* debug.h (being_debugged): New macro.

* dtable.cc (dtable::extend): Use new macro.
* exceptions.cc (try_to_debug): Ditto.
* strace.cc (strace::hello): Only output debugging info when we think we're
being debugged.

winsup/cygwin/exceptions.cc

@@ -393,7 +393,7 @@ try_to_debug (bool waitloop)
       if (!waitloop)
 	return 1;
       SetThreadPriority (hMainThread, THREAD_PRIORITY_IDLE);
-      while (!IsDebuggerPresent ())
+      while (!being_debugged ())
 	/* spin */;
       Sleep (4000);
       small_printf ("*** continuing from debugger call\n");