Fix domctl GCC dependency

Compilers other than GCC don't allow zero-sized structs.

Signed-off-by: John Levon <john.levon@sun.com>

diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index 5d9a44c3ee8a3c4763ed63ffd78dbfb42a4cbcb9..dbd25ce293479115c79fd6bcaefa2dd81364569b 100644 (file)
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -544,8 +544,11 @@ DEFINE_XEN_GUEST_HANDLE(xen_domctl_ext_vcpucontext_t);
  */
 #define XEN_DOMCTL_set_opt_feature    44
 struct xen_domctl_set_opt_feature {
-#ifdef __ia64__
+#if defined(__ia64__)
     struct xen_ia64_opt_feature optf;
+#else
+    /* Make struct non-empty: do not depend on this field name! */
+    uint64_t dummy;
 #endif
 };
 typedef struct xen_domctl_set_opt_feature xen_domctl_set_opt_feature_t;