V8_Fatal now prints C++ stack trace in debug mode.

src/platform-nullos.cc

 // Copyright 2012 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 259 matching lines @@
   // Minimalistic implementation for bootstrapping.
   abort();
 }
 
 
 void OS::DebugBreak() {
   UNIMPLEMENTED();
 }
 
 
+void OS::DumpBacktrace() {
+  // Currently unsupported.
+}
+
+
 OS::MemoryMappedFile* OS::MemoryMappedFile::open(const char* name) {
   UNIMPLEMENTED();
   return NULL;
 }
 
 
 OS::MemoryMappedFile* OS::MemoryMappedFile::create(const char* name, int size,
     void* initial) {
   UNIMPLEMENTED();
   return NULL;
@@ skipping 218 matching lines @@
   UNIMPLEMENTED();
 }
 
 
 void ProfileSampler::Stop() {
   UNIMPLEMENTED();
 }
 
 
 } }  // namespace v8::internal