bug#40271: 26.3; gdb-mode fails to initialize if the target executable is built without symbols

bug#40271: 26.3; gdb-mode fails to initialize if the target executable is built without symbols

[Vladimir Nikishkin]

The way to reproduce would be the following:
1)printf "program main\nend" > test.f90
2)gfortran test.f90
3)emacs -q
4)M-: (setq gdb-many-windows t) RET
5)gdb RET a.out RET

Observe that gdb-mode fails to initialize. This happens because in
gdb-mi.el.gz, line 4689, gdb-main-file gets a completely unrelated .S
file name relative to the directory where distro authors compile glibc.
I think that the regular expression search should rather fail in this
case, but am not very sure.

I think this bug manifestation if distro-dependent. 

In GNU Emacs 26.3 (build 1, x86_64-slackware-linux-gnu, GTK+ Version 3.24.12)
 of 2019-11-26 built on hive64.slackware.lan
Windowing system distributor 'The X.Org Foundation', version 11.0.12007000
System Description:	Slackware Linux 

Recent messages:
Compilation finished
error in process filter: let: Wrong type argument: stringp, nil
error in process filter: Wrong type argument: stringp, nil
WARNING! Discarding GDB handler with token #6

Target doesn’t support non-stop mode.  Turning it off.
Compilation finished
gud-common-init: This program is already being debugged
Target doesn’t support non-stop mode.  Turning it off.
Making completion list...

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var
--program-prefix= --program-suffix= --mandir=/usr/man
--infodir=/usr/info --without-gconf --without-gsettings --with-modules
--with-x --with-x-toolkit=gtk3 --build=x86_64-slackware-linux
'CFLAGS=-O2 -fPIC''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GLIB NOTIFY ACL
GNUTLS LIBXML2 FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM
MODULES THREADS LCMS2

Important settings:
  value of $LC_COLLATE: C
  value of $LC_TIME: en_GB.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=SCIM
  locale-coding-system: utf-8-unix

Major mode: Debugger

Minor modes in effect:
  gdb-many-windows: t
  global-flycheck-mode: t
  auto-insert-mode: t
  ido-everywhere: t
  TeX-PDF-mode: t
  TeX-source-correlate-mode: t
  global-auto-revert-mode: t
  electric-pair-mode: t
  global-display-line-numbers-mode: t
  display-line-numbers-mode: t
  global-hi-lock-mode: t
  hi-lock-mode: t
  shell-dirtrack-mode: t
  global-company-mode: t
  company-mode: t
  global-srecode-minor-mode: t
  global-ede-mode: t
  global-semanticdb-minor-mode: t
  global-semantic-decoration-mode: t
  global-semantic-mru-bookmark-mode: t
  global-semantic-idle-completions-mode: t
  global-semantic-idle-scheduler-mode: t
  global-semantic-idle-summary-mode: t
  global-semantic-highlight-func-mode: t
  global-semantic-stickyfunc-mode: t
  semantic-mode: t
  savehist-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-layout-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  global-prettify-symbols-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
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-save-visited-mode: t
  abbrev-mode: t

