--- a/src/cpu/zero/vm/sharedRuntime_zero.cpp	Thu Oct 10 18:26:22 2013 +0200
+++ b/src/cpu/zero/vm/sharedRuntime_zero.cpp	Fri Oct 11 10:38:03 2013 +0200
@@ -89,6 +89,7 @@
                                                             ret_type);
 #else
   ShouldNotCallThis();
+  return NULL;
 #endif // SHARK
 }
 
@@ -99,6 +100,7 @@
 
 uint SharedRuntime::out_preserve_stack_slots() {
   ShouldNotCallThis();
+  return 0;
 }
 
 JRT_LEAF(void, zero_stub())
@@ -135,4 +137,5 @@
                                          VMRegPair *regs,
                                          int total_args_passed) {
   ShouldNotCallThis();
+  return 0;
 }