bug#19564: 24.4; eieio backward compatibility

[Thierry Volpiatto]

Hi,

today I have fixed in helm an eieio error according to this
bugreport:

http://debbugs.gnu.org/cgi/bugreport.cgi?bug=19552

Following Stefan advice, I have added a defalias:

(unless (fboundp 'class-slot-initarg)
  (defalias 'class-slot-initarg 'eieio--class-slot-initarg))

It was working fine, but after upgrading again emacs-25, it seems eieio
raise another error:

When I try to compile helm I have:

Error: Wrong type argument: eieio--class-p, helm-locate-source

@Stefan Can you clarify what do we have to do actually to make eieio
backward compatible or if nothing have to be done on our side (external
developers) can you please fix this issue.

Thanks.




In GNU Emacs 24.4.1 (x86_64-unknown-linux-gnu, X toolkit)
 of 2014-10-24 on dell-14z
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:     Ubuntu 14.04.1 LTS

Configured using:
 `configure --with-x-toolkit=lucid --without-toolkit-scroll-bars
 --without-gconf --without-gsettings'

Important settings:
  value of $LANG: fr_FR.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
  git-gutter-mode: t
  psession-mode: t
  golden-ratio-mode: t
  winner-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  auto-image-file-mode: t
  eldoc-in-minibuffer-mode: t
  show-paren-mode: t
  display-time-mode: t
  recentf-mode: t
  savehist-mode: t
  eldoc-mode: t
  minibuffer-depth-indicate-mode: t
  helm-mode: t
  helm-descbinds-mode: t
  shell-dirtrack-mode: t
  helm-adaptive-mode: t
  helm-match-plugin-mode: t
  helm-occur-match-plugin-mode: t
  helm-autoresize-mode: t
  tooltip-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<up> <up> C-M-SPC M-w M-x r e p o r t <return>

Recent messages:
Indentation setup for shell type sh
Setting up indent for shell type bash
Indentation variables are now local.
Indentation setup for shell type bash
Restoring buffers...89%
Setting up indent for shell type sh
Indentation variables are now local.
Indentation setup for shell type sh
Restoring buffers...done
Mark set

Load-path shadows:
~/elisp/auctex/lpath hides ~/elisp/emacs-wget/lpath
/usr/local/share/emacs/24.4/lisp/emacs-lisp/tq hides ~/elisp/emms/lisp/tq

Features:
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emacs)

Memory information:
((conses 16 611361 47913)
 (symbols 48 62955 5)
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 (strings 32 154118 19606)
 (string-bytes 1 4536337)
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 (heap 1024 58202 2703))
-- 
Thierry
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