GNU bug report logs - #27253
25.2; Suggestion: On startup after Emacs version change, package should offer to correct invalid bytecode

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: nljlistbox2 <at> gmail.com (N. Jackson)
To: bug-gnu-emacs <at> gnu.org
Subject: 25.2;
 Suggestion: On startup after Emacs version change, package should
 offer to correct invalid bytecode
Date: Mon, 05 Jun 2017 11:19:08 -0400

It would be nice on Emacs startup, if Package could detect
incompatible byte code in packages compiled with a different
version of Emacs, and offer to recompile them.

What happens now in this situation is that on startup a message is
displayed complaining of invalid byte code in the user's init file
which is slightly confusing, and not very helpful. [Or, at least,
not as helpful as offering to recompile the offending package.]


In GNU Emacs 25.2.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.22.11)
 of 2017-04-26 built on moondust.localdomain
Windowing system distributor 'Fedora Project', version 11.0.11903000
System Description:	Fedora release 25 (Twenty Five)

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS NOTIFY ACL
LIBSELINUX GNUTLS LIBXML2 FREETYPE LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11

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  value of $XMODIFIERS: @im=none
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Message #8 received at 27253 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: nljlistbox2 <at> gmail.com (N. Jackson)
Cc: 27253 <at> debbugs.gnu.org
Subject: Re: bug#27253: 25.2; Suggestion: On startup after Emacs version
 change, package should offer to correct invalid bytecode
Date: Tue, 17 May 2022 21:08:05 +0200

nljlistbox2 <at> gmail.com (N. Jackson) writes:

> It would be nice on Emacs startup, if Package could detect
> incompatible byte code in packages compiled with a different
> version of Emacs, and offer to recompile them.
>
> What happens now in this situation is that on startup a message is
> displayed complaining of invalid byte code in the user's init file
> which is slightly confusing, and not very helpful. [Or, at least,
> not as helpful as offering to recompile the offending package.]

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

Do you have an example of such a message on startup?

In general, it's not just invalid bytecode that's a problem, but also
other things like macros that have changed definitions (so the old
.elc doesn't quite work right).  But that's hard to detect.

There should perhaps be a command to recompile all installed packages?
Or does that exist somewhere?  (I don't see any such command...)

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #13 received at 27253 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: nljlistbox2 <at> gmail.com (N. Jackson)
Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, 27253 <at> debbugs.gnu.org
Subject: Re: bug#27253: 25.2; Suggestion: On startup after Emacs version
 change, package should offer to correct invalid bytecode
Date: Wed, 15 Jun 2022 18:44:25 +0200

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> There should perhaps be a command to recompile all installed packages?
> Or does that exist somewhere?  (I don't see any such command...)

Perhaps Stefan knows; added to the CCs.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #16 received at 27253 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: "N. Jackson" <nljlistbox2 <at> gmail.com>, 27253 <at> debbugs.gnu.org
Subject: Re: bug#27253: 25.2; Suggestion: On startup after Emacs version
 change, package should offer to correct invalid bytecode
Date: Wed, 15 Jun 2022 13:18:29 -0400

Lars Ingebrigtsen [2022-06-15 18:44:25] wrote:
> Lars Ingebrigtsen <larsi <at> gnus.org> writes:
>> There should perhaps be a command to recompile all installed packages?
>> Or does that exist somewhere?  (I don't see any such command...)
> Perhaps Stefan knows; added to the CCs.

There should be a command/function to recompile an installed package,
and maybe another to do the same for all packages, yes.

I don't think the OP's situation would be best served by recompiling
everything, because usually recompilation is only needed for those few
packages that were compiled a *long* time ago ( where I'd expect most
packages have probably been recompiled since then because of
package updates).

But there's definitely room for improvement along the path of:
detecting the presence of a file that's too old, figuring out which
package needs to be recompiled, and then recompiling it.


        Stefan

Message #19 received at 27253 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: "N. Jackson" <nljlistbox2 <at> gmail.com>, 27253 <at> debbugs.gnu.org
Subject: Re: bug#27253: 25.2; Suggestion: On startup after Emacs version
 change, package should offer to correct invalid bytecode
Date: Thu, 16 Jun 2022 13:50:48 +0200

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

> There should be a command/function to recompile an installed package,
> and maybe another to do the same for all packages, yes.

OK; I've now added two commands for that to Emacs 29.

> I don't think the OP's situation would be best served by recompiling
> everything, because usually recompilation is only needed for those few
> packages that were compiled a *long* time ago ( where I'd expect most
> packages have probably been recompiled since then because of
> package updates).
>
> But there's definitely room for improvement along the path of:
> detecting the presence of a file that's too old, figuring out which
> package needs to be recompiled, and then recompiling it.

I'm not sure there's any way of doing that that would be reliable enough
not to be annoying?  That is, we can determine if an .elc file is
readable, but we can't really detect if it's using a macro that has
changed so much that the .elc file should be rebuilt...

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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