GNU bug report logs - #9858
24.0.90; M-x gdb breaks if gdb-show-main is non-nil but there's no file loaded

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

From: Ken Brown <kbrown <at> cornell.edu>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.0.90; M-x gdb breaks if gdb-show-main is non-nil but there's no
	file loaded
Date: Mon, 24 Oct 2011 12:10:04 -0400

The info node GDB Graphical Interface File > GDB User Interface Layout 
suggests setting the (customizable) variable gdb-show-main non-nil in 
order to have the source buffer displayed on startup of M-x gdb.  But if 
you do this and then run M-x gdb without specifying a file to debug, M-x 
gdb doesn't initialize properly, and the *Messages* buffer contains

error in process filter: gud-find-file: Wrong type argument: stringp, nil

I think M-x gdb should just start up normally in this situation, perhaps 
with a message that there's no source file.

To reproduce:

emacs -Q
M-: (setq gdb-show-main t) <ret>
M-x gdb <delete any file name in the prompt> <return>

In GNU Emacs 24.0.90.2 (x86_64-unknown-linux-gnu, GTK+ Version 2.22.0)
 of 2011-10-24 on moufangfedora
Windowing system distributor `Fedora Project', version 11.0.10905000
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  value of $XMODIFIERS: @im=none
  locale-coding-system: nil
  default enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  tooltip-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

Recent input:
M-x s e t - v a <tab> <return> g d b - s h o w - m
a i n <return> C-g M-: ( s e t q SPC g d b - s h o
w - m a i n SPC t ) <return> M-x g d b <return> <M-backspace>
<M-backspace> <return> C-x b * M <tab> <return> M-x
r e p o r <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Quit
t
error in process filter: gud-find-file: Wrong type argument: stringp, nil
error in process filter: Wrong type argument: stringp, nil

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr message format-spec rfc822 mml easymenu
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mailabbrev mail-utils gmm-utils mailheader
emacsbug gdb-mi bindat json gud easy-mmode comint regexp-opt ring
help-fns time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel
x-win x-dnd tool-bar dnd fontset image fringe lisp-mode register page
menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core frame cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer loaddefs
button faces cus-face files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty emacs)

Message #8 received at 9858 <at> debbugs.gnu.org (full text, mbox):

From: Ken Brown <kbrown <at> cornell.edu>
To: 9858 <at> debbugs.gnu.org
Subject: Re: bug#9858: 24.0.90; M-x gdb breaks if gdb-show-main is non-nil
	but there's no file loaded
Date: Mon, 24 Oct 2011 15:23:52 -0400

On 10/24/2011 12:10 PM, Ken Brown wrote:
> The info node GDB Graphical Interface File > GDB User Interface Layout
> suggests setting the (customizable) variable gdb-show-main non-nil in
> order to have the source buffer displayed on startup of M-x gdb. But if
> you do this and then run M-x gdb without specifying a file to debug, M-x
> gdb doesn't initialize properly, and the *Messages* buffer contains
>
> error in process filter: gud-find-file: Wrong type argument: stringp, nil

The following patch seems to fix it.  OK to apply?

=== modified file 'lisp/progmodes/gdb-mi.el'
--- lisp/progmodes/gdb-mi.el    2011-10-06 16:11:38 +0000
+++ lisp/progmodes/gdb-mi.el    2011-10-24 19:17:07 +0000
@@ -4121,7 +4121,7 @@
   (if gdb-many-windows
       (gdb-setup-windows)
     (gdb-get-buffer-create 'gdb-breakpoints-buffer)
-    (if gdb-show-main
+    (if (and gdb-show-main gdb-main-file)
         (let ((pop-up-windows t))
           (display-buffer (gud-find-file gdb-main-file))))))

Message #13 received at 9858-done <at> debbugs.gnu.org (full text, mbox):

From: Ken Brown <kbrown <at> cornell.edu>
To: 9858-done <at> debbugs.gnu.org
Subject: Re: bug#9858: 24.0.90; M-x gdb breaks if gdb-show-main is non-nil
	but there's no file loaded
Date: Tue, 29 Nov 2011 22:28:40 -0500

On 10/24/2011 3:23 PM, Ken Brown wrote:
> The following patch seems to fix it. OK to apply?

Patch applied.  Closing bug.

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