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bug#39233: .elc file - possibly outdated backward compatibility comments
From: |
Stefan Kangas |
Subject: |
bug#39233: .elc file - possibly outdated backward compatibility comments |
Date: |
Fri, 24 Jan 2020 17:08:20 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Lars Ingebrigtsen <larsi@gnus.org> writes:
> Reading the fix for the compilation problem, it was:
>
> - (search-forward "\n;;; This file uses")
>
> It's quite possible that I misunderstand the patch, but doesn't this
> mean that (until a couple of days ago), Emacs assumed that that string
> exists in .elc files unconditionally. And now it does, so if you try to
> use an Emacs from last week to load .elc files from this week, that
> week-old Emacs will break?
That code is only run during byte-compilation, not when loading the
file. We add the lines, and then use them as an anchor to find the
location to add a version test for Emacs <23 if there are any utf-8
non-ASCII characters.
You could try on Emacs 26.1 `M-x load-file RET cperl-mode.elc RET'
using a file byte-compiled with current master to verify.
Best regards,
Stefan Kangas
- bug#39233: .elc file - possibly outdated backward compatibility comments, Stefan Kangas, 2020/01/22
- bug#39233: .elc file - possibly outdated backward compatibility comments, Eli Zaretskii, 2020/01/22
- bug#39233: .elc file - possibly outdated backward compatibility comments, Stefan Monnier, 2020/01/23
- bug#39233: .elc file - possibly outdated backward compatibility comments, Eli Zaretskii, 2020/01/24
- bug#39233: .elc file - possibly outdated backward compatibility comments, Eli Zaretskii, 2020/01/24
- bug#39233: .elc file - possibly outdated backward compatibility comments, Stefan Monnier, 2020/01/24
- bug#39233: .elc file - possibly outdated backward compatibility comments, Stefan Monnier, 2020/01/24
- bug#39233: .elc file - possibly outdated backward compatibility comments, Stefan Kangas, 2020/01/24
- bug#39233: .elc file - possibly outdated backward compatibility comments, Stefan Monnier, 2020/01/24
- bug#39233: .elc file - possibly outdated backward compatibility comments, Glenn Morris, 2020/01/24
- bug#39233: .elc file - possibly outdated backward compatibility comments, Eli Zaretskii, 2020/01/24