GNU bug report logs - #80873
31.0.50; "C-h f" signals an error for font-setting-change-default-font

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Package: emacs; Reported by: Eli Zaretskii <eliz@HIDDEN>; dated Tue, 21 Apr 2026 05:43:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Date: Wed, 06 May 2026 14:32:13 +0300
Message-Id: <86ecjoai4i.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Stefan Monnier <monnier@HIDDEN>
In-Reply-To: <jwvbjetha8p.fsf-monnier+emacs@HIDDEN> (message from Stefan
 Monnier on Tue, 05 May 2026 16:49:33 -0400)
Subject: Re: bug#80873: 31.0.50; "C-h f" signals an error for
 font-setting-change-default-font
References: <86bjfcg98e.fsf@HIDDEN> <jwvfr48zkzh.fsf-monnier+emacs@HIDDEN>
 <86mryebbnp.fsf@HIDDEN> <jwvbjetha8p.fsf-monnier+emacs@HIDDEN>
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> From: Stefan Monnier <monnier@HIDDEN>
> Cc: 80873 <at> debbugs.gnu.org,  luangruo@HIDDEN
> Date: Tue, 05 May 2026 16:49:33 -0400
>=20
> >> I can't reproduce it here because in my build `dynamic-setting` is
> >> preloaded, but can you try the patch below?
> > The error is gone with this patch,
>=20
> Thanks, I pushed (a variant of) the patch to `master`: regardless of the
> current bug report, I believe it's The Right Thing=E2=84=A2 to do anyway.

Thanks.

> > but now, after I type "C-h f font-setting-change-default-font RET",
> > featurep says dynamic-setting is loaded.  Is that intended?
>=20
> Not sure if it's intended, but it doesn't strike me as undesirable.
> It presumably depends on `help-enable-*autoload`.

It does.  If help-enable-*autoload are nil, I get "[No match]" when I
press RET.

> `help--symbol-completion-table` has code to try and avoid (auto)loading
> files in similar situations, so maybe it's indeed unintended.
> Can you show a backtrace of the load itself (e.g. with an appropriate
> `after-load-functions` that calls `debug` when loading that specific
> file)?

Below.

