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bug#19564: 24.4; eieio backward compatibility

From: Ivan Shmakov
Subject: bug#19564: 24.4; eieio backward compatibility
Date: Tue, 13 Jan 2015 15:27:16 +0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

>>>>> "TZ" == Ted Zlatanov <address@hidden> writes:
>>>>> On Tue, 13 Jan 2015 15:50:48 +0100 Thierry Volpiatto wrote:
>>>>> Ted Zlatanov <address@hidden> writes:


 TZ> Forgive my ignorance: is that compatibility guaranteed or
 TZ> beneficial?

 TV> No, but that's mean that now with these recent changes all people
 TV> using helm will have errors in their helm packages when switching
 TV> emacs-version until they reinstall all; And for sure they will not
 TV> reinstall and I expect tons of bugreport in next weeks... (I
 TV> crossfingers hoping I am wrong)

 TZ> Maybe Emacs needs a shell-level way to recompile all or some
 TZ> installed packages?

        The approach used in Debian is that the Debian “binary” packages
        contain only the source code (.el), and the respective
        byte-compiled (.elc) files are produced at the installation
        time, – for /each/ of the installed Emacs versions.

        So, when, say, gnugo.el is installed, in addition to
        /usr/share/emacs/site-lisp/gnugo.el, the following files may
        also appear on the filesystem (depending on the versions of
        Emacs installed on the system):


        I’m not sure whether Emacs itself handles it well when it comes
        to, say, C-h f.  And frankly, for backup purposes, I’d rather
        prefer all that to go under /var/cache instead.  (And the same
        for __pycache__, etc.)

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