GNU bug report logs - #53014
27.2; `cl-macs.el' no longer provides `cl-macs'

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Glenn Morris <rgm <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#53014: closed (27.2; `cl-macs.el' no longer provides `cl-macs')
Date: Wed, 05 Jan 2022 01:30:02 +0000

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Your message dated Tue, 04 Jan 2022 20:28:58 -0500
with message-id <d04k6jt1gl.fsf <at> fencepost.gnu.org>
and subject line Re: bug#53014: 27.2; `cl-macs.el' no longer provides `cl-macs'
has caused the debbugs.gnu.org bug report #53014,
regarding 27.2; `cl-macs.el' no longer provides `cl-macs'
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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From: Drew Adams <drew.adams <at> oracle.com>
To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org>
Subject: 27.2; `cl-macs.el' no longer provides `cl-macs'
Date: Tue, 4 Jan 2022 21:14:08 +0000

Presumably a design bug, i.e., intentional.

Until Emacs 27, code could use this to load the macros defining things
like `cl-case' (which has  l o n g  been aliased to `case', and which
should even be in Emacs Lisp itself, as is `push'):

(eval-when-compile (require 'cl-macs))

Emacs 27 breaks that.  Now, if you need only CL macros, you need to
require `cl-lib.el' instead.  So any library that needs something like
`case', and needs to support both Emacs 27+ and older Emacs versions,
needs to jump through a hoop such as this (or another, using
`load-library'):

(eval-when-compile 
  (require (if (< emacs-major-version 27) 'cl-macs 'cl-lib)))

Gratuitous bother.  Or was there some real need for introducing the
incompatibility?

In GNU Emacs 27.2 (build 1, x86_64-w64-mingw32)
 of 2021-03-26 built on CIRROCUMULUS
Repository revision: deef5efafb70f4b171265b896505b92b6eef24e6
Repository branch: HEAD
Windowing system distributor 'Microsoft Corp.', version 10.0.19042
System Description: Microsoft Windows 10 Pro (v10.0.2009.19042.1348)

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From: Glenn Morris <rgm <at> gnu.org>
To: 53014-done <at> debbugs.gnu.org
Subject: Re: bug#53014: 27.2; `cl-macs.el' no longer provides `cl-macs'
Date: Tue, 04 Jan 2022 20:28:58 -0500

There are several misconceptions in this report.

cl-macs.el continues to provide cl-macs, as it always has done.

Loading internal sub-components of cl-lib has always been discouraged.

The way to use cl-lib continues to be to (require 'cl-lib).
Code needing only macros can add eval-when-compile to that.
This is documented in the usage node of the cl manual.

(This was explained 6 years ago in bug#22291.)

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