[Xen-changelog] Define __XEN_INTERFACE_VERSION__ when building Xen.

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID b524714dfb660e902bdab2fb6a241775b987296b
# Parent  60071beccf182e1f19e80c1a32af575d57fef1e2
Define __XEN_INTERFACE_VERSION__ when building Xen.

Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r 60071beccf18 -r b524714dfb66 xen/include/public/xen-compat.h
--- a/xen/include/public/xen-compat.h   Sat Apr  1 13:59:12 2006
+++ b/xen/include/public/xen-compat.h   Sun Apr  2 08:48:04 2006
@@ -9,8 +9,18 @@
 #ifndef __XEN_PUBLIC_XEN_COMPAT_H__
 #define __XEN_PUBLIC_XEN_COMPAT_H__
 
-#ifndef __XEN_INTERFACE_VERSION__
+#define __XEN_LATEST_INTERFACE_VERSION__ 0x00030101
+
+#if defined(__XEN__)
+/* Xen is built with matching headers and implements the latest interface. */
+#define __XEN_INTERFACE_VERSION__ __XEN_LATEST_INTERFACE_VERSION__
+#elif !defined(__XEN_INTERFACE_VERSION__)
+/* Guests which do not specify a version get the legacy interface. */
 #define __XEN_INTERFACE_VERSION__ 0x00000000
+#endif
+
+#if __XEN_INTERFACE_VERSION__ > __XEN_LATEST_INTERFACE_VERSION__
+#error "These header files do not support the requested interface version."
 #endif
 
 #if __XEN_INTERFACE_VERSION__ < 0x00030101

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