From 03a9915631857c596bd6de49352c76d0dc970429 Mon Sep 17 00:00:00 2001
From: Christophe Coevoet <stof@notk.org>
Date: Tue, 25 Sep 2018 10:35:44 +0200
Subject: [PATCH] Fix deprecation for symfony/config 4.2+

---
 DependencyInjection/Configuration.php | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/DependencyInjection/Configuration.php b/DependencyInjection/Configuration.php
index 102fcb6d5..07fa3194b 100644
--- a/DependencyInjection/Configuration.php
+++ b/DependencyInjection/Configuration.php
@@ -33,8 +33,14 @@ public function __construct($debug)
      */
     public function getConfigTreeBuilder()
     {
-        $treeBuilder = new TreeBuilder();
-        $rootNode    = $treeBuilder->root('doctrine');
+        $treeBuilder = new TreeBuilder('doctrine');
+
+        if (\method_exists($treeBuilder, 'getRootNode')) {
+            $rootNode = $treeBuilder->getRootNode();
+        } else {
+            // BC layer for symfony/config 4.1 and older
+            $rootNode = $treeBuilder->root('doctrine');
+        }
 
         $this->addDbalSection($rootNode);
         $this->addOrmSection($rootNode);