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/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-macs hides /home/lockywolf/.emacs.d/elpa/org-20200210/org-macs
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-plot hides /home/lockywolf/.emacs.d/elpa/org-20200210/org-plot
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ox-odt hides /home/lockywolf/.emacs.d/elpa/org-20200210/ox-odt
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-emacs-lisp hides /home/lockywolf/.emacs.d/elpa/org-20200210/ob-emacs-lisp
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-footnote hides /home/lockywolf/.emacs.d/elpa/org-20200210/org-footnote
/home/lockywolf/.emacs.d/elpa/company-cmake-0.1/company-cmake hides /home/lockywolf/.emacs.d/elpa/company-20200206.2239/company-cmake
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ox hides /usr/share/emacs/26.3/lisp/org/ox
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ox-texinfo hides /usr/share/emacs/26.3/lisp/org/ox-texinfo
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ox-publish hides /usr/share/emacs/26.3/lisp/org/ox-publish
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ox-org hides /usr/share/emacs/26.3/lisp/org/ox-org
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ox-odt hides /usr/share/emacs/26.3/lisp/org/ox-odt
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ox-md hides /usr/share/emacs/26.3/lisp/org/ox-md
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ox-man hides /usr/share/emacs/26.3/lisp/org/ox-man
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ox-icalendar hides /usr/share/emacs/26.3/lisp/org/ox-icalendar
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ox-html hides /usr/share/emacs/26.3/lisp/org/ox-html
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ox-ascii hides /usr/share/emacs/26.3/lisp/org/ox-ascii
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-timer hides /usr/share/emacs/26.3/lisp/org/org-timer
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-table hides /usr/share/emacs/26.3/lisp/org/org-table
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-scheme hides /usr/share/emacs/26.3/lisp/org/ob-scheme
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ox-latex hides /usr/share/emacs/26.3/lisp/org/ox-latex
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ox-beamer hides /usr/share/emacs/26.3/lisp/org/ox-beamer
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org hides /usr/share/emacs/26.3/lisp/org/org
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-version hides /usr/share/emacs/26.3/lisp/org/org-version
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-src hides /usr/share/emacs/26.3/lisp/org/org-src
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-protocol hides /usr/share/emacs/26.3/lisp/org/org-protocol
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-plot hides /usr/share/emacs/26.3/lisp/org/org-plot
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-pcomplete hides /usr/share/emacs/26.3/lisp/org/org-pcomplete
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-mouse hides /usr/share/emacs/26.3/lisp/org/org-mouse
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-mobile hides /usr/share/emacs/26.3/lisp/org/org-mobile
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-macs hides /usr/share/emacs/26.3/lisp/org/org-macs
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-macro hides /usr/share/emacs/26.3/lisp/org/org-macro
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-loaddefs hides /usr/share/emacs/26.3/lisp/org/org-loaddefs
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-list hides /usr/share/emacs/26.3/lisp/org/org-list
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-lint hides /usr/share/emacs/26.3/lisp/org/org-lint
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-install hides /usr/share/emacs/26.3/lisp/org/org-install
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-inlinetask hides /usr/share/emacs/26.3/lisp/org/org-inlinetask
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-indent hides /usr/share/emacs/26.3/lisp/org/org-indent
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-id hides /usr/share/emacs/26.3/lisp/org/org-id
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-habit hides /usr/share/emacs/26.3/lisp/org/org-habit
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-footnote hides /usr/share/emacs/26.3/lisp/org/org-footnote
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-feed hides /usr/share/emacs/26.3/lisp/org/org-feed
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-faces hides /usr/share/emacs/26.3/lisp/org/org-faces
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-entities hides /usr/share/emacs/26.3/lisp/org/org-entities
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-element hides /usr/share/emacs/26.3/lisp/org/org-element
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-duration hides /usr/share/emacs/26.3/lisp/org/org-duration
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-datetree hides /usr/share/emacs/26.3/lisp/org/org-datetree
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-ctags hides /usr/share/emacs/26.3/lisp/org/org-ctags
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-crypt hides /usr/share/emacs/26.3/lisp/org/org-crypt
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-compat hides /usr/share/emacs/26.3/lisp/org/org-compat
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-colview hides /usr/share/emacs/26.3/lisp/org/org-colview
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-clock hides /usr/share/emacs/26.3/lisp/org/org-clock
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-capture hides /usr/share/emacs/26.3/lisp/org/org-capture
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-attach hides /usr/share/emacs/26.3/lisp/org/org-attach
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-archive hides /usr/share/emacs/26.3/lisp/org/org-archive
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/org-agenda hides /usr/share/emacs/26.3/lisp/org/org-agenda
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob hides /usr/share/emacs/26.3/lisp/org/ob