Debugger entered: nil
  (if (equal (file-name-nondirectory (file-name-sans-extension fn)) "dynami=
c-setting") (debug))
  my-debug("d:/gnu/git/emacs/trunk/lisp/dynamic-setting.elc")
  run-hook-with-args(my-debug "d:/gnu/git/emacs/trunk/lisp/dynamic-setting.=
elc")
  do-after-load-evaluation("d:/gnu/git/emacs/trunk/lisp/dynamic-setting.elc=
")
  load("dynamic-setting" noerror nomessage)
  help--load-prefixes((("font-setting-change-default-font" "dynamic-setting=
")))
  help--symbol-completion-table("font-setting-change-default-font" #f(compi=
led-function (f) #<bytecode -0x5d27df420b25408>) nil)
  try-completion("font-setting-change-default-font" help--symbol-completion=
-table #f(compiled-function (f) #<bytecode -0x5d27df420b25408>))
  completion-basic-try-completion("font-setting-change-default-font" help--=
symbol-completion-table #f(compiled-function (f) #<bytecode -0x5d27df420b25=
408>) 32)
  #f(compiled-function () #<bytecode -0x7daa36939427c88>)()
  funcall(#f(compiled-function () #<bytecode -0x7daa36939427c88>))
  (let nil (funcall '#f(compiled-function () #<bytecode -0x7daa36939427c88>=
)))
  eval((let nil (funcall '#f(compiled-function () #<bytecode -0x7daa3693942=
7c88>))))
  #f(compiled-function (style) #<bytecode 0x116f399729dbb5d>)(basic)
  #f(compiled-function (elt) #<bytecode -0x2c8047cb193b049>)(basic)
  mapc(#f(compiled-function (elt) #<bytecode -0x2c8047cb193b049>) (basic sh=
orthand substring partial-completion emacs22))
  seq-do(#f(compiled-function (elt) #<bytecode -0x2c8047cb193b049>) (basic =
shorthand substring partial-completion emacs22))
  seq-some(#f(compiled-function (style) #<bytecode 0x116f399729dbb5d>) (bas=
ic shorthand substring partial-completion emacs22))
  completion--nth-completion(1 "font-setting-change-default-font" help--sym=
bol-completion-table #f(compiled-function (f) #<bytecode -0x5d27df420b25408=
>) 32 (metadata (category . symbol-help)))
  completion-try-completion("font-setting-change-default-font" help--symbol=
-completion-table #f(compiled-function (f) #<bytecode -0x5d27df420b25408>) =
32 (metadata (category . symbol-help)))
  completion--do-completion(20 52 nil expect-exact)
  #f(compiled-function () #<bytecode -0xec22ef17d485ff>)()
  completion--complete-and-exit(20 52 exit-minibuffer #f(compiled-function =
() #<bytecode -0xec22ef17d485ff>))
  completion-complete-and-exit(20 52 exit-minibuffer)
  minibuffer-complete-and-exit(nil)
  funcall-interactively(minibuffer-complete-and-exit nil)
  call-interactively(minibuffer-complete-and-exit nil nil)
  command-execute(minibuffer-complete-and-exit)
  read-from-minibuffer("Describe function: " nil (keymap (10 . minibuffer-c=
omplete-and-exit) (13 . minibuffer-complete-and-exit) keymap (menu-bar keym=
ap (minibuf "Minibuf" keymap (tab menu-item "Complete" minibuffer-complete =
:help "Complete as far as possible") (space menu-item "Complete Word" minib=
uffer-complete-word :help "Complete at most one word") (63 menu-item "List =
Completions" minibuffer-completion-help :help "Display all possible complet=
ions") "Minibuf")) (M-down . minibuffer-next-completion) (M-up . minibuffer=
-previous-completion) (27 keymap (13 . minibuffer-choose-completion) (103 k=
eymap (27 keymap (99 . switch-to-completions))) (118 . switch-to-completion=
s)) (prior . switch-to-completions) (63 . minibuffer-completion-help) (13 .=
 minibuffer-completion-exit) (32 . minibuffer-complete-word) (backtab . min=
ibuffer-complete) (9 . minibuffer-complete) keymap (menu-bar keymap (minibu=
f "Minibuf" keymap (previous menu-item "Previous History Item" previous-his=
tory-element :help "Put previous minibuffer history element in the minibuff=
er") (next menu-item "Next History Item" next-history-element :help "Put ne=
xt minibuffer history element in the minibuffer") (isearch-backward menu-it=
em "Isearch History Backward" isearch-backward :help "Incrementally search =
minibuffer history backward") (isearch-forward menu-item "Isearch History F=
orward" isearch-forward :help "Incrementally search minibuffer history forw=
ard") (return menu-item "Enter" exit-minibuffer :key-sequence "\15" :help "=
Terminate input and exit minibuffer") (quit menu-item "Quit" abort-recursiv=
e-edit :help "Abort input and exit minibuffer") "Minibuf")) (24 keymap (dow=
n . minibuffer-complete-defaults) (up . minibuffer-complete-history)) (13 .=
 exit-minibuffer) (10 . exit-minibuffer) (7 . abort-minibuffers) (C-tab . f=
ile-cache-minibuffer-complete) (9 . self-insert-command) (XF86Back . previo=
us-history-element) (up . previous-line-or-history-element) (prior . previo=
us-history-element) (XF86Forward . next-history-element) (down . next-line-=
or-history-element) (next . next-history-element) (27 keymap (60 . minibuff=
er-beginning-of-buffer) (114 . previous-matching-history-element) (115 . ne=
xt-matching-history-element) (112 . previous-history-element) (110 . next-h=
istory-element))) nil nil nil nil)
  completing-read-default("Describe function: " help--symbol-completion-tab=
le #f(compiled-function (f) #<bytecode -0x5d27df420b25408>) t nil nil nil n=
il)
  completing-read("Describe function: " help--symbol-completion-table #f(co=
mpiled-function (f) #<bytecode -0x5d27df420b25408>) t nil nil nil)
  help-fns--describe-function-or-command-prompt()
  call-interactively(describe-function nil nil)
  command-execute(describe-function)
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80873; Package emacs. Full text available.

Message received at 80873 <at> debbugs.gnu.org:


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From: Stefan Monnier <monnier@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#80873: 31.0.50; "C-h f" signals an error for
 font-setting-change-default-font
In-Reply-To: <86mryebbnp.fsf@HIDDEN>
Message-ID: <jwvbjetha8p.fsf-monnier+emacs@HIDDEN>
References: <86bjfcg98e.fsf@HIDDEN> <jwvfr48zkzh.fsf-monnier+emacs@HIDDEN>
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Date: Tue, 05 May 2026 16:49:33 -0400
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>> I can't reproduce it here because in my build `dynamic-setting` is
>> preloaded, but can you try the patch below?
> The error is gone with this patch,

Thanks, I pushed (a variant of) the patch to `master`: regardless of the
current bug report, I believe it's The Right Thing=E2=84=A2 to do anyway.

