Fix handling of 'byte-compile-ignore-files' when nil

Before this fix, when 'byte-compile-ignore-files' was nil,
'byte-recompile-directory' would ignore every file (bug#64985).

* lisp/emacs-lisp/bytecomp.el (byte-recompile-directory): Handle case
when 'byte-compile-ignore-files' is nil.

diff --git a/lisp/emacs-lisp/bytecomp.el b/lisp/emacs-lisp/bytecomp.el
index 65ccb60726f286497e057742f26c653ddf032f25..d093d95a7752e90cd799faed890210ad05cc9768 100644 (file)
--- a/lisp/emacs-lisp/bytecomp.el
+++ b/lisp/emacs-lisp/bytecomp.el
@@ -1923,7 +1923,9 @@ also be compiled."
     (let ((directories (list default-directory))
          (default-directory default-directory)
           (ignore-files-regexp
-           (mapconcat #'identity byte-compile-ignore-files "\\|"))
+           (if byte-compile-ignore-files
+               (mapconcat #'identity byte-compile-ignore-files "\\|")
+             regexp-unmatchable))
          (skip-count 0)
          (fail-count 0)
          (file-count 0)