Fix bug 6467:

runtime/bin/main.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_debugger_api.h"
@@ skipping 611 matching lines @@
 
 
 static const int kErrorExitCode = 255;  // Indicates we encountered an error.
 
 
 static int ErrorExit(const char* format, ...) {
   va_list arguments;
   va_start(arguments, format);
   Log::VPrintErr(format, arguments);
   va_end(arguments);
+  fflush(stderr);
 
   Dart_ExitScope();
   Dart_ShutdownIsolate();
 
   return kErrorExitCode;
 }
 
 
 static void ShutdownIsolate(void* callback_data) {
   IsolateData* isolate_data = reinterpret_cast<IsolateData*>(callback_data);
@@ skipping 43 matching lines @@
       return kErrorExitCode;
     }
   }
 
   Dart_SetVMFlags(vm_options.count(), vm_options.arguments());
 
   // Initialize the Dart VM.
   if (!Dart_Initialize(CreateIsolateAndSetup,
                        NULL,
                        ShutdownIsolate)) {
-    return ErrorExit("VM initialization failed\n");
+    fprintf(stderr, "%s", "VM initialization failed\n");
+    fflush(stderr);
+    return kErrorExitCode;
   }
 
   DartUtils::SetOriginalWorkingDirectory();
 
   // Start the debugger wire protocol handler if necessary.
   if (start_debugger) {
     ASSERT(debug_port != 0);
     DebuggerConnectionHandler::StartHandler(debug_ip, debug_port);
   }
 
@@ skipping 65 matching lines @@
   Dart_ShutdownIsolate();
   // Terminate process exit-code handler.
   Process::TerminateExitCodeHandler();
   // Free copied argument strings if converted.
   if (argv_converted) {
     for (int i = 0; i < argc; i++) free(argv[i]);
   }
 
   return 0;
 }