> but now, after I type "C-h f font-setting-change-default-font RET",
> featurep says dynamic-setting is loaded.  Is that intended?

Not sure if it's intended, but it doesn't strike me as undesirable.
It presumably depends on `help-enable-*autoload`.

`help--symbol-completion-table` has code to try and avoid (auto)loading
files in similar situations, so maybe it's indeed unintended.
Can you show a backtrace of the load itself (e.g. with an appropriate
`after-load-functions` that calls `debug` when loading that specific
file)?



=3D=3D=3D Stefan
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80873; Package emacs. Full text available.

Message received at 80873 <at> debbugs.gnu.org:


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Date: Tue, 05 May 2026 09:42:02 +0300
Message-Id: <86mryebbnp.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Stefan Monnier <monnier@HIDDEN>
In-Reply-To: <jwvfr48zkzh.fsf-monnier+emacs@HIDDEN> (message from Stefan
 Monnier on Sun, 03 May 2026 09:35:03 -0400)
Subject: Re: bug#80873: 31.0.50; "C-h f" signals an error for
 font-setting-change-default-font
References: <86bjfcg98e.fsf@HIDDEN> <jwvfr48zkzh.fsf-monnier+emacs@HIDDEN>
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> From: Stefan Monnier <monnier@HIDDEN>
> Cc: 80873 <at> debbugs.gnu.org,  Po Lu <luangruo@HIDDEN>
> Date: Sun, 03 May 2026 09:35:03 -0400
> 
> Eli Zaretskii [2026-04-21 08:42:25] wrote:
> 
> > From: eliz@HIDDEN
> > --text follows this line--
> > To reproduce:
> >
> >   emacs -Q
> >   C-h f font-setting-change-default-font RET
> >
> > This signals an error:
> >
> >   user-error: Symbol’s function definition is void: font-setting-change-default-font
> 
> I can't reproduce it here because in my build `dynamic-setting` is
> preloaded, but can you try the patch below?

The error is gone with this patch, but now, after I type "C-h f
font-setting-change-default-font RET", featurep says dynamic-setting
is loaded.  Is that intended?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80873; Package emacs. Full text available.

Message received at 80873 <at> debbugs.gnu.org:


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From: Stefan Monnier <monnier@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#80873: 31.0.50; "C-h f" signals an error for
 font-setting-change-default-font
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Message-ID: <jwvfr48zkzh.fsf-monnier+emacs@HIDDEN>
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Eli Zaretskii [2026-04-21 08:42:25] wrote:

> From: eliz@HIDDEN
> --text follows this line--
> To reproduce:
>
>   emacs -Q
>   C-h f font-setting-change-default-font RET
>
> This signals an error:
>
>   user-error: Symbol=E2=80=99s function definition is void: font-setting-=
change-default-font

I can't reproduce it here because in my build `dynamic-setting` is
preloaded, but can you try the patch below?


=3D=3D=3D Stefan


diff --git a/lisp/help-fns.el b/lisp/help-fns.el
index f1ee109c87e..0cb59fc4abe 100644
--- a/lisp/help-fns.el
+++ b/lisp/help-fns.el
@@ -215,6 +215,7 @@ help--symbol-completion-table
           (help--load-prefixes prefixes))))
     (let ((prefix-completions
            (and help-enable-completion-autoload
+                (not (eq action 'lambda))
                 (mapcar #'intern (all-completions string definition-prefix=
es)))))
       (complete-with-action action obarray string
                             (if pred (lambda (sym)
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80873; Package emacs. Full text available.

