Fix sprockets logger

railties/lib/rails/engine.rb

@@ -463,7 +463,6 @@ def build_asset_environment
       require 'sprockets'
 
       env = Sprockets::Environment.new(root.to_s)
-      # env.logger = Rails.logger
       env.static_root = root.join("public")
 
       self.class.default_sprockets_paths.each do |pattern|
@@ -572,6 +571,10 @@ def load_seed
       # consistently executed after all the initializers above across all engines.
     end
 
+    initializer "sprockets.logger" do
+      assets.logger = Rails.logger
+    end
+
     rake_tasks do
       next if self.is_a?(Rails::Application)