GNU bug report logs - #59882
30.0.50; Compilation of ELPA packages during version upgrade (Org 9.6 ELPA upgrade from older ELPA version)

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From: David Masterson <dsmasterson <at> gmail.com>
To: "Cook, Malcolm" <MEC <at> stowers.org>
Cc: Eli Zaretskii <eliz <at> gnu.org>, "emacs-orgmode <at> gnu.org" <emacs-orgmode <at> gnu.org>, "michel <at> schi.nz" <michel <at> schi.nz>, "59882 <at> debbugs.gnu.org" <59882 <at> debbugs.gnu.org>
Subject: bug#59882: Multiple versions of Org in load-path problem
Date: Fri, 09 Dec 2022 11:51:29 -0800

"Cook, Malcolm" <MEC <at> stowers.org> writes:

>> Eli Zaretskii <eliz <at> gnu.org> writes:
>> 
>> >> Cc: emacs-orgmode <at> gnu.org, 59882 <at> debbugs.gnu.org
>> >> From: David Masterson <dsmasterson <at> gmail.com>
>> >> Date: Thu, 08 Dec 2022 13:56:03 -0800
>> >>
>> >> In my testing, I found a strange case where, in *scratch*, I get:
>> >>
>> >> (message "%s" org-version)
>> >> ;; Error undefined
>> >> ;; Do 'C-h v org-version'
>> >> (message "%s" org-version)
>> >> 9.3
>> >>
>> >> So, 'describe-variable' on org-version causes Org to be loaded?!?
>> >
>> > Why is it so surprising?  Is this the first time you see that a Help
>> > command loads something to do its job?
>> 
>> Yes, it is surprising.  How did Emacs know to load Org to find org-version? 
>
> This is provided for via emacs' autoload by prefix mechanism.
>
> See:
>
> https://www.gnu.org/software/emacs/manual/html_node/elisp/Autoload-by-Prefix.html
>
> What you observed will NOT happen if you first run:
>
> 	(clrhash  definition-prefixes)

Ah! Thank you.  In many ways, I still think of Emacs from what I learned
about it in the early 80s (yes, pre-Elisp).  I didn't expect this and,
so, didn't investigate the possibility that it's planned (the Info
documentation has gotten huge).  Apologies to Eli.

-- 
David Masterson

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