For PR java/4509:

	* parse.y (java_complete_lhs) [COMPOUND_EXPR]: Correctly compute
	CAN_COMPLETE_NORMALLY for the node.
	* jcf-write.c (generate_bytecode_insns) [COMPOUND_EXPR]: Don't
	generate code for second branch if first branch can't complete
	normally.
	(generate_bytecode_insns) [LOOP_EXPR]: Don't generate `goto' to
	the loop head if the loop body can't complete normally.

From-SVN: r48249

gcc/java/parse.y

@@ -5232,14 +5232,23 @@ check_inner_circular_reference (source, target)
 
   if (!basetype_vec)
     return NULL_TREE;
-  
+
   for (i = 0; i < TREE_VEC_LENGTH (basetype_vec); i++)
     {
-      tree su = BINFO_TYPE (TREE_VEC_ELT (basetype_vec, i));
+      tree su;
+
+      /* We can end up with a NULL_TREE or an incomplete type here if
+	 we are compiling multiple files at once.  It's safe to simply
+	 ignore these cases.  */
+      if (TREE_VEC_ELT (basetype_vec, i) == NULL_TREE)
+	continue;
+      su = BINFO_TYPE (TREE_VEC_ELT (basetype_vec, i));
+      if (INCOMPLETE_TYPE_P (su))
+	continue;
 
       if (inherits_from_p (su, target))
 	return lookup_cl (TYPE_NAME (su));
-      
+
       for (ctx = DECL_CONTEXT (TYPE_NAME (su)); ctx; ctx = DECL_CONTEXT (ctx))
 	{
 	  /* An enclosing context shouldn't be TARGET */