GNU bug report logs - #24128
25.1; Strange warning from byte compiler in gud.el and gdb-mi.el

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

From: Eli Zaretskii <eliz <at> gnu.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.1; Strange warning from byte compiler in gud.el and gdb-mi.el
Date: Mon, 01 Aug 2016 23:04:07 +0300

When these two files are compiled, the byte compiler emits strange
warnings:

    ELC      progmodes/gdb-mi.elc

  In toplevel form:
  progmodes/gdb-mi.el:675:1:Warning: Unused lexical argument `arg'

    ELC      progmodes/gud.elc

  In toplevel form:
  progmodes/gud.el:735:1:Warning: Unused lexical argument `arg'

But there's no "arg" anywhere in sight on those lines, which are
these:

(defun gdb (command-line)
(defun gud-gdb (command-line)

What is going on here?

In GNU Emacs 25.1.7 (i686-pc-mingw32)
 of 2016-08-01 built on HOME-C4E4A596F7
Repository revision: aa4271ab7299c033760db64bf15476a5e0eee2a5
Windowing system distributor 'Microsoft Corp.', version 5.1.2600
Configured using:
 'configure --prefix=/d/usr --enable-checking=yes,glyphs --with-wide-int
 --with-modules 'CFLAGS=-O0 -gdwarf-4 -g3''

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS MODULES

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1255

Major mode: Lisp Interaction

Minor modes in effect:
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  global-eldoc-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

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Memory information:
((conses 16 93412 6661)
 (symbols 56 20753 0)
 (miscs 48 46 107)
 (strings 16 17771 6169)
 (string-bytes 1 441590)
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Message #8 received at 24128 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 24128 <at> debbugs.gnu.org
Subject: Re: bug#24128: 25.1;
 Strange warning from byte compiler in gud.el and gdb-mi.el
Date: Mon, 01 Aug 2016 22:34:26 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>   progmodes/gud.el:735:1:Warning: Unused lexical argument `arg'

  (gud-def gud-jump
	   (progn (gud-call "tbreak %f:%l") (gud-call "jump %f:%l"))
	   "\C-j" "Set execution address to current line.")

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Message #11 received at 24128 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 24128 <at> debbugs.gnu.org
Subject: Re: bug#24128: 25.1;
 Strange warning from byte compiler in gud.el and gdb-mi.el
Date: Mon, 01 Aug 2016 22:37:39 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

> When these two files are compiled, the byte compiler emits strange
> warnings:
>
>     ELC      progmodes/gdb-mi.elc
>
>   In toplevel form:
>   progmodes/gdb-mi.el:675:1:Warning: Unused lexical argument `arg'
>
>     ELC      progmodes/gud.elc
>
>   In toplevel form:
>   progmodes/gud.el:735:1:Warning: Unused lexical argument `arg'
>

> What is going on here?

I think the warnings come from compiling some lambda created by the
macro `gud-def', and the determined positions are just incorrect.


Michael.

Message #14 received at 24128 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: 24128 <at> debbugs.gnu.org
Subject: Re: bug#24128: 25.1;
 Strange warning from byte compiler in gud.el and gdb-mi.el
Date: Tue, 02 Aug 2016 05:35:08 +0300

> From: Michael Heerdegen <michael_heerdegen <at> web.de>
> Cc: 24128 <at> debbugs.gnu.org
> Date: Mon, 01 Aug 2016 22:37:39 +0200
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > When these two files are compiled, the byte compiler emits strange
> > warnings:
> >
> >     ELC      progmodes/gdb-mi.elc
> >
> >   In toplevel form:
> >   progmodes/gdb-mi.el:675:1:Warning: Unused lexical argument `arg'
> >
> >     ELC      progmodes/gud.elc
> >
> >   In toplevel form:
> >   progmodes/gud.el:735:1:Warning: Unused lexical argument `arg'
> >
> 
> > What is going on here?
> 
> I think the warnings come from compiling some lambda created by the
> macro `gud-def', and the determined positions are just incorrect.

We should make the reported line correct, then.  Right?

Message #17 received at 24128 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 24128 <at> debbugs.gnu.org
Subject: Re: bug#24128: 25.1;
 Strange warning from byte compiler in gud.el and gdb-mi.el
Date: Tue, 02 Aug 2016 05:25:48 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

> We should make the reported line correct, then.  Right?

Seems the reported line number names the start of the according
top-level defun.  I wonder whether the compiler code knows at all to
which line the reported warning exactly refers (I don't know, but
somewhat doubt it).  Maybe someone else can help more.


Michael.

Message #20 received at 24128 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> users.sourceforge.net>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 24128 <at> debbugs.gnu.org
Subject: Re: bug#24128: 25.1;
 Strange warning from byte compiler in gud.el and gdb-mi.el
Date: Mon, 1 Aug 2016 23:48:59 -0400

On Mon, Aug 1, 2016 at 11:25 PM, Michael Heerdegen
<michael_heerdegen <at> web.de> wrote:
> Eli Zaretskii <eliz <at> gnu.org> writes:
>
>> We should make the reported line correct, then.  Right?
>
> Seems the reported line number names the start of the according
> top-level defun.  I wonder whether the compiler code knows at all to
> which line the reported warning exactly refers (I don't know, but
> somewhat doubt it).  Maybe someone else can help more.
>

It's a fairly long-standing bug, see
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=2681 and merged bugs.

Message #23 received at 24128 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Noam Postavsky <npostavs <at> users.sourceforge.net>
Cc: michael_heerdegen <at> web.de, 24128 <at> debbugs.gnu.org
Subject: Re: bug#24128: 25.1;
 Strange warning from byte compiler in gud.el and gdb-mi.el
Date: Tue, 02 Aug 2016 17:50:17 +0300

> From: Noam Postavsky <npostavs <at> users.sourceforge.net>
> Date: Mon, 1 Aug 2016 23:48:59 -0400
> Cc: Eli Zaretskii <eliz <at> gnu.org>, 24128 <at> debbugs.gnu.org
> 
> On Mon, Aug 1, 2016 at 11:25 PM, Michael Heerdegen
> <michael_heerdegen <at> web.de> wrote:
> > Eli Zaretskii <eliz <at> gnu.org> writes:
> >
> >> We should make the reported line correct, then.  Right?
> >
> > Seems the reported line number names the start of the according
> > top-level defun.  I wonder whether the compiler code knows at all to
> > which line the reported warning exactly refers (I don't know, but
> > somewhat doubt it).  Maybe someone else can help more.
> >
> 
> It's a fairly long-standing bug, see
> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=2681 and merged bugs.

So it's high time we had it fixed, IMO.

Thanks.

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