cperl-mode: Workaround for failure of cperl-write-tags

* lisp/progmodes/cperl-mode.el (cperl-mode): Accomodate recent
changes in etags (bug#42356).

diff --git a/lisp/progmodes/cperl-mode.el b/lisp/progmodes/cperl-mode.el
index cdbb59a5adddd5933ea725babccd8c171f73a588..6755d10f1abf4f269b5c1b215725a0ada4eccb7d 100644 (file)
--- a/lisp/progmodes/cperl-mode.el
+++ b/lisp/progmodes/cperl-mode.el
@@ -6786,6 +6786,7 @@ Use as
   (or topdir
       (setq topdir default-directory))
   (let ((tags-file-name "TAGS")
+        (inhibit-read-only t)
        (case-fold-search nil)
        xs rel)
     (save-excursion