(defconst tool-bar-keymap-cache (make-hash-table :weakness t :test 'equal))
-(defun tool-bar-make-keymap (&optional ignore)
+(defun tool-bar-make-keymap (&optional _ignore)
"Generate an actual keymap from `tool-bar-map'.
Its main job is to figure out which images to use based on the display's
color capability and based on the available image libraries."