From: Dmitry Gutov <dgutov@yandex.ru>
To: emacs-devel@gnu.org
Subject: eval-when-compile help?
Date: Tue, 5 Oct 2021 06:01:43 +0300 [thread overview]
Message-ID: <8e532f35-729d-ed5a-c4f4-85e2d011c8eb@yandex.ru> (raw)
Hi all,
I need to add a piece of code to xref.el which will make it load eieio
and define a class xref-location when [possibly byte-compiled and]
loaded in Emacs 27 or older.
But preferably avoid loading EIEIO in Emacs 28+. Both at runtime when
xref.el is loaded, and when it's compiled too.
The current patch is below. Am I overdoing it with 'eval-and-compile'?
diff --git a/lisp/progmodes/xref.el b/lisp/progmodes/xref.el
index 1feb6ef915..c9334cfa04 100644
--- a/lisp/progmodes/xref.el
+++ b/lisp/progmodes/xref.el
@@ -74,6 +74,13 @@
(require 'ring)
(require 'project)
+(when (version< emacs-version "28")
+ (eval-and-compile
+ (require 'eieio)
+
+ (defclass xref-location () ()
+ :documentation "(Obsolete) location represents a position in a
file or buffer.")))
+
(defgroup xref nil "Cross-referencing commands."
:version "25.1"
:group 'tools)
next reply other threads:[~2021-10-05 3:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-05 3:01 Dmitry Gutov [this message]
2021-10-05 12:19 ` eval-when-compile help? Stefan Monnier
2021-10-05 14:16 ` Dmitry Gutov
2021-10-05 15:05 ` Stefan Monnier
2021-10-05 16:22 ` Dmitry Gutov
2021-10-05 19:53 ` Stefan Monnier
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