bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[Roland Coeurjoly]

[-- Attachment #1: Type: text/plain, Size: 24723 bytes --]

When I try to run:
M-x gdb <RET> docker-compose -f ~/docker-services/dev/docker-compose.yml
exec dev_rhel7 bash -c "gdb -i=mi" <RET>
I get the following error:
Error: you did not specify -i=mi on GDB's command line!

In GNU Emacs 26.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 2.24.32)
 of 2020-02-07 built on des26
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Debian GNU/Linux 10 (buster)

Recent messages:
Checking 105 files in /usr/local/share/emacs/26.3/lisp/obsolete...
Checking for load-path shadows...done
Auto-saving...
previous-line: Beginning of buffer [11 times]
C-x C-g is undefined
funcall-interactively: Beginning of buffer [10 times]
previous-line: Beginning of buffer [28 times]
Buffer *unsent mail to bug-gnu-emacs@gnu.org* modified; kill anyway? (y or
n) y
Buffer "*gud-docker-compose.yml*" has a running process; kill it? (y or n) y
Error: you did not specify -i=mi on GDB’s command line!

Configured features:
XPM JPEG TIFF GIF PNG SOUND GSETTINGS GLIB NOTIFY LIBSELINUX GNUTLS
LIBXML2 FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK2 X11 XDBE XIM THREADS

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Debugger

Minor modes in effect:
  gdb-many-windows: t
  helm-descbinds-mode: t
  helm-mode: t
  helm-flx-mode: t
  helm--remap-mouse-mode: t
  recentf-mode: t
  global-semanticdb-minor-mode: t
  global-semantic-idle-scheduler-mode: t
  global-semantic-idle-summary-mode: t
  global-semantic-stickyfunc-mode: t
  semantic-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  global-auto-complete-mode: t
  global-company-mode: t
  company-mode: t
  global-magit-file-mode: t
  global-spacemacs-whitespace-cleanup-mode: t
  spacemacs-whitespace-cleanup-mode: t
  winum-mode: t
  winner-mode: t
  volatile-highlights