GNU bug report logs - #79326
30.2; EIEIO autoload does not add to class children

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: "B. Szilvasy" <emacs-pkgs <at> eutro.dev>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.2; EIEIO autoload does not add to class children
Date: Wed, 27 Aug 2025 23:15:04 +0100

EIEIO autoloads generated with an autoload cookie on a `defclass' do not
add the class to the superclasses' `eieio-class-children'. My use-case
is that I wanted to have a customize variable with an open set of
possible types the user could choose from, based on the EIEIO class
hierarchy.

The code to reproduce this follows:

;;; the-defclass.el --- Class definitions -*- lexical-binding: t -*-
(require 'eieio)

;;;###autoload
(defclass the-baseclass () ())
;;;###autoload
(defclass the-derivedclass (the-baseclass) ())

(provide 'the-defclass)
;;; the-defclass.el ends here


;;; the-repro.el --- Testing functions -*- lexical-binding: t -*-
(require 'eieio)

;;;###autoload
(defun the-check-children ()
  "Write the children of `the-baseclass'."
  (interactive)
  (message "%S" (eieio-class-children 'the-baseclass)))

(defconst the-directory (file-name-directory (or load-file-name 
(buffer-file-name))))

;;;###autoload
(defun the-loaddefs-generate ()
  "Generate loaddefs for this directory."
  (interactive)
  (let* ((autoload-file (expand-file-name "the-loaddefs.el" 
the-directory)))
    (loaddefs-generate
     the-directory autoload-file
     nil nil nil 'generate-full)))

(provide 'the-repro)
;;; the-repro.el ends here


On my machine, running the following commands from a directory
containing these two files produces these results:

$ emacs -Q --batch -L $PWD -l the-repro -f the-loaddefs-generate
  INFO Scraping 3 files for loaddefs...
  INFO Scraping 3 files for loaddefs...done
  GEN the-loaddefs.el
$ emacs -Q --batch -L $PWD -l the-loaddefs -f the-check-children \
   -l the-defclass -f the-check-children
nil
(the-derivedclass)


The generated loaddefs call `eieio-defclass-autoload' as expected, and
set the derived class' parents correctly (if the parents are loaded),
but do not add the derived class as the base classes' children at all.
From my own bisect, this ostensibly used to work but was first broken
in, 24b7f77581c7eefe484db6cbbd661c04460c66aa "Stefan Monnier 2015-01-16
Improve handling of doc-strings and describe-function for cl-generic",
which changed `eieio-defclass-autoload' to ignore the superclasses
parameter, and then not later fixed in
bd017175d4571e24ef1fdf84676136af1d36002d "Stefan Monnier 2024-03-08
Simplify type hierarchy operations" which made `eieio-defclass-autoload'
set the derived class' parents again, but not the base class' children.
Notably the `eieio-defclass-autoload-map' variable which drove
some of this before is currently never written to.

I have half-written a patch to fix this, which I may send later on.

Best,
Beatrice

In GNU Emacs 30.2 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.50,
cairo version 1.18.4)
Windowing system distributor 'The X.Org Foundation', version 11.0.12401006
System Description: Manjaro Linux

Configured using:
'configure --with-x-toolkit=gtk3 --sysconfdir=/etc --prefix=/usr
--libexecdir=/usr/lib --localstatedir=/var --disable-build-details
--with-cairo --with-harfbuzz --with-libsystemd --with-modules
--with-native-compilation=aot --with-tree-sitter 'CFLAGS=-march=x86-64
-mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=3
-Wformat -Werror=format-security -fstack-clash-protection
-fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -g
-ffile-prefix-map=/build/emacs/src=/usr/src/debug/emacs -flto=auto'
'LDFLAGS=-Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro
-Wl,-z,now -Wl,-z,pack-relative-relocs -flto=auto''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
value of $LC_MONETARY: en_GB.UTF-8
value of $LC_NUMERIC: en_GB.UTF-8
value of $LC_TIME: en_GB.UTF-8
value of $LANG: en_GB.UTF-8
locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
tooltip-mode: t
global-eldoc-mode: t
eldoc-mode: t
show-paren-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
minibuffer-regexp-mode: t
line-number-mode: t
indent-tabs-mode: t
transient-mark-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util text-property-search time-date subr-x mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
cl-loaddefs cl-lib sendmail rfc2047 rfc2045 ietf-drums mm-util
mail-prsvr mail-utils rmc iso-transl tooltip cconv eldoc paren electric
uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel
term/x-win x-win term/common-win x-dnd touch-screen tool-bar dnd fontset
image regexp-opt fringe tabulated-list replace newcomment text-mode
lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch
easymenu timer select scroll-bar mouse jit-lock font-lock syntax
font-core term/tty-colors frame minibuffer nadvice seq simple cl-generic
indonesian philippine cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
composite emoji-zwj charscript charprop case-table epa-hook
jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
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dynamic-setting system-font-setting font-render-setting cairo gtk
x-toolkit xinput2 x multi-tty move-toolbar make-network-process
native-compile emacs)

Memory information:
((conses 16 48999 9022) (symbols 48 5372 0) (strings 32 13593 2186)
(string-bytes 1 393479) (vectors 16 9004)
(vector-slots 8 125777 8538) (floats 8 22 13) (intervals 56 264 0)
(buffers 992 10))

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