dir-locals: apply our C settings in C++ also

This also works with Emacs 30 Tree-Sitter C and C++ modes, as they are
submodes.

ChangeLog:

	* .dir-locals.el: Change c-mode to a list of C, C++ and ObjC
	modes that Emacs currently provides.

diff --git a/.dir-locals.el b/.dir-locals.el
index fa031cbded9909889dbe4442182a8ae9721b6c29..2c12b3866633b08f190a223bedf5b15f4c0af6e6 100644 (file)
--- a/.dir-locals.el
+++ b/.dir-locals.el
@@ -18,6 +18,10 @@
              (tcl-continued-indent-level . 4)
              (indent-tabs-mode . t)))
  (nil . ((bug-reference-url-format . "https://gcc.gnu.org/PR%s")))
+ ;; Please keep C and C++ in sync.
  (c-mode . ((c-file-style . "GNU")
            (indent-tabs-mode . t)
-           (fill-column . 79))))
+           (fill-column . 79)))
+ (c++-mode . ((c-file-style . "GNU")
+             (indent-tabs-mode . t)
+             (fill-column . 79))))