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Date: Sat, 02 May 2026 19:00:52 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: Stefan Monnier <monnier@HIDDEN>
In-Reply-To: <jwvlde1zvjn.fsf-monnier+emacs@HIDDEN> (message from Stefan
 Monnier on Sat, 02 May 2026 11:22:17 -0400)
Subject: Re: bug#80873: 31.0.50; "C-h f" signals an error for
 font-setting-change-default-font
References: <86bjfcg98e.fsf@HIDDEN> <86a4ui9lsm.fsf@HIDDEN>
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> From: Stefan Monnier <monnier@HIDDEN>
> Cc: luangruo@HIDDEN,  80873 <at> debbugs.gnu.org
> Date: Sat, 02 May 2026 11:22:17 -0400
> 
> >> >> To reproduce:
> >> >> 
> >> >>   emacs -Q
> >> >>   C-h f font-setting-change-default-font RET
> >> >> 
> >> >> This signals an error:
> >> >> 
> >> >>   user-error: Symbol’s function definition is void: font-setting-change-default-font
> >> 
> >> That sounds about right.  We could maybe change the `C-h f` code so it
> >> catches the error and displays a *Help* buffer that basically says the
> >> same as the error, but in any case, this seems like a very minor issue.
> >
> > Can we do what happens when the symbol is not known to Emacs,
> > i.e. ring the bell and say "[No match]" when the user presses RET?
> > That's what I would expect to see in that case.
> 
> Ah, maybe we can do that without too much trouble.
> I'll take a look.

Thanks.
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bug#80873; Package emacs. Full text available.

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From: Stefan Monnier <monnier@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#80873: 31.0.50; "C-h f" signals an error for
 font-setting-change-default-font
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>> >> To reproduce:
>> >>=20
>> >>   emacs -Q
>> >>   C-h f font-setting-change-default-font RET
>> >>=20
>> >> This signals an error:
>> >>=20
>> >>   user-error: Symbol=E2=80=99s function definition is void: font-sett=
ing-change-default-font
>>=20
>> That sounds about right.  We could maybe change the `C-h f` code so it
>> catches the error and displays a *Help* buffer that basically says the
>> same as the error, but in any case, this seems like a very minor issue.
>
> Can we do what happens when the symbol is not known to Emacs,
> i.e. ring the bell and say "[No match]" when the user presses RET?
> That's what I would expect to see in that case.

Ah, maybe we can do that without too much trouble.
I'll take a look.


=3D=3D=3D Stefan
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80873; Package emacs. Full text available.

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In-Reply-To: <86mryh97mo.fsf@HIDDEN> (message from Eli Zaretskii on Sat, 02
 May 2026 18:02:55 +0300)
Subject: Re: bug#80873: 31.0.50;
 "C-h f" signals an error for font-setting-change-default-font
References: <86bjfcg98e.fsf@HIDDEN> <86a4ui9lsm.fsf@HIDDEN>
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> Cc: luangruo@HIDDEN, 80873 <at> debbugs.gnu.org
> Date: Sat, 02 May 2026 18:02:55 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> 
> > From: Stefan Monnier <monnier@HIDDEN>
> > Cc: Po Lu <luangruo@HIDDEN>,  80873 <at> debbugs.gnu.org
> > Date: Sat, 02 May 2026 10:12:23 -0400
> > 
> > >> To reproduce:
> > >> 
> > >>   emacs -Q
> > >>   C-h f font-setting-change-default-font RET
> > >> 
> > >> This signals an error:
> > >> 
> > >>   user-error: Symbol’s function definition is void: font-setting-change-default-font
> > 
> > That sounds about right.  We could maybe change the `C-h f` code so it
> > catches the error and displays a *Help* buffer that basically says the
> > same as the error, but in any case, this seems like a very minor issue.
> 
> Can we do what happens when the symbol is not known to Emacs,
> i.e. ring the bell and say "[No match]" when the user presses RET?
> That's what I would expect to see in that case.

Or what about the following trick:

  . we add "autoload-compute-prefixes: nil" to file-local variables in
    dynamic-setting.el
  . we then modify this part in loadup.el:

       (if (featurep 'dynamic-setting)
           (load "dynamic-setting"))

    to say this:

       (when (featurep 'dynamic-setting)
         (register-definition-prefixes "dynamic-setting"
           '("dynamic-setting-handle-config-changed-event"
             "font-setting-change-default-font"))
         (load "dynamic-setting"))

