Re: source-directory, installed Emacs, and C source

[Manuel Giraud via "Emacs development discussions." <emacs-devel@gnu.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Manuel Giraud <manuel@ledu-giraud.fr>
>> Cc: sbaugh@catern.com,  emacs-devel@gnu.org
>> Date: Wed, 25 Oct 2023 10:41:33 +0200
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> [...]
>> 
>> > AFAIR, Emacs looks for Lisp files by scanning load-path.  So if you
>> > customize load-path to include the directories in the source tree, you
>> > should be able to tell Emacs to look for the Lisp files in another
>> > directory.  I think that's what we do when Emacs is run uninstalled,
>> > and that's why it finds the Lisp files in the source tree.
>> 
>> This works… but not always.  Here is a test I've just done:
>> 
>>      - emacs -Q
>>      - then load the following:
>> --8<---------------cut here---------------start------------->8---
>> (add-to-list 'load-path "~/emacs-repo/lisp/")
>> (dolist (dir '("vc" "use-package" "url" "textmodes" "progmodes"
>> 	       "play" "org" "nxml" "net" "mh-e" "mail" "leim"
>> 	       "language" "international" "image" "gnus" "eshell"
>> 	       "erc" "emulation" "emacs-lisp" "cedet" "calendar"
>> 	       "calc" "obsolete"))
>>   (add-to-list 'load-path (format "~/emacs-repo/lisp/%s/" dir)))
>> --8<---------------cut here---------------end--------------->8---
>
> I never said you should just prepend the source tree to the previous
> value, did I?

No you did not say that.  But then what recipe with 'load-path' did you
have in mind to always look into the source tree?

> And anyway, are you sure you emulated Spencer's use case closely
> enough?  He never described in detail which files are where, but AFAIU
> at the very least you should have removed the *.el and *.el.gz files
> from the installation directory, since that is what he does (again,
> AFAIU).

Maybe this is what he does.  But then it is not what I imagined:
personally, I don't want to remove files from the installation
directory.
-- 
Manuel Giraud