symfony
diff --git a/‎src/Symfony/Bundle/FrameworkBundle/Resources/config/services.xml
Copy file name to clipboardExpand all lines: src/Symfony/Bundle/FrameworkBundle/Resources/config/services.xml
+2Lines changed: 2 additions & 0 deletions b/‎src/Symfony/Bundle/FrameworkBundle/Resources/config/services.xml
Copy file name to clipboardExpand all lines: src/Symfony/Bundle/FrameworkBundle/Resources/config/services.xml
+2Lines changed: 2 additions & 0 deletions
diff --git a/‎src/Symfony/Component/HttpKernel/CacheWarmer/CacheWarmerAggregate.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/HttpKernel/CacheWarmer/CacheWarmerAggregate.php
+49-1Lines changed: 49 additions & 1 deletion b/‎src/Symfony/Component/HttpKernel/CacheWarmer/CacheWarmerAggregate.php
Copy file name to clipboardExpand all lines: src/Symfony/Component/HttpKernel/CacheWarmer/CacheWarmerAggregate.php
+49-1Lines changed: 49 additions & 1 deletion
@@ -32,6 +32,8 @@
 
         <service id="cache_warmer" class="Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerAggregate" public="true">
             <argument type="tagged" tag="kernel.cache_warmer" />
+            <argument>%kernel.debug%</argument>
+            <argument>%kernel.cache_dir%/%kernel.container_class%</argument>
         </service>
 
         <service id="cache_clearer" class="Symfony\Component\HttpKernel\CacheClearer\ChainCacheClearer" public="true">
 
@@ -21,12 +21,16 @@
 class CacheWarmerAggregate implements CacheWarmerInterface
 {
     private $warmers;
+    private $debug;
+    private $containerPathPrefix;
     private $optionalsEnabled = false;
     private $onlyOptionalsEnabled = false;
 
-    public function __construct(iterable $warmers = array())
+    public function __construct(iterable $warmers = array(), bool $debug = false, string $containerPathPrefix = null)
     {
         $this->warmers = $warmers;
+        $this->debug = $debug;
+        $this->containerPathPrefix = $containerPathPrefix;
     }
 
     public function enableOptionalWarmers()
@@ -46,6 +50,40 @@ public function enableOnlyOptionalWarmers()
      */
     public function warmUp($cacheDir)
     {
+        if ($this->debug) {
+            $collectedLogs = array();
+            $previousHandler = defined('PHPUNIT_COMPOSER_INSTALL');
+            $previousHandler = $previousHandler ?: set_error_handler(function ($type, $message, $file, $line) use (&$collectedLogs, &$previousHandler) {
+                if (E_USER_DEPRECATED !== $type && E_DEPRECATED !== $type) {
+                    return $previousHandler ? $previousHandler($type, $message, $file, $line) : false;
+                }
+
+                if (isset($collectedLogs[$message])) {
+                    ++$collectedLogs[$message]['count'];
+
+                    return;
+                }
+
+                $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3);
+                // Clean the trace by removing first frames added by the error handler itself.
+                for ($i = 0; isset($backtrace[$i]); ++$i) {
+                    if (isset($backtrace[$i]['file'], $backtrace[$i]['line']) && $backtrace[$i]['line'] === $line && $backtrace[$i]['file'] === $file) {
+                        $backtrace = array_slice($backtrace, 1 + $i);
+                        break;
+                    }
+                }
+
+                $collectedLogs[$message] = array(
+                    'type' => $type,
+                    'message' => $message,
+                    'file' => $file,
+                    'line' => $line,
+                    'trace' => $backtrace,
+                    'count' => 1,
+                );
+            });
+        }
+
         foreach ($this->warmers as $warmer) {
             if (!$this->optionalsEnabled && $warmer->isOptional()) {
                 continue;
@@ -56,6 +94,16 @@ public function warmUp($cacheDir)
 
             $warmer->warmUp($cacheDir);
         }
+
+        if ($this->debug && true !== $previousHandler) {
+            if (null !== $this->containerPathPrefix && file_exists($file = $this->containerPathPrefix.'Deprecations.log')) {
+                $previousLogs = unserialize(file_get_contents($file));
+                $deprecatedLogs = array_merge($previousLogs, $collectedLogs);
+                file_put_contents($this->containerPathPrefix.'Deprecations.log', serialize(array_values($deprecatedLogs)));
+            }
+
+            restore_error_handler();
+        }
     }
 
     /**