diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d739d2e969d..156ae4e623a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2011-12-23  Tristan Gingold  <gingold@adacore.com>
+
+	* config/ia64/vms.h (SUPPORTS_ONE_ONLY): Define.
+
 2011-12-22  Bin Cheng  <bin.cheng@arm.com>
 	Richard Guenther  <rguenther@suse.de>
 
diff --git a/gcc/config/ia64/vms.h b/gcc/config/ia64/vms.h
index f34ee78465a..e847a0fc500 100644
--- a/gcc/config/ia64/vms.h
+++ b/gcc/config/ia64/vms.h
@@ -157,3 +157,7 @@ STATIC func_ptr __CTOR_LIST__[1]                                             \
 
 #undef TARGET_PROMOTE_FUNCTION_MODE
 #define TARGET_PROMOTE_FUNCTION_MODE default_promote_function_mode_always_promote
+
+/* IA64 VMS doesn't fully support COMDAT sections.  */
+
+#define SUPPORTS_ONE_ONLY 0