bug#22772: 25.0.91; Can't run gud-gdb on two instances of the same program

[Michael Welsh Duggan <mwd@cert.org>]

I was in a circumstance where I wanted to run a debugger on two
instances of the same program, one compiled with one set of options, and
one compiled with another.  I wanted to compare how they ran in certain
parts of the code.  I use M-x gud-gdb, since the MI client doesn't
support multipl debugger instances (which is sad).

This fails, though, since I get the error:

  gud-common-init: This program is already being debugged

These programs are installed in different directories, but have the same
filename.  I can work around this problem by renaming one of the
executables, but I think this is a bug, since the path to the executable
could be used to determine uniqueness instead of the filename itself.


In GNU Emacs 25.0.91.1 (x86_64-unknown-linux-gnu, X toolkit)
 of 2016-02-16 built on watermonitor.yellow.cert.org
Repository revision: b1a3ebedba88689d26f44cf7db338104b849ae99
Windowing system distributor 'Red Hat, Inc.', version 11.0.11500000
System Description:	Red Hat Enterprise Linux Server release 6.7 (Santiago)

Configured using:
 'configure --without-toolkit-scroll-bars --with-x-toolkit=lucid
 --with-wide-int --prefix=/home/mwd
 PKG_CONFIG_PATH=/home/mwd/lib/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig'

Configured features:
XPM JPEG TIFF GIF PNG IMAGEMAGICK SOUND GPM DBUS NOTIFY LIBSELINUX
GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB LUCID X11

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

Major mode: Group

Minor modes in effect:
  gnus-topic-mode: t
  gnus-undo-mode: t
  shell-dirtrack-mode: t
  display-time-mode: t
  diff-auto-refine-mode: t
  tooltip-mode: t
  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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t

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/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/nnagent hides /home/mwd/share/emacs/25.0.91/lisp/gnus/nnagent
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/gnus-draft hides /home/mwd/share/emacs/25.0.91/lisp/gnus/gnus-draft
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/gnus-uu hides /home/mwd/share/emacs/25.0.91/lisp/gnus/gnus-uu
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/gnus-cloud hides /home/mwd/share/emacs/25.0.91/lisp/gnus/gnus-cloud
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/gnus-bookmark hides /home/mwd/share/emacs/25.0.91/lisp/gnus/gnus-bookmark
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/gnus-win hides /home/mwd/share/emacs/25.0.91/lisp/gnus/gnus-win
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/gnus-msg hides /home/mwd/share/emacs/25.0.91/lisp/gnus/gnus-msg
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/mm-url hides /home/mwd/share/emacs/25.0.91/lisp/gnus/mm-url
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/nneething hides /home/mwd/share/emacs/25.0.91/lisp/gnus/nneething
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/html2text hides /home/mwd/share/emacs/25.0.91/lisp/gnus/html2text
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/nnnil hides /home/mwd/share/emacs/25.0.91/lisp/gnus/nnnil
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/mml-sec hides /home/mwd/share/emacs/25.0.91/lisp/gnus/mml-sec
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/compface hides /home/mwd/share/emacs/25.0.91/lisp/gnus/compface
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/gnus-eform hides /home/mwd/share/emacs/25.0.91/lisp/gnus/gnus-eform
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/gnus-topic hides /home/mwd/share/emacs/25.0.91/lisp/gnus/gnus-topic
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/gnus-agent hides /home/mwd/share/emacs/25.0.91/lisp/gnus/gnus-agent
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/nndoc hides /home/mwd/share/emacs/25.0.91/lisp/gnus/nndoc
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/gnus-dired hides /home/mwd/share/emacs/25.0.91/lisp/gnus/gnus-dired
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/nnmbox hides /home/mwd/share/emacs/25.0.91/lisp/gnus/nnmbox
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/spam-report hides /home/mwd/share/emacs/25.0.91/lisp/gnus/spam-report
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/gnus-vm hides /home/mwd/share/emacs/25.0.91/lisp/gnus/gnus-vm
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/gnus-kill hides /home/mwd/share/emacs/25.0.91/lisp/gnus/gnus-kill
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/gnus-cite hides /home/mwd/share/emacs/25.0.91/lisp/gnus/gnus-cite
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/nnweb hides /home/mwd/share/emacs/25.0.91/lisp/gnus/nnweb
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/nnfolder hides /home/mwd/share/emacs/25.0.91/lisp/gnus/nnfolder
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/parse-time hides /home/mwd/share/emacs/25.0.91/lisp/calendar/parse-time
/afs/cert.org/usr/mwd/src/elisp/gnus/lisp/time-date hides /home/mwd/share/emacs/25.0.91/lisp/calendar/time-date

Features:
(shadow flyspell ispell emacsbug flow-fill gnus-dup browse-url sort
gnus-cite mm-archive mail-extr gnus-bcklg qp copyright gnus-async
gnus-ml disp-table gnus-topic utf-7 nndraft nnmh epa-file epa derived
epg network-stream nsm starttls gnus-agent gnus-srvr gnus-score
score-mode nnvirtual gnus-msg gnus-art mm-uu mml2015 mm-view mml-smime
gnus-cache nnir edmacro gnus-sum gnus-demon nntp gnus-group gnus-undo
gnutls gnus-start gnus-cloud nnimap nnmail mail-source tls utf7 netrc
nnoo parse-time gnus-spec gnus-int gnus-range gnus-win gnus-load
yaml-mode woman man tramp tramp-compat tramp-loaddefs trampver
ucs-normalize shell time smime dig server whitespace psvn advice cl
log-edit pcvs-util add-log diff-mode org-clock org org-macro
org-footnote org-pcomplete pcomplete org-list org-faces org-entities
noutline outline easy-mmode org-version ob-emacs-lisp ob ob-tangle
ob-ref ob-lob ob-table ob-exp org-src ob-keys ob-comint comint
ansi-color ring ob-core ob-eval org-compat org-macs org-loaddefs
find-func eudcb-ldap eudc cus-edit cus-start cus-load eudc-vars ldap
message sendmail format-spec rfc822 mml mml-sec mm-decode mm-bodies
mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mailabbrev
gmm-utils mailheader gnus gnus-ems gnus-compat url url-proxy url-privacy
url-expand url-methods url-history url-cookie url-domsuf url-util
url-parse auth-source eieio-compat eieio byte-opt bytecomp byte-compile
cl-extra cconv eieio-core cl-macs gv password-cache url-vars mailcap
nnheader gnus-util time-date mail-utils mm-util help-fns help-mode
mail-prsvr wid-edit generic-x generated dired-x dired cc-styles cc-align
cc-engine cc-vars cc-defs cal-china lunar solar cal-dst cal-bahai
cal-islam cal-hebrew holidays hol-loaddefs appt diary-lib diary-loaddefs
cal-menu calendar cal-loaddefs bm info cl-seq kmacro cl-loaddefs pcase
cl-lib finder-inf debbugs-autoloads undo-tree-autoloads package easymenu
epg-config mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel x-win term/common-win x-dnd tool-bar dnd fontset
image regexp-opt fringe tabulated-list newcomment elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cl-generic 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 charscript case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer cl-preloaded nadvice
loaddefs button faces cus-face macroexp files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote dbusbind inotify dynamic-setting
font-render-setting x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 488026 38328)
 (symbols 48 43173 0)
 (miscs 40 181 439)
 (strings 32 87401 9722)
 (string-bytes 1 2903805)
 (vectors 16 57709)
 (vector-slots 8 951840 22039)
 (floats 8 983 407)
 (intervals 56 578 0)
 (buffers 976 69)
 (heap 1024 54057 33604))

-- 
Michael Welsh Duggan
(mwd@cert.org)