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-vala hides /usr/share/emacs/26.3/lisp/org/ob-vala
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-tangle hides /usr/share/emacs/26.3/lisp/org/ob-tangle
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-table hides /usr/share/emacs/26.3/lisp/org/ob-table
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-stan hides /usr/share/emacs/26.3/lisp/org/ob-stan
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-sqlite hides /usr/share/emacs/26.3/lisp/org/ob-sqlite
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-sql hides /usr/share/emacs/26.3/lisp/org/ob-sql
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-shen hides /usr/share/emacs/26.3/lisp/org/ob-shen
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-shell hides /usr/share/emacs/26.3/lisp/org/ob-shell
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-sed hides /usr/share/emacs/26.3/lisp/org/ob-sed
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-screen hides /usr/share/emacs/26.3/lisp/org/ob-screen
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-sass hides /usr/share/emacs/26.3/lisp/org/ob-sass
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-ruby hides /usr/share/emacs/26.3/lisp/org/ob-ruby
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-ref hides /usr/share/emacs/26.3/lisp/org/ob-ref
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-python hides /usr/share/emacs/26.3/lisp/org/ob-python
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-processing hides /usr/share/emacs/26.3/lisp/org/ob-processing
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-plantuml hides /usr/share/emacs/26.3/lisp/org/ob-plantuml
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-picolisp hides /usr/share/emacs/26.3/lisp/org/ob-picolisp
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-perl hides /usr/share/emacs/26.3/lisp/org/ob-perl
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-org hides /usr/share/emacs/26.3/lisp/org/ob-org
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-octave hides /usr/share/emacs/26.3/lisp/org/ob-octave
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-ocaml hides /usr/share/emacs/26.3/lisp/org/ob-ocaml
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-mscgen hides /usr/share/emacs/26.3/lisp/org/ob-mscgen
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-maxima hides /usr/share/emacs/26.3/lisp/org/ob-maxima
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-matlab hides /usr/share/emacs/26.3/lisp/org/ob-matlab
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-makefile hides /usr/share/emacs/26.3/lisp/org/ob-makefile
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-lua hides /usr/share/emacs/26.3/lisp/org/ob-lua
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-lob hides /usr/share/emacs/26.3/lisp/org/ob-lob
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-lisp hides /usr/share/emacs/26.3/lisp/org/ob-lisp
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-lilypond hides /usr/share/emacs/26.3/lisp/org/ob-lilypond
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-ledger hides /usr/share/emacs/26.3/lisp/org/ob-ledger
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-latex hides /usr/share/emacs/26.3/lisp/org/ob-latex
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-js hides /usr/share/emacs/26.3/lisp/org/ob-js
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-java hides /usr/share/emacs/26.3/lisp/org/ob-java
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-io hides /usr/share/emacs/26.3/lisp/org/ob-io
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-hledger hides /usr/share/emacs/26.3/lisp/org/ob-hledger
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-haskell hides /usr/share/emacs/26.3/lisp/org/ob-haskell
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-groovy hides /usr/share/emacs/26.3/lisp/org/ob-groovy
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-gnuplot hides /usr/share/emacs/26.3/lisp/org/ob-gnuplot
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-fortran hides /usr/share/emacs/26.3/lisp/org/ob-fortran
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-forth hides /usr/share/emacs/26.3/lisp/org/ob-forth
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-exp hides /usr/share/emacs/26.3/lisp/org/ob-exp
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-eval hides /usr/share/emacs/26.3/lisp/org/ob-eval
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-emacs-lisp hides /usr/share/emacs/26.3/lisp/org/ob-emacs-lisp
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-ebnf hides /usr/share/emacs/26.3/lisp/org/ob-ebnf
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-dot hides /usr/share/emacs/26.3/lisp/org/ob-dot
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-ditaa hides /usr/share/emacs/26.3/lisp/org/ob-ditaa
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-css hides /usr/share/emacs/26.3/lisp/org/ob-css
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-core hides /usr/share/emacs/26.3/lisp/org/ob-core
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-coq hides /usr/share/emacs/26.3/lisp/org/ob-coq
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-comint hides /usr/share/emacs/26.3/lisp/org/ob-comint
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-clojure hides /usr/share/emacs/26.3/lisp/org/ob-clojure
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-calc hides /usr/share/emacs/26.3/lisp/org/ob-calc
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-awk hides /usr/share/emacs/26.3/lisp/org/ob-awk
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-asymptote hides /usr/share/emacs/26.3/lisp/org/ob-asymptote
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-abc hides /usr/share/emacs/26.3/lisp/org/ob-abc
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-R hides /usr/share/emacs/26.3/lisp/org/ob-R
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-J hides /usr/share/emacs/26.3/lisp/org/ob-J
/home/lockywolf/.emacs.d/elpa/org-plus-contrib-20200210/ob-C hides /usr/share/emacs/26.3/lisp/org/ob-C

