Make update-file-autoloads respect generated-autoload-file

* lisp/emacs-lisp/autoload.el (update-file-autoloads): Make
update-file-autoloads respect `generated-autoload-file', as
documented.

diff --git a/lisp/emacs-lisp/autoload.el b/lisp/emacs-lisp/autoload.el
index e6e3fd9da105c08fec536b0a59df110f17f26155..07bda537b39bd7f99b471d22fa10a90375afa8dd 100644 (file)
--- a/lisp/emacs-lisp/autoload.el
+++ b/lisp/emacs-lisp/autoload.el
@@ -923,6 +923,7 @@ Return FILE if there was no autoload cookie in it, else nil."
   (interactive (list (read-file-name "Update autoloads for file: ")
                     current-prefix-arg
                     (read-file-name "Write autoload definitions to file: ")))
+  (setq outfile (or outfile generated-autoload-file))
   (let* ((autoload-modified-buffers nil)
         ;; We need this only if the output file handles more than one input.
         ;; See https://debbugs.gnu.org/22213#38 and subsequent.