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Add Emacs 27 compatibility hack

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* lisp/progmodes/xref.el: Add Emacs 27 compatibility hack, for the
standalone version of this package.
This commit is contained in:
Dmitry Gutov 2021-10-08 05:23:19 +03:00
parent 89d64fca75
commit 9d8202b45e
1 changed files with 14 additions and 0 deletions
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14
lisp/progmodes/xref.el
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@ -74,6 +74,20 @@
(require 'ring) (require 'ring)
(require 'project) (require 'project)
(eval-and-compile
(when (version< emacs-version "28")
;; etags.el in Emacs 26 and 27 uses EIEIO, and its location type
;; inherits from `xref-location'.
(require 'eieio)
;; Suppressing byte-compilation warnings (in Emacs 28+) about
;; `defclass' not being defined, which happens because the
;; `require' statement above is not evaluated either.
;; FIXME: Use `with-suppressed-warnings' when we stop supporting Emacs 26.
(with-no-warnings
(defclass xref-location () ()
:documentation "(Obsolete) location represents a position in a file or buffer."))))
(defgroup xref nil "Cross-referencing commands." (defgroup xref nil "Cross-referencing commands."
:version "25.1" :version "25.1"
:group 'tools) :group 'tools)