Allow ignoring files during byte compilation

* bytecomp.el (byte-compile-ignore-files): Add new variable.
(byte-recompile-directory): Respect 'byte-compile-ignore-files'.

1 files changed, 14 insertions, 2 deletions

diff --git a/lisp/emacs-lisp/bytecomp.el b/lisp/emacs-lisp/bytecomp.el
index 1ecd77f7517..b0ace9dae6a 100644
--- a/lisp/emacs-lisp/bytecomp.el
+++ b/lisp/emacs-lisp/bytecomp.el
@@ -1876,6 +1876,9 @@ Files in subdirectories of DIRECTORY are processed also."
   (interactive "DByte force recompile (directory): ")
   (byte-recompile-directory directory nil t))
 
+(defvar byte-compile-ignore-files nil
+  "List of regexps for files to ignore during byte compilation.")
+
 ;;;###autoload
 (defun byte-recompile-directory (directory &optional arg force follow-symlinks)
   "Recompile every `.el' file in DIRECTORY that needs recompilation.
@@ -1932,14 +1935,23 @@ also be compiled."
                       ;; This file is a subdirectory.  Handle them differently.
                       (or (null arg) (eq 0 arg)
                           (y-or-n-p (concat "Check " source "? ")))
-                      (setq directories (nconc directories (list source))))
+                      (setq directories (nconc directories (list source)))
+                      ;; Directory is requested to be ignored
+                      (string-match-p
+                       (regexp-opt byte-compile-ignore-files)
+                       source)
+                      (setq directories (nconc directories (list source))))
                ;; It is an ordinary file.  Decide whether to compile it.
                (if (and (string-match emacs-lisp-file-regexp source)
                         ;; The next 2 tests avoid compiling lock files
                         (file-readable-p source)
                         (not (string-match "\\`\\.#" file))
                         (not (auto-save-file-name-p source))
-                        (not (member source (dir-locals--all-files directory))))
+                        (not (member source (dir-locals--all-files directory)))
+                        ;; File is requested to be ignored
+                        (string-match-p
+                         (regexp-opt byte-compile-ignore-files)
+                         source))
                    (progn (cl-incf
                            (pcase (byte-recompile-file source force arg)
                              ('no-byte-compile skip-count)