--- /dev/null
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\DependencyInjection;
+
+use Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationPass as BaseMergeExtensionConfigurationPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+/**
+ * Ensures certain extensions are always loaded.
+ *
+ * @author Kris Wallsmith <kris@symfony.com>
+ */
+class MergeExtensionConfigurationPass extends BaseMergeExtensionConfigurationPass
+{
+ private $extensions;
+
+ public function __construct(array $extensions)
+ {
+ $this->extensions = $extensions;
+ }
+
+ public function process(ContainerBuilder $container)
+ {
+ foreach ($this->extensions as $extension) {
+ if (!count($container->getExtensionConfig($extension))) {
+ $container->loadFromExtension($extension, array());
+ }
+ }
+
+ parent::process($container);
+ }
+}