Fix assert in build_va_arg, case 2b

2016-08-29  Tom de Vries  <tom@codesourcery.com>

	* c-common.c (build_va_arg): Fix type comparison assert.

From-SVN: r239829

gcc/c-family/ChangeLog

 2016-08-29  Tom de Vries  <tom@codesourcery.com>
 
+	* c-common.c (build_va_arg): Fix type comparison assert.
+
+2016-08-29  Tom de Vries  <tom@codesourcery.com>
+
 	* c-common.c (build_va_arg): Replace first argument type error
 	with assert.
 

gcc/c-family/c-common.c

@@ -5906,7 +5906,10 @@ build_va_arg (location_t loc, tree expr, tree type)
     {
       /* Case 2b: va_list is pointer to array elem type.  */
       gcc_assert (POINTER_TYPE_P (va_type));
-      gcc_assert (TREE_TYPE (va_type) == TREE_TYPE (canon_va_type));
+
+      /* Comparison as in std_canonical_va_list_type.  */
+      gcc_assert (TYPE_MAIN_VARIANT (TREE_TYPE (va_type))
+		  == TYPE_MAIN_VARIANT (TREE_TYPE (canon_va_type)));
 
       /* Don't take the address.  We've already got '&ap'.  */
       ;