Features:
(shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs
rfc822 mml mml-sec epa epg gnus-util rmail rmail-loaddefs mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
gdb-mi derived bindat gud jka-compr semantic/db-file data-debug
cedet-files f90 form-feed flyspell company-oddmuse company-keywords
company-etags company-gtags company-dabbrev-code company-dabbrev
company-files company-capf company-cmake company-xcode company-clang
company-semantic company-eclim company-template company-bbdb
flycheck-plantuml plantuml-mode flycheck-clang-analyzer flycheck
cl-extra rx subr-x dash autoinsert ispell ido auctex-latexmk tex-buf
latex latex-flymake flymake-proc flymake warnings tex-ispell tex-style
tex crm reftex reftex-loaddefs reftex-vars smtpmail sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils starttls autorevert
filenotify prettify-greek elec-pair keywiz gamegrid display-line-numbers
hi-lock org-tempo tempo secrets dbus xml ox-org ox-md ox-odt rng-loc
rng-uri rng-parse rng-match rng-dt rng-util rng-pttrn nxml-parse nxml-ns
nxml-enc xmltok nxml-util ox-latex ox-icalendar ox-html table ox-ascii
ox-publish ox org-element avl-tree generator ob-shell shell ob-latex
ob-scheme geiser-impl help-fns radix-tree help-mode geiser-custom
geiser-base ob-C ob-plantuml org-protocol org ob ob-tangle ob-ref ob-lob
ob-table ob-exp org-macro org-footnote org-src ob-comint org-pcomplete
pcomplete org-list org-faces org-entities foldout noutline outline
easy-mmode org-version ob-emacs-lisp ob-core ob-eval org-table ol
org-keys org-compat advice org-macs org-loaddefs format-spec cal-menu
calendar cal-loaddefs mic-paren ffap thingatpt paredit-menu paredit
geiser manoj-dark-theme company pcase edmacro kmacro ggtags compile
comint ansi-color ewoc function-args json map semantic-directory
semantic/ia ivy delsel colir color ivy-overlay etags xref project
srecode/mode semantic/senator semantic/wisent semantic/wisent/wisent
srecode/insert srecode/filters srecode/args ede/speedbar ede/files ede
ede/detect ede/base ede/auto ede/source eieio-speedbar speedbar sb-image
dframe eieio-custom srecode/find srecode/map srecode/ctxt
srecode/compile srecode/dictionary srecode/table srecode
semantic/db-mode semantic/bovine/c hideif cc-mode cc-fonts cc-guess
cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs
semantic/bovine/c-by semantic/lex-spp semantic/bovine/gcc semantic/dep
semantic/bovine semantic/analyze/refs semantic/db-find semantic/db-ref
semantic/analyze semantic/sort semantic/scope semantic/analyze/fcn
semantic/db semantic/decorate/mode semantic/decorate pulse
semantic/mru-bookmark ring eieio-base semantic/idle semantic/format
ezimage semantic/tag-ls semantic/find semantic/ctxt semantic/util-modes
semantic/util semantic semantic/tag semantic/lex semantic/fw mode-local
find-func cedet hamburger-menu tmm savehist cus-edit wid-edit cus-start
cus-load server finder-inf tex-site gh-common marshal eieio-compat
org2blog-autoloads slime-autoloads w3m-load info package easymenu
epg-config url-handlers url-parse auth-source cl-seq eieio eieio-core
cl-macs eieio-loaddefs password-cache url-vars seq byte-opt gv bytecomp
byte-compile cconv cl-loaddefs cl-lib time-date mule-util tooltip eldoc
electric uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win
x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors 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 composite charscript charprop case-table epa-hook jka-cmpr-hook
help simple abbrev obarray 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 threads dbusbind inotify lcms2 dynamic-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 528312 25491)
 (symbols 48 57385 1)
 (miscs 40 4309 418)
 (strings 32 180098 7607)
 (string-bytes 1 5345751)
 (vectors 16 63202)
 (vector-slots 8 1216261 20348)
 (floats 8 390 466)
 (intervals 56 699 127)
 (buffers 992 24))

