--- /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 Psr\Log\LoggerInterface;
+use Symfony\Component\HttpKernel\Log\Logger;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+/**
+ * Registers the default logger if necessary.
+ *
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+class LoggerPass implements CompilerPassInterface
+{
+ /**
+ * {@inheritdoc}
+ */
+ public function process(ContainerBuilder $container)
+ {
+ $container->setAlias(LoggerInterface::class, 'logger')
+ ->setPublic(false);
+
+ if ($container->has('logger')) {
+ return;
+ }
+
+ $container->register('logger', Logger::class)
+ ->setPublic(false);
+ }
+}