only output a warning in timer debug mode

Author: withinboredom

Zend/zend_max_execution_timer.c

@@ -45,8 +45,9 @@ ZEND_API void zend_max_execution_timer_init(void) /* {{{ */
 
 	// Now check to see if a we've already set a signal handler
 	if(is_handler_set) {
-		// emit a warning and return
-		zend_error(E_WARNING, "A max execution timer was already configured and will not be configured again.");
+#  ifdef MAX_EXECUTION_TIMERS_DEBUG
+		fprintf(stderr, "A max execution timer was already configured and will not be configured again on thread %d\n", sev.sigev_notify_thread_id);
+#  endif
 		return;
 	}