Subject: bug#78783: 30.1.50; AOT-compiling site-lisp during the Emacs build doesn't work

From: Spencer Baugh <[email-masked]>
Date: Fri, 13 Jun 2025 11:41:27 -0400

Eli Zaretskii <[email-masked]> writes:
> severity 78783 wishlist
> thanks
>
>> Cc: Andrea Corallo <[email-masked]>, [email-masked]
>> Date: Fri, 13 Jun 2025 09:34:10 -0400
>> From:  Spencer Baugh via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <[email-masked]>
>> 
>> 
>> Native compilation of site-lisp directories during the Emacs build
>> (e.g. --with-native-compilation=aot) produces .eln files which are
>> unused when installed.
>
> Why are you compiling files in site-lisp during the build?  This is
> not supported, and I see no reason why we should extend our build
> processes to support it.
>
> Why cannot you compile site-lisp files after Emacs is built and
> installed?

If a site-lisp file is built (whether as part of Emacs or not) and
subsequently installed into the site-lisp directory, its file name will
change.  That changes the path_hash computed by
comp-el-to-eln-rel-filename which will cause this issue.

This is a general problem with AOT-compiling files which are
subsequently installed somewhere else.  It applies both for core Emacs
files and for site-lisp.