Would that do the trick without any negative side-effects?
Information forwarded to bug-gnu-emacs@HIDDEN:
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Date: Sat, 02 May 2026 18:02:55 +0300
Message-Id: <86mryh97mo.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Stefan Monnier <monnier@HIDDEN>
In-Reply-To: <jwvcxzd2978.fsf-monnier+emacs@HIDDEN> (message from Stefan
 Monnier on Sat, 02 May 2026 10:12:23 -0400)
Subject: Re: bug#80873: 31.0.50; "C-h f" signals an error for
 font-setting-change-default-font
References: <86bjfcg98e.fsf@HIDDEN> <86a4ui9lsm.fsf@HIDDEN>
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> From: Stefan Monnier <monnier@HIDDEN>
> Cc: Po Lu <luangruo@HIDDEN>,  80873 <at> debbugs.gnu.org
> Date: Sat, 02 May 2026 10:12:23 -0400
> 
> >> To reproduce:
> >> 
> >>   emacs -Q
> >>   C-h f font-setting-change-default-font RET
> >> 
> >> This signals an error:
> >> 
> >>   user-error: Symbol’s function definition is void: font-setting-change-default-font
> 
> That sounds about right.  We could maybe change the `C-h f` code so it
> catches the error and displays a *Help* buffer that basically says the
> same as the error, but in any case, this seems like a very minor issue.

Can we do what happens when the symbol is not known to Emacs,
i.e. ring the bell and say "[No match]" when the user presses RET?
That's what I would expect to see in that case.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80873; Package emacs. Full text available.

Message received at 80873 <at> debbugs.gnu.org:


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From: Stefan Monnier <monnier@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#80873: 31.0.50; "C-h f" signals an error for
 font-setting-change-default-font
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>> To reproduce:
>>=20
>>   emacs -Q
>>   C-h f font-setting-change-default-font RET
>>=20
>> This signals an error:
>>=20
>>   user-error: Symbol=E2=80=99s function definition is void: font-setting=
-change-default-font

That sounds about right.  We could maybe change the `C-h f` code so it
catches the error and displays a *Help* buffer that basically says the
same as the error, but in any case, this seems like a very minor issue.


=3D=3D=3D Stefan
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80873; Package emacs. Full text available.

Message received at 80873 <at> debbugs.gnu.org:


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To: Po Lu <luangruo@HIDDEN>,
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In-Reply-To: <86bjfcg98e.fsf@HIDDEN> (message from Eli Zaretskii on Tue, 21
 Apr 2026 08:42:25 +0300)
Subject: Re: bug#80873: 31.0.50;
 "C-h f" signals an error for font-setting-change-default-font
References: <86bjfcg98e.fsf@HIDDEN>
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Ping!  Can we do something about this issue, please?

> Cc: Po Lu <luangruo@HIDDEN>, Stefan Monnier <monnier@HIDDEN>
> Date: Tue, 21 Apr 2026 08:42:25 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> 
> To reproduce:
> 
>   emacs -Q
>   C-h f font-setting-change-default-font RET
> 
> This signals an error:
> 
>   user-error: Symbol’s function definition is void: font-setting-change-default-font
> 
> AFAICT, this happens because loaddefs.el has the following:
> 
>   ;;; Generated autoloads from dynamic-setting.el
> 
>   (register-definition-prefixes "dynamic-setting" '("dynamic-setting-handle-config-changed-event" "font-setting-change-default-font"))
> 
> and loadup.el says:
> 
>   (if (featurep 'dynamic-setting)
>       (load "dynamic-setting"))
> 
> So dynamic-setting.el is preloaded on systems that have xsettings.c
> (which provides the 'dynamic-setting feature) compiled into Emacs, but
> on other systems (such as MS-Windows here) the function's symbol
> exists, but is void.
> 
> What can we do to avoid this?  I'd expect that function's symbol to
> not be known on systems that don't load dynamic-setting.el.  Can we do
> that?
> 
> In GNU Emacs 31.0.50 (build 2135, i686-pc-mingw32) of 2026-04-20 built
>  on ELIZ-PC
> Repository revision: b7eb715a134f2c98b9a358cebcc2c47832d212ae
> Repository branch: master
> Windowing system distributor 'Microsoft Corp.', version 10.0.26100
> System Description: Microsoft Windows 10 Enterprise (v10.0.2009.26100.8246)
> 
> Configured using:
>  'configure -C --prefix=/d/usr --with-wide-int
>  --without-native-compilation --enable-checking=yes,glyphs 'CFLAGS=-O0
>  -gdwarf-4 -g3''
> 
> Configured features:
> ACL GIF GMP GNUTLS HARFBUZZ JPEG LCMS2 LIBXML2 MODULES NOTIFY W32NOTIFY
> PDUMPER PNG RSVG SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
> TREE_SITTER WEBP XPM ZLIB
> 
> Important settings:
>   value of $LANG: ENG
>   locale-coding-system: cp1252
> 
> 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-nonselected-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 dabbrev emacsbug lisp-mnt 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 mule-util mm-decode mm-bodies mm-encode mailabbrev
> gmm-utils mailheader sendmail mail-parse rfc2231 rfc2047 rfc2045
> ietf-drums mm-util mail-prsvr mail-utils thingatpt help-fns radix-tree
> help-mode warnings icons cl-loaddefs cl-lib rmc iso-transl tooltip cconv
> eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type
> elisp-mode mwheel touch-screen dos-w32 ls-lisp term/w32-nt disp-table
> term/w32-win w32-win w32-vars term/common-win 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
> hashtable-print-readable backquote threads w32notify w32 lcms2 multi-tty
> move-toolbar make-network-process tty-child-frames emacs)
> 
> Memory information:
> ((conses 16 52248 18851) (symbols 48 7010 0) (strings 16 19766 2284)
>  (string-bytes 1 397506) (vectors 16 10332)
>  (vector-slots 8 122108 8288) (floats 8 25 8) (intervals 40 320 75)
>  (buffers 928 10))
> 
> 
> 
>
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#80873; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Eli Zaretskii <eliz@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 31.0.50; "C-h f" signals an error for font-setting-change-default-font
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From: eliz@HIDDEN
--text follows this line--
To reproduce:

  emacs -Q
  C-h f font-setting-change-default-font RET

This signals an error:

  user-error: Symbol’s function definition is void: font-setting-change-default-font

AFAICT, this happens because loaddefs.el has the following:

  ;;; Generated autoloads from dynamic-setting.el

  (register-definition-prefixes "dynamic-setting" '("dynamic-setting-handle-config-changed-event" "font-setting-change-default-font"))

and loadup.el says:

  (if (featurep 'dynamic-setting)
      (load "dynamic-setting"))

So dynamic-setting.el is preloaded on systems that have xsettings.c
(which provides the 'dynamic-setting feature) compiled into Emacs, but
on other systems (such as MS-Windows here) the function's symbol
exists, but is void.

What can we do to avoid this?  I'd expect that function's symbol to
not be known on systems that don't load dynamic-setting.el.  Can we do
that?

In GNU Emacs 31.0.50 (build 2135, i686-pc-mingw32) of 2026-04-20 built
 on ELIZ-PC
Repository revision: b7eb715a134f2c98b9a358cebcc2c47832d212ae
Repository branch: master
Windowing system distributor 'Microsoft Corp.', version 10.0.26100
System Description: Microsoft Windows 10 Enterprise (v10.0.2009.26100.8246)

Configured using:
 'configure -C --prefix=/d/usr --with-wide-int
 --without-native-compilation --enable-checking=yes,glyphs 'CFLAGS=-O0
 -gdwarf-4 -g3''

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG LCMS2 LIBXML2 MODULES NOTIFY W32NOTIFY
PDUMPER PNG RSVG SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
TREE_SITTER WEBP XPM ZLIB

Important settings:
  value of $LANG: ENG
  locale-coding-system: cp1252

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-nonselected-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 dabbrev emacsbug lisp-mnt 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 mule-util mm-decode mm-bodies mm-encode mailabbrev
gmm-utils mailheader sendmail mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mail-utils thingatpt help-fns radix-tree
help-mode warnings icons cl-loaddefs cl-lib rmc iso-transl tooltip cconv
eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type
elisp-mode mwheel touch-screen dos-w32 ls-lisp term/w32-nt disp-table
term/w32-win w32-win w32-vars term/common-win 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
hashtable-print-readable backquote threads w32notify w32 lcms2 multi-tty
move-toolbar make-network-process tty-child-frames emacs)

Memory information:
((conses 16 52248 18851) (symbols 48 7010 0) (strings 16 19766 2284)
 (string-bytes 1 397506) (vectors 16 10332)
 (vector-slots 8 122108 8288) (floats 8 25 8) (intervals 40 320 75)
 (buffers 928 10))
Acknowledgement sent to Eli Zaretskii <eliz@HIDDEN>:
New bug report received and forwarded. Copy sent to luangruo@HIDDEN, monnier@HIDDEN, bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to luangruo@HIDDEN, monnier@HIDDEN, bug-gnu-emacs@HIDDEN:
bug#80873; Package emacs. Full text available.
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Last modified: Wed, 6 May 2026 11:30:05 UTC

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