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bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping
From: |
Ihor Radchenko |
Subject: |
bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping Emacs |
Date: |
Thu, 26 Oct 2023 13:25:50 +0000 |
Eli Zaretskii <eliz@gnu.org> writes:
>> This is a surprise to me!
>> Is it documented anywhere?
>
> What do you want to document?
I think we misunderstand each other.
>> I thought that we should expect the value to
>> be evaluated unless explicitly wrapped into (eval-when-compile ...).
>
> At what time do you think defcustom's value is evaluated?
Load time, even for pdumped libraries.
>> Also, I just looked up defvar instances across Emacs and I am seeing
>> multiple cases when the value is calculated dynamically, assuming
>> loading time:
>
> Of course, it's loading time. But AFAIU you were talking about
> evaluation during dumping, i.e. when Emacs is built.
No. It is not what I am talking about.
In this bug report, I am talking about re-dumping the already built
Emacs with the aim of adding extra arbitrary libraries. According to
manual page for dump-emacs-portable,
If you want to use this function in an Emacs that was already
dumped, you must run Emacs with the ‘-batch’ option.
This implies that re-dumping is one of the intended use-cases.
> ... This is only
> relevant for defcustom's in packages that are preloaded, because those
> packages are loaded at build time, not at run time. So for those
> packages, and only for those packages, any defcustom whose default
> value is not a constant, should be re-evaluated at startup, to make
> sure the value is suitable for the system on which Emacs runs.
I can see your point, although I wish it were not so tricky.
In any case, even within a scope of this bug report, the reproducer I
provided does not load any extra packages. So, at least, there is some
bug with preloaded packages.
Maybe, the caveats with runtime/re-dump time evaluation should be
documented.
> ...
> This is not relevant, since packages that aren't preloaded will be
> loaded at run time, and therefore the values will be evaluated in the
> correct context. If you are talking about these, then I don't
> understand what prompted you to raise this issue to begin with, and in
> a thread that discusses dumping.
... but ideally, I wish that we would not have to patch the existing
libraries in order to preload them. Otherwise, `dump-emacs-portable'
function is not very useful in practice (except for building Emacs) and
will most likely lead to subtle bugs if attempted by users.
--
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>
- bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping Emacs, (continued)
- bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping Emacs, Eli Zaretskii, 2023/10/26
- bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping Emacs, Ihor Radchenko, 2023/10/26
- bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping Emacs, Eli Zaretskii, 2023/10/26
- bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping Emacs, Eli Zaretskii, 2023/10/26
- bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping Emacs, Ihor Radchenko, 2023/10/27
- bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping Emacs, Eli Zaretskii, 2023/10/27
- bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping Emacs, Ihor Radchenko, 2023/10/27
- bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping Emacs, Eli Zaretskii, 2023/10/27
- bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping Emacs, Mauro Aranda, 2023/10/27
- bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping Emacs, Ihor Radchenko, 2023/10/27
- bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping Emacs,
Ihor Radchenko <=
- bug#66742: 30.0.50; transient-mark-mode is not enabled after re-dumping Emacs, Eli Zaretskii, 2023/10/26