GNU bug report logs - #78783
30.1.50; AOT-compiling site-lisp during the Emacs build doesn't work

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From: Andrea Corallo <acorallo <at> gnu.org>
To: Spencer Baugh <sbaugh <at> janestreet.com>
Cc: app-emacs-dev <at> janestreet.com, 78783 <at> debbugs.gnu.org
Subject: bug#78783: 30.1.50; AOT-compiling site-lisp during the Emacs build doesn't work
Date: Thu, 10 Jul 2025 17:11:56 -0400

Spencer Baugh <sbaugh <at> janestreet.com> writes:

> Native compilation of site-lisp directories during the Emacs build
> (e.g. --with-native-compilation=aot) produces .eln files which are
> unused when installed.
>
> The reason is that the absolute file name of the site-lisp directory
> differs between build-time and install-time, and therefore
> comp-el-to-eln-rel-filename computes a different path hash for the files
> contained in site-lisp at build-time and at install-time.
>
> The same issue would affect AOT native compilation of all Lisp in Emacs,
> except that there's a workaround built into comp-el-to-eln-rel-filename,
> as explained by this comment:
>
>      As installing .eln files compiled during the build changes their
>      absolute path we need an hashing mechanism that is not sensitive
>      to that.  For this we replace if match PATH_DUMPLOADSEARCH or
>      *PATH_REL_LOADSEARCH with '//' before computing the hash.
>
> In other words, file names containing e.g. "30.1.50/lisp", like
> "/usr/local/share/emacs/30.1.50/lisp/foo.el", are transformed to
> "//foo.el" before the path hash is computed.
>
> I suggest the same should be done for file names containing
> "30.1.50/site-lisp".  That would resolve the problem and allow site-lisp
> to actually be AOT-compiled.

Mmmmh I don't think it would work as AFAIU not all distros embed the
version in the path:

https://fedoraproject.org/wiki/QA%3ATestcase_emacs_filesystem

https://build.opensuse.org/projects/editors/packages/emacs/files/macros.emacs?expand=0&

Andrea

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