From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Leo Liu <sdl.web@gmail.com>
Cc: emacs-devel@gnu.org
Subject: Re: Has eval-and-compile changed in emacs 27?
Date: Thu, 25 Feb 2021 22:54:43 -0500 [thread overview]
Message-ID: <jwvlfbbeb9e.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <m15z2feelv.fsf@gmail.com> (Leo Liu's message of "Fri, 26 Feb 2021 10:40:12 +0800")
>> That one's easy: the way the warning works is that when we process
>> a `eval-when-compile` we look at the `load-history` to see the functions
>> that have been defined during execution of its body, and then we remember
>> those as "only available now but maybe not at runtime".
>>
>> If that loaded `cl-lib`, then a subsequent (require 'cl-lib) will be
>> a no-op and won't "unremember" the corresponding functions.
>
> This sounds like nightmare :(
>
> Is this new in Emacs 27?
No, it was new back when we added the "not known to exist at run-time",
i.e. a long time ago.
> What prompted the change?
We found it useful to try and warn the users when they did
(eval-when-compile (require FOO)) but FOO was also needed at run time.
Stefan
next prev parent reply other threads:[~2021-02-26 3:54 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-25 13:06 Has eval-and-compile changed in emacs 27? Leo Liu
2021-02-25 14:59 ` Eli Zaretskii
2021-02-25 15:06 ` Lars Ingebrigtsen
2021-02-25 15:23 ` Eli Zaretskii
2021-02-25 21:59 ` Leo Liu
2021-02-25 15:30 ` Basil L. Contovounesios
2021-02-25 16:18 ` Stefan Monnier
2021-02-25 16:28 ` Stefan Monnier
2021-02-25 21:55 ` Leo Liu
2021-02-25 22:29 ` Stefan Monnier
2021-02-26 2:40 ` Leo Liu
2021-02-26 3:54 ` Stefan Monnier [this message]
2021-02-26 8:40 ` Leo Liu
2021-02-26 9:21 ` Basil L. Contovounesios
2021-02-26 9:33 ` Basil L. Contovounesios
2021-02-26 12:06 ` Eli Zaretskii
2021-02-28 1:35 ` Leo Liu
2021-02-28 5:04 ` Stefan Monnier
2021-02-26 14:06 ` Stefan Monnier
2021-02-26 6:36 ` Richard Stallman
2021-02-26 7:54 ` Eli Zaretskii
2021-02-26 9:09 ` Basil L. Contovounesios
2021-02-27 0:34 ` Tomas Hlavaty
2021-02-27 7:16 ` Eli Zaretskii
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