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-rw-r--r--lisp/emacs-lisp/bytecomp.el4
1 files changed, 3 insertions, 1 deletions
diff --git a/lisp/emacs-lisp/bytecomp.el b/lisp/emacs-lisp/bytecomp.el
index 65ccb60726f..d093d95a775 100644
--- 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)