GNU bug report logs - #78818
31.0.50; Missing lexical-binding cookies when compiling trampolines

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From: Eli Zaretskii <eliz <at> gnu.org>
To: mail <at> daniel-mendler.de, Andrea Corallo <acorallo <at> gnu.org>
Cc: 78818 <at> debbugs.gnu.org
Subject: bug#78818: 31.0.50; Missing lexical-binding cookies when compiling trampolines
Date: Sat, 05 Jul 2025 10:33:44 +0300

Ping!  Daniel, could you please respond?

> From: Andrea Corallo <acorallo <at> gnu.org>
> Cc: Daniel Mendler <mail <at> daniel-mendler.de>,  78818 <at> debbugs.gnu.org
> Date: Mon, 23 Jun 2025 16:09:13 -0400
> 
> Andrea Corallo <acorallo <at> gnu.org> writes:
> 
> > Eli Zaretskii <eliz <at> gnu.org> writes:
> >
> >>> From: Daniel Mendler <mail <at> daniel-mendler.de>
> >>> Cc: 78818 <at> debbugs.gnu.org, Andrea Corallo <acorallo <at> gnu.org>
> >>> Date: Wed, 18 Jun 2025 13:52:42 +0200
> >>>
> >>> Eli Zaretskii <eliz <at> gnu.org> writes:
> >>>
> >>> >> Date: Tue, 17 Jun 2025 20:38:20 +0200
> >>> >> From:  Daniel Mendler via "Bug reports for GNU Emacs,
> >>> >>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> >>> >>
> >>> >> In the *Native-compile-Log* I see the following messages on a newly
> >>> >> compiled Emacs 31 from the current Emacs master branch:
> >>> >>
> >>> >> Warning (files): Missing ‘lexical-binding’ cookie in "/tmp/emacs-int-comp-subr--trampoline-72756e2d686f6f6b73_run_hooks_0-ZQkOM2.el".
> >>> >> You can add one with ‘M-x elisp-enable-lexical-binding RET’.
> >>> >> See ‘(elisp)Selecting Lisp Dialect’ and ‘(elisp)Converting to Lexical Binding’
> >>> >> for more information.
> >>> >> Compiling $HOME/.config/emacs/eln-cache/31.0.50-45ab2aa9/subr--trampoline-72756e2d686f6f6b73_run_hooks_0.eln...
> >>> >
> >>> > Please show a recipe to reproduce this problem starting from "emacs -Q".
> >>> > Or at least figure out and tell here compilation of what ELisp file
> >>> > triggered this message (it sounds like it's part of your init
> >>> > configuration?).  I started "emacs -Q", but didn't see any such
> >>> > messages that I could use as a starting point for investigation.
> >>> >
> >>> > Or, if I'm missing something, could you suggest how to investigate
> >>> > this given the information you provided above?
> >>>
> >>> The trampoline .el file is generated by `comp--final' in comp.el. I
> >>> found this by grepping for `emacs-int-comp'. The generated Elisp file
> >>> doesn't include a `lexical-binding' cookie, which seems to trigger the
> >>> warning. As far as I understand the trampolines are generated if native
> >>> subrs are advised in the configuration.
> >>
> >> Thanks.  We insert the lexical-binding cookie in
> >> comp--run-async-workers, but maybe trampoline compilation doesn't use
> >> that?
> >>
> >> Andrea, any suggestions?
> >
> > Yep, I'm testing this I think it should work:
> >
> > modified   lisp/emacs-lisp/comp.el
> > @@ -3363,7 +3363,7 @@ comp--final
> >                           nil ".el"))
> >               (default-directory invocation-directory))
> >          (with-temp-file temp-file
> > -          (insert ";; -*-coding: utf-8-emacs-unix; -*-\n")
> > +          (insert ";; -*- coding: utf-8-emacs-unix; lexical-binding: t -*-\n")
> >            (mapc (lambda (e)
> >                    (insert (prin1-to-string e)))
> >                  expr))
> 
> Ok I think it works so I've installed it on master as baf0c822026.
> 
> Daniel could you double check it works for your case?
> 
> Thanks
> 
>   Andrea
> 

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