Revert "Prevent bootstrap autoload backup files"

This reverts commit c23c965bb9d0a4bcc1b6158833ff99aa20fd53e9.

1 files changed, 14 insertions, 28 deletions

diff --git a/lisp/emacs-lisp/autoload.el b/lisp/emacs-lisp/autoload.el
index 592d69d2eb9..e688d6be725 100644
--- a/lisp/emacs-lisp/autoload.el
+++ b/lisp/emacs-lisp/autoload.el
@@ -234,22 +234,9 @@ If a buffer is visiting the desired autoload file, return it."
         (enable-local-eval nil))
     ;; We used to use `raw-text' to read this file, but this causes
     ;; problems when the file contains non-ASCII characters.
-    (let* ((delay-mode-hooks t)
-           (file (autoload-generated-file))
-           (file-missing (not (file-exists-p file))))
-      (when file-missing
-        (autoload-ensure-default-file file))
-      (with-current-buffer
-          (find-file-noselect
-           (autoload-ensure-file-writeable
-            file))
-        ;; block backups when the file has just been created, since
-        ;; the backups will just be the auto-generated headers.
-        ;; bug#23203
-        (when file-missing
-          (setq buffer-backed-up t)
-          (save-buffer))
-        (current-buffer)))))
+    (let ((delay-mode-hooks t))
+      (find-file-noselect
+       (autoload-ensure-default-file (autoload-generated-file))))))
 
 (defun autoload-generated-file ()
   (expand-file-name generated-autoload-file
@@ -370,22 +357,21 @@ not be relied upon."
 ;;;###autoload
 (put 'autoload-ensure-writable 'risky-local-variable t)
 
-(defun autoload-ensure-file-writeable (file)
-  ;; Probably pointless, but replaces the old AUTOGEN_VCS in lisp/Makefile,
-  ;; which was designed to handle CVSREAD=1 and equivalent.
-  (and autoload-ensure-writable
-       (let ((modes (file-modes file)))
-         (if (zerop (logand modes #o0200))
-             ;; Ignore any errors here, and let subsequent attempts
-             ;; to write the file raise any real error.
-             (ignore-errors (set-file-modes file (logior modes #o0200))))))
-  file)
-
 (defun autoload-ensure-default-file (file)
   "Make sure that the autoload file FILE exists, creating it if needed.
 If the file already exists and `autoload-ensure-writable' is non-nil,
 make it writable."
-  (write-region (autoload-rubric file) nil file))
+  (if (file-exists-p file)
+      ;; Probably pointless, but replaces the old AUTOGEN_VCS in lisp/Makefile,
+      ;; which was designed to handle CVSREAD=1 and equivalent.
+      (and autoload-ensure-writable
+           (let ((modes (file-modes file)))
+             (if (zerop (logand modes #o0200))
+                 ;; Ignore any errors here, and let subsequent attempts
+                 ;; to write the file raise any real error.
+                 (ignore-errors (set-file-modes file (logior modes #o0200))))))
+    (write-region (autoload-rubric file) nil file))
+  file)
 
 (defun autoload-insert-section-header (outbuf autoloads load-name file time)
   "Insert the section-header line,