- Determine whether the simulator is being used in globals.h

runtime/vm/os_win.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 "vm/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "vm/os.h"
 
 #include <malloc.h>  // NOLINT
@@ skipping 168 matching lines @@
   }
   OS::Sleep(micros / kMicrosecondsPerMillisecond);
 }
 
 
 void OS::DebugBreak() {
 #if defined(_MSC_VER)
   // Microsoft Visual C/C++ or drop-in replacement.
   __debugbreak();
 #elif defined(__GCC__)
-  // MinGW?
-  asm("int $3");
+  __builtin_trap();
 #else
   // Microsoft style assembly.
   __asm {
     int 3
   }
 #endif
 }
 
 
 char* OS::StrNDup(const char* s, intptr_t n) {
@@ skipping 128 matching lines @@
 }
 
 
 void OS::Exit(int code) {
   exit(code);
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)