Re: Emacs version compatibility

[Michael Albinus <michael.albinus@gmx.de>]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> But I was thinking that (as with gnulib), projects would just copy stuff
> from the compat library at will as they need it, instead of having to
> include the entire shebang.  And they'd include different bits of it,
> according to what Emacs versions they attempt supporting.

Sure. First step into this direction could be a modularization of that
compat library into compat22.el, compat23.el, xcompat.el.

compat22.el would include compatibility functions needed in Emacs 22 and
introduced in Emacs 23, and compat23.el would include those from Emacs
24 aso. In Gnus, you could do

(if (featurep 'xemacs)
    (require 'xcompat)
  (require 'compat23))

In Tramp, I would also require compat22.el (as long as I'm not bored of
Emacs 22 support).

And there is a relation between fsf-compat.el from XEmacs, and
xcompat.el.

Best regards, Michael.