-- 
--
Vladimir Nikishkin (MiEr, lockywolf)

bug#40271: 26.3; gdb-mode fails to initialize if the target executable is built without symbols

[Eli Zaretskii]

> From: Vladimir Nikishkin <lockywolf@gmail.com>
> Date: Sat, 28 Mar 2020 19:51:40 +0800
> 
> The way to reproduce would be the following:
> 1)printf "program main\nend" > test.f90
> 2)gfortran test.f90
> 3)emacs -q
> 4)M-: (setq gdb-many-windows t) RET
> 5)gdb RET a.out RET
> 
> Observe that gdb-mode fails to initialize.

I cannot reproduce this on my system, debugging one of the programs in
the public /usr/bin/ directory (which are all stripped of the
debugging symbols).

> This happens because in gdb-mi.el.gz, line 4689, gdb-main-file gets
> a completely unrelated .S file name relative to the directory where
> distro authors compile glibc.

Please show all the related details (what regexp search fails, what
does it find, and what it ought to find instead), since otherwise it
will be very hard to fix this problem.

bug#40271: 26.3; gdb-mode fails to initialize if the target executable is built without symbols

[Eli Zaretskii]

> Date: Sat, 28 Mar 2020 15:11:27 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 40271@debbugs.gnu.org
> 
> > From: Vladimir Nikishkin <lockywolf@gmail.com>
> > Date: Sat, 28 Mar 2020 19:51:40 +0800
> > 
> > The way to reproduce would be the following:
> > 1)printf "program main\nend" > test.f90
> > 2)gfortran test.f90
> > 3)emacs -q
> > 4)M-: (setq gdb-many-windows t) RET
> > 5)gdb RET a.out RET
> > 
> > Observe that gdb-mode fails to initialize.
> 
> I cannot reproduce this on my system, debugging one of the programs in
> the public /usr/bin/ directory (which are all stripped of the
> debugging symbols).
> 
> > This happens because in gdb-mi.el.gz, line 4689, gdb-main-file gets
> > a completely unrelated .S file name relative to the directory where
> > distro authors compile glibc.
> 
> Please show all the related details (what regexp search fails, what
> does it find, and what it ought to find instead), since otherwise it
> will be very hard to fix this problem.

Also, if you start GDB from the shell prompt, like this:

  $ gdb -i=mi ./a.out

and then issue the -file-list-exec-source-file command, what do you
see?

bug#40271: Fwd: bug#40271: 26.3; gdb-mode fails to initialize if the target executable is built without symbols

[Vladimir Nikishkin]

---------- Forwarded message ---------
От: Vladimir Nikishkin <lockywolf@gmail.com>
Date: сб, 28 мар. 2020 г. в 20:38
Subject: Re: bug#40271: 26.3; gdb-mode fails to initialize if the
target executable is built without symbols
To: Eli Zaretskii <eliz@gnu.org>


I am not super sure how to debug this.

Firsly, regarding your question:

lockywolf@delllaptop:~/DevLinux/chibi-sicp$ gdb -i=mi a.out
=thread-group-added,id="i1"
~"GNU gdb (GDB) 9.1\n"
~"Copyright (C) 2020 Free Software Foundation, Inc.\n"
~"License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>\nThis is free software: you are
free to change and redistribute it.\nThere is NO WARRANTY, to the
extent permitted by law."
~"\nType \"show copying\" and \"show warranty\" for details.\n"
~"This GDB was configured as \"x86_64-slackware-linux\".\n"
~"Type \"show configuration\" for configuration details.\n"
~"For bug reporting instructions, please see:\n"
~"<http://www.gnu.org/software/gdb/bugs/>.\n"
~"Find the GDB manual and other documentation resources online at:\n
 <http://www.gnu.org/software/gdb/documentation/>."
~"\n\n"
~"For help, type \"help\".\n"
~"Type \"apropos word\" to search for commands related to \"word\"...\n"
=cmd-param-changed,param="logging file",value="/home/lockywolf/gdb-log.log"
=cmd-param-changed,param="print pretty",value="on"
=cmd-param-changed,param="print array-indexes",value="on"
=cmd-param-changed,param="print array",value="on"
=cmd-param-changed,param="print symbol-filename",value="on"
=cmd-param-changed,param="print object",value="on"
=cmd-param-changed,param="print vtbl",value="on"
=cmd-param-changed,param="history save",value="on"
~"Reading symbols from a.out...\n"
(gdb)

Secondly:
The place where gdb-mode fail, IMO, is line 4688 in the gdb-mi.el,
function gdb-get-source-file
I inserted (write-file "/home/lockywolf/debugging-buffer.txt") right
after (goto-char (min-point)), and the contents of the file are:
lockywolf@delllaptop:~$ cat debugging-buffer.1.txt
line="1",file="../sysdeps/x86_64/start.S",fullname="/root/glibc-2a0c65c5167af50893952729ba38cc68/glibc-2.30/csu/../sysdeps/x86_64/start.S",macro-info="0"

/root/glibc-* is the place where Slackware developers compile glibc.
Doesn't seem like the correct file. The correct file is called
"second.f90", and is in the same directory.



сб, 28 мар. 2020 г. в 20:30, Eli Zaretskii <eliz@gnu.org>:
>
> > Date: Sat, 28 Mar 2020 15:11:27 +0300
> > From: Eli Zaretskii <eliz@gnu.org>
> > Cc: 40271@debbugs.gnu.org
> >
> > > From: Vladimir Nikishkin <lockywolf@gmail.com>
> > > Date: Sat, 28 Mar 2020 19:51:40 +0800
> > >
> > > The way to reproduce would be the following:
> > > 1)printf "program main\nend" > test.f90
> > > 2)gfortran test.f90
> > > 3)emacs -q
> > > 4)M-: (setq gdb-many-windows t) RET
> > > 5)gdb RET a.out RET
> > >
> > > Observe that gdb-mode fails to initialize.
> >
> > I cannot reproduce this on my system, debugging one of the programs in
> > the public /usr/bin/ directory (which are all stripped of the
> > debugging symbols).
> >
> > > This happens because in gdb-mi.el.gz, line 4689, gdb-main-file gets
> > > a completely unrelated .S file name relative to the directory where
> > > distro authors compile glibc.
> >
> > Please show all the related details (what regexp search fails, what
> > does it find, and what it ought to find instead), since otherwise it
> > will be very hard to fix this problem.
>
> Also, if you start GDB from the shell prompt, like this:
>
>   $ gdb -i=mi ./a.out
>
> and then issue the -file-list-exec-source-file command, what do you
> see?



-- 
Yours sincerely, Vladimir Nikishkin


-- 
Yours sincerely, Vladimir Nikishkin

bug#40271: 26.3; gdb-mode fails to initialize if the target executable is built without symbols

[Eli Zaretskii]

[Please keep the bug address on the CC line, so that this discussion
gets recorded by the Emacs issue tracker.]

> From: Vladimir Nikishkin <lockywolf@gmail.com>
> Date: Sat, 28 Mar 2020 20:38:50 +0800
> 
> I am not super sure how to debug this.
> 
> Firsly, regarding your question:
> 
> lockywolf@delllaptop:~/DevLinux/chibi-sicp$ gdb -i=mi a.out
> =thread-group-added,id="i1"
> ~"GNU gdb (GDB) 9.1\n"
> ~"Copyright (C) 2020 Free Software Foundation, Inc.\n"
> ~"License GPLv3+: GNU GPL version 3 or later
> <http://gnu.org/licenses/gpl.html>\nThis is free software: you are
> free to change and redistribute it.\nThere is NO WARRANTY, to the
> extent permitted by law."
> ~"\nType \"show copying\" and \"show warranty\" for details.\n"
> ~"This GDB was configured as \"x86_64-slackware-linux\".\n"
> ~"Type \"show configuration\" for configuration details.\n"
> ~"For bug reporting instructions, please see:\n"
> ~"<http://www.gnu.org/software/gdb/bugs/>.\n"
> ~"Find the GDB manual and other documentation resources online at:\n
>  <http://www.gnu.org/software/gdb/documentation/>."
> ~"\n\n"
> ~"For help, type \"help\".\n"
> ~"Type \"apropos word\" to search for commands related to \"word\"...\n"
> =cmd-param-changed,param="logging file",value="/home/lockywolf/gdb-log.log"
> =cmd-param-changed,param="print pretty",value="on"
> =cmd-param-changed,param="print array-indexes",value="on"
> =cmd-param-changed,param="print array",value="on"
> =cmd-param-changed,param="print symbol-filename",value="on"
> =cmd-param-changed,param="print object",value="on"
> =cmd-param-changed,param="print vtbl",value="on"
> =cmd-param-changed,param="history save",value="on"
> ~"Reading symbols from a.out...\n"
> (gdb)
> 
> Secondly:
> The place where gdb-mode fail, IMO, is line 4688 in the gdb-mi.el,
> function gdb-get-source-file
> I inserted (write-file "/home/lockywolf/debugging-buffer.txt") right
> after (goto-char (min-point)), and the contents of the file are:
> lockywolf@delllaptop:~$ cat debugging-buffer.1.txt
> line="1",file="../sysdeps/x86_64/start.S",fullname="/root/glibc-2a0c65c5167af50893952729ba38cc68/glibc-2.30/csu/../sysdeps/x86_64/start.S",macro-info="0"
> 
> /root/glibc-* is the place where Slackware developers compile glibc.
> Doesn't seem like the correct file. The correct file is called
> "second.f90", and is in the same directory.

That seems to be the problem: in my case I get an error message:

  (gdb)
  -file-list-exec-source-file
  ^error,msg="No symbol table is loaded.  Use the \"file\" command."

which is quite expected.

So I guess the problem is that your program is stripped, but the
standard C library isn't.  What do you suggest Emacs should do in this
case?  How can it know that the source file it's been fed isn't the
right one?

More generally, what is the use case where you want to debug a
stripped program in gdb-mi? why did you strip the program in the first
place?

bug#40271: 26.3; gdb-mode fails to initialize if the target executable is built without symbols

[Vladimir Nikishkin]

Sorry, I misunderstood you.

lockywolf@delllaptop:~$ gdb -i=mi a.out
=thread-group-added,id="i1"
~"GNU gdb (GDB) 9.1\n"
~"Copyright (C) 2020 Free Software Foundation, Inc.\n"
~"License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>\nThis is free software: you are
free to change and redistribute it.\nThere is NO WARRANTY, to the
extent permitted by law."
~"\nType \"show copying\" and \"show warranty\" for details.\n"
~"This GDB was configured as \"x86_64-slackware-linux\".\n"
~"Type \"show configuration\" for configuration details.\n"
~"For bug reporting instructions, please see:\n"
~"<http://www.gnu.org/software/gdb/bugs/>.\n"
~"Find the GDB manual and other documentation resources online at:\n
 <http://www.gnu.org/software/gdb/documentation/>."
~"\n\n"
~"For help, type \"help\".\n"
~"Type \"apropos word\" to search for commands related to \"word\"...\n"
=cmd-param-changed,param="logging file",value="/home/lockywolf/gdb-log.log"
=cmd-param-changed,param="print pretty",value="on"
=cmd-param-changed,param="print array-indexes",value="on"
=cmd-param-changed,param="print array",value="on"
=cmd-param-changed,param="print symbol-filename",value="on"
=cmd-param-changed,param="print object",value="on"
=cmd-param-changed,param="print vtbl",value="on"
=cmd-param-changed,param="history save",value="on"
~"Reading symbols from a.out...\n"
(gdb)
-file-list-exec-source-file
^done,line="1",file="../sysdeps/x86_64/start.S",fullname="/root/glibc-2a0c65c5167af50893952729ba38cc68/glibc-2.30/csu/../sysdeps/x86_64/start.S",macro-info="0"
(gdb)

I am confused, because libc is also expected to be stripped. Is this a gdb bug?

Frankly speaking, I just found this by mistake. I forgot to issue
-ggdb when compiling my code. I'm not a reverse engineer.

What to do... well, I am not an expert, but the opposite case, that is
when non-stripped code calls a stripped code function and encounters
and exception, certainly is handled some way. Maybe gdb-mode can say
something like "the most recent known file is claimed (by the code) to
be /root/blah.S, but this file is also missing (just as your debugging
symbols)". GDB itself does something like this:
(gdb) list
1    ../sysdeps/x86_64/start.S: No such file or directory.

In a perfect world it could ask for an external source address, but
perhaps this is an overkill



сб, 28 мар. 2020 г. в 21:12, Eli Zaretskii <eliz@gnu.org>:
>
> [Please keep the bug address on the CC line, so that this discussion
> gets recorded by the Emacs issue tracker.]
>
> > From: Vladimir Nikishkin <lockywolf@gmail.com>
> > Date: Sat, 28 Mar 2020 20:38:50 +0800
> >
> > I am not super sure how to debug this.
> >
> > Firsly, regarding your question:
> >
> > lockywolf@delllaptop:~/DevLinux/chibi-sicp$ gdb -i=mi a.out
> > =thread-group-added,id="i1"
> > ~"GNU gdb (GDB) 9.1\n"
> > ~"Copyright (C) 2020 Free Software Foundation, Inc.\n"
> > ~"License GPLv3+: GNU GPL version 3 or later
> > <http://gnu.org/licenses/gpl.html>\nThis is free software: you are
> > free to change and redistribute it.\nThere is NO WARRANTY, to the
> > extent permitted by law."
> > ~"\nType \"show copying\" and \"show warranty\" for details.\n"
> > ~"This GDB was configured as \"x86_64-slackware-linux\".\n"
> > ~"Type \"show configuration\" for configuration details.\n"
> > ~"For bug reporting instructions, please see:\n"
> > ~"<http://www.gnu.org/software/gdb/bugs/>.\n"
> > ~"Find the GDB manual and other documentation resources online at:\n
> >  <http://www.gnu.org/software/gdb/documentation/>."
> > ~"\n\n"
> > ~"For help, type \"help\".\n"
> > ~"Type \"apropos word\" to search for commands related to \"word\"...\n"
> > =cmd-param-changed,param="logging file",value="/home/lockywolf/gdb-log.log"
> > =cmd-param-changed,param="print pretty",value="on"
> > =cmd-param-changed,param="print array-indexes",value="on"
> > =cmd-param-changed,param="print array",value="on"
> > =cmd-param-changed,param="print symbol-filename",value="on"
> > =cmd-param-changed,param="print object",value="on"
> > =cmd-param-changed,param="print vtbl",value="on"
> > =cmd-param-changed,param="history save",value="on"
> > ~"Reading symbols from a.out...\n"
> > (gdb)
> >
> > Secondly:
> > The place where gdb-mode fail, IMO, is line 4688 in the gdb-mi.el,
> > function gdb-get-source-file
> > I inserted (write-file "/home/lockywolf/debugging-buffer.txt") right
> > after (goto-char (min-point)), and the contents of the file are:
> > lockywolf@delllaptop:~$ cat debugging-buffer.1.txt
> > line="1",file="../sysdeps/x86_64/start.S",fullname="/root/glibc-2a0c65c5167af50893952729ba38cc68/glibc-2.30/csu/../sysdeps/x86_64/start.S",macro-info="0"
> >
> > /root/glibc-* is the place where Slackware developers compile glibc.
> > Doesn't seem like the correct file. The correct file is called
> > "second.f90", and is in the same directory.
>
> That seems to be the problem: in my case I get an error message:
>
>   (gdb)
>   -file-list-exec-source-file
>   ^error,msg="No symbol table is loaded.  Use the \"file\" command."
>
> which is quite expected.
>
> So I guess the problem is that your program is stripped, but the
> standard C library isn't.  What do you suggest Emacs should do in this
> case?  How can it know that the source file it's been fed isn't the
> right one?
>
> More generally, what is the use case where you want to debug a
> stripped program in gdb-mi? why did you strip the program in the first
> place?



-- 
Yours sincerely, Vladimir Nikishkin

bug#40271: 26.3; gdb-mode fails to initialize if the target executable is built without symbols

[Vladimir Nikishkin]

I, personaly, would be happy with just a friendlier error message.

сб, 28 мар. 2020 г. в 21:26, Vladimir Nikishkin <lockywolf@gmail.com>:
>
> Sorry, I misunderstood you.
>
> lockywolf@delllaptop:~$ gdb -i=mi a.out
> =thread-group-added,id="i1"
> ~"GNU gdb (GDB) 9.1\n"
> ~"Copyright (C) 2020 Free Software Foundation, Inc.\n"
> ~"License GPLv3+: GNU GPL version 3 or later
> <http://gnu.org/licenses/gpl.html>\nThis is free software: you are
> free to change and redistribute it.\nThere is NO WARRANTY, to the
> extent permitted by law."
> ~"\nType \"show copying\" and \"show warranty\" for details.\n"
> ~"This GDB was configured as \"x86_64-slackware-linux\".\n"
> ~"Type \"show configuration\" for configuration details.\n"
> ~"For bug reporting instructions, please see:\n"
> ~"<http://www.gnu.org/software/gdb/bugs/>.\n"
> ~"Find the GDB manual and other documentation resources online at:\n
>  <http://www.gnu.org/software/gdb/documentation/>."
> ~"\n\n"
> ~"For help, type \"help\".\n"
> ~"Type \"apropos word\" to search for commands related to \"word\"...\n"
> =cmd-param-changed,param="logging file",value="/home/lockywolf/gdb-log.log"
> =cmd-param-changed,param="print pretty",value="on"
> =cmd-param-changed,param="print array-indexes",value="on"
> =cmd-param-changed,param="print array",value="on"
> =cmd-param-changed,param="print symbol-filename",value="on"
> =cmd-param-changed,param="print object",value="on"
> =cmd-param-changed,param="print vtbl",value="on"
> =cmd-param-changed,param="history save",value="on"
> ~"Reading symbols from a.out...\n"
> (gdb)
> -file-list-exec-source-file
> ^done,line="1",file="../sysdeps/x86_64/start.S",fullname="/root/glibc-2a0c65c5167af50893952729ba38cc68/glibc-2.30/csu/../sysdeps/x86_64/start.S",macro-info="0"
> (gdb)
>
> I am confused, because libc is also expected to be stripped. Is this a gdb bug?
>
> Frankly speaking, I just found this by mistake. I forgot to issue
> -ggdb when compiling my code. I'm not a reverse engineer.
>
> What to do... well, I am not an expert, but the opposite case, that is
> when non-stripped code calls a stripped code function and encounters
> and exception, certainly is handled some way. Maybe gdb-mode can say
> something like "the most recent known file is claimed (by the code) to
> be /root/blah.S, but this file is also missing (just as your debugging
> symbols)". GDB itself does something like this:
> (gdb) list
> 1    ../sysdeps/x86_64/start.S: No such file or directory.
>
> In a perfect world it could ask for an external source address, but
> perhaps this is an overkill
>
>
>
> сб, 28 мар. 2020 г. в 21:12, Eli Zaretskii <eliz@gnu.org>:
> >
> > [Please keep the bug address on the CC line, so that this discussion
> > gets recorded by the Emacs issue tracker.]
> >
> > > From: Vladimir Nikishkin <lockywolf@gmail.com>
> > > Date: Sat, 28 Mar 2020 20:38:50 +0800
> > >
> > > I am not super sure how to debug this.
> > >
> > > Firsly, regarding your question:
> > >
> > > lockywolf@delllaptop:~/DevLinux/chibi-sicp$ gdb -i=mi a.out
> > > =thread-group-added,id="i1"
> > > ~"GNU gdb (GDB) 9.1\n"
> > > ~"Copyright (C) 2020 Free Software Foundation, Inc.\n"
> > > ~"License GPLv3+: GNU GPL version 3 or later
> > > <http://gnu.org/licenses/gpl.html>\nThis is free software: you are
> > > free to change and redistribute it.\nThere is NO WARRANTY, to the
> > > extent permitted by law."
> > > ~"\nType \"show copying\" and \"show warranty\" for details.\n"
> > > ~"This GDB was configured as \"x86_64-slackware-linux\".\n"
> > > ~"Type \"show configuration\" for configuration details.\n"
> > > ~"For bug reporting instructions, please see:\n"
> > > ~"<http://www.gnu.org/software/gdb/bugs/>.\n"
> > > ~"Find the GDB manual and other documentation resources online at:\n
> > >  <http://www.gnu.org/software/gdb/documentation/>."
> > > ~"\n\n"
> > > ~"For help, type \"help\".\n"
> > > ~"Type \"apropos word\" to search for commands related to \"word\"...\n"
> > > =cmd-param-changed,param="logging file",value="/home/lockywolf/gdb-log.log"
> > > =cmd-param-changed,param="print pretty",value="on"
> > > =cmd-param-changed,param="print array-indexes",value="on"
> > > =cmd-param-changed,param="print array",value="on"
> > > =cmd-param-changed,param="print symbol-filename",value="on"
> > > =cmd-param-changed,param="print object",value="on"
> > > =cmd-param-changed,param="print vtbl",value="on"
> > > =cmd-param-changed,param="history save",value="on"
> > > ~"Reading symbols from a.out...\n"
> > > (gdb)
> > >
> > > Secondly:
> > > The place where gdb-mode fail, IMO, is line 4688 in the gdb-mi.el,
> > > function gdb-get-source-file
> > > I inserted (write-file "/home/lockywolf/debugging-buffer.txt") right
> > > after (goto-char (min-point)), and the contents of the file are:
> > > lockywolf@delllaptop:~$ cat debugging-buffer.1.txt
> > > line="1",file="../sysdeps/x86_64/start.S",fullname="/root/glibc-2a0c65c5167af50893952729ba38cc68/glibc-2.30/csu/../sysdeps/x86_64/start.S",macro-info="0"
> > >
> > > /root/glibc-* is the place where Slackware developers compile glibc.
> > > Doesn't seem like the correct file. The correct file is called
> > > "second.f90", and is in the same directory.
> >
> > That seems to be the problem: in my case I get an error message:
> >
> >   (gdb)
> >   -file-list-exec-source-file
> >   ^error,msg="No symbol table is loaded.  Use the \"file\" command."
> >
> > which is quite expected.
> >
> > So I guess the problem is that your program is stripped, but the
> > standard C library isn't.  What do you suggest Emacs should do in this
> > case?  How can it know that the source file it's been fed isn't the
> > right one?
> >
> > More generally, what is the use case where you want to debug a
> > stripped program in gdb-mi? why did you strip the program in the first
> > place?
>
>
>
> --
> Yours sincerely, Vladimir Nikishkin



-- 
Yours sincerely, Vladimir Nikishkin

bug#40271: 26.3; gdb-mode fails to initialize if the target executable is built without symbols

[Eli Zaretskii]

> From: Vladimir Nikishkin <lockywolf@gmail.com>
> Date: Sat, 28 Mar 2020 21:26:12 +0800
> Cc: 40271@debbugs.gnu.org
> 
> (gdb)
> -file-list-exec-source-file
> ^done,line="1",file="../sysdeps/x86_64/start.S",fullname="/root/glibc-2a0c65c5167af50893952729ba38cc68/glibc-2.30/csu/../sysdeps/x86_64/start.S",macro-info="0"
> (gdb)
> 
> I am confused, because libc is also expected to be stripped. Is this a gdb bug?

I don't think so.  start.S is probably the startup module that gets
linked into every program; it is provided by glibc.  I don't know
enough about linking on GNU/Linux, but I think if you strip the
binary, this file name will also be stripped, and everything will work
again (except that you will be unable to step through the source).

> Frankly speaking, I just found this by mistake. I forgot to issue
> -ggdb when compiling my code. I'm not a reverse engineer.

Right, that figures.  So I'm unsure we should do anything about this
in Emacs.  Though maybe we could have a special test for a source file
called "start.S".

bug#40271: 26.3; gdb-mode fails to initialize if the target executable is built without symbols

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

>> Frankly speaking, I just found this by mistake. I forgot to issue
>> -ggdb when compiling my code. I'm not a reverse engineer.
>
> Right, that figures.  So I'm unsure we should do anything about this
> in Emacs.  Though maybe we could have a special test for a source file
> called "start.S".

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

Skimming this bug report, it doesn't seem like there's anything much
productive we can do on the Emacs side here, so I'm therefore closing
this bug report.  If there's something useful we can do, please respond
to the debbugs address and we'll reopen.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no