DebugBreak shouldn't be used when ENABLE_DEBUGGER_SUPPORT isn't defined.

src/heap.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1480 matching lines @@
 
 
 #if V8_TARGET_ARCH_ARM && V8_NATIVE_REGEXP
 void Heap::CreateRegExpCEntryStub() {
   RegExpCEntryStub stub;
   set_re_c_entry_code(*stub.GetCode());
 }
 #endif
 
 
+#ifdef ENABLE_DEBUGGER_SUPPORT
 void Heap::CreateCEntryDebugBreakStub() {
   DebugerStatementStub stub;
   set_c_entry_debug_break_code(*stub.GetCode());
 }
+#endif
 
 
 void Heap::CreateJSEntryStub() {
   JSEntryStub stub;
   set_js_entry_code(*stub.GetCode());
 }
 
 
 void Heap::CreateJSConstructEntryStub() {
   JSConstructEntryStub stub;
   set_js_construct_entry_code(*stub.GetCode());
 }
 
 
 void Heap::CreateFixedStubs() {
   // Here we create roots for fixed stubs. They are needed at GC
   // for cooking and uncooking (check out frames.cc).
   // The eliminates the need for doing dictionary lookup in the
   // stub cache for these stubs.
   HandleScope scope;
   // gcc-4.4 has problem generating correct code of following snippet:
   // {  CEntryStub stub;
   //    c_entry_code_ = *stub.GetCode();
   // }
   // {  DebugerStatementStub stub;
   //    c_entry_debug_break_code_ = *stub.GetCode();
   // }
   // To workaround the problem, make separate functions without inlining.
   Heap::CreateCEntryStub();
+#ifdef ENABLE_DEBUGGER_SUPPORT
   Heap::CreateCEntryDebugBreakStub();
+#endif
   Heap::CreateJSEntryStub();
   Heap::CreateJSConstructEntryStub();
 #if V8_TARGET_ARCH_ARM && V8_NATIVE_REGEXP
   Heap::CreateRegExpCEntryStub();
 #endif
 }
 
 
 bool Heap::CreateInitialObjects() {
   Object* obj;
@@ skipping 2677 matching lines @@
 void ExternalStringTable::TearDown() {
   new_space_strings_.Free();
   old_space_strings_.Free();
 }
 
 
 List<Object*> ExternalStringTable::new_space_strings_;
 List<Object*> ExternalStringTable::old_space_strings_;
 
 } }  // namespace v8::internal