/boost/asio/detail/old_win_sdk_compat.hpp b/include/boost/asio/detail/old_win_sdk_compat.hpp
index 1daacacc..707177bb 100644
--- a/include/boost/asio/detail/old_win_sdk_compat.hpp
+++ b/include/boost/asio/detail/old_win_sdk_compat.hpp
@@ -31,6 +31,10 @@
 #if defined(BOOST_ASIO_HAS_OLD_WIN_SDK)
 
 // Emulation of types that are missing from old Platform SDKs.
+//
+// N.B. this emulation is also used if building for a Windows 2000 target with
+// a recent (i.e. Vista or later) SDK, as the SDK does not provide IPv6 support
+// in that case.
 
 namespace boost {
 namespace asio {
@@ -55,9 +59,19 @@ struct sockaddr_storage_emulation
 
 struct in6_addr_emulation
 {
-  u_char s6_addr[16];
+  union
+  {
+    u_char Byte[16];
+    u_short Word[8];
+  } u;
 };
 
+#if !defined(s6_addr)
+# define _S6_un u
+# define _S6_u8 Byte
+# define s6_addr _S6_un._S6_u8
+#endif // !defined(s6_addr)
+
 struct sockaddr_in6_emulation
 {
   short sin6_family;