From: Andreas Schwab <schwab@linux-m68k.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: Warning on files byte-compiled with different versions
Date: Sun, 14 Feb 2016 16:02:29 +0100 [thread overview]
Message-ID: <87a8n39vy2.fsf@linux-m68k.org> (raw)
In-Reply-To: <jwv7fi78kb4.fsf-monnier+gmane.emacs.devel@gnu.org> (Stefan Monnier's message of "Sun, 14 Feb 2016 09:00:56 -0500")
Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> So, the answer is no, AFAICT. Second question, is there any reason why
>> this kind of functionality could not be added?
>
> Indeed. The byte-compiler could simply emit
>
> `(if (< emacs-major-version ,emacs-major-version)
> (message "This file was compiled for a more recent Emacs"))
>
> at the beginning of every file. IIRC we used to do something like that.
We have the bytecode version encoded in the header, and a check if it
contains multi-byte characters. Just because the file was compiled by a
later version should not be a reason to prevent loading it, only if the
format itself changes.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2016-02-14 15:02 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-11 14:08 Warning on files byte-compiled with different versions Phillip Lord
2016-02-12 14:09 ` Phillip Lord
2016-02-14 14:00 ` Stefan Monnier
2016-02-14 15:02 ` Andreas Schwab [this message]
2016-02-14 17:15 ` Stefan Monnier
2016-02-14 17:29 ` Andreas Schwab
2016-02-20 2:29 ` John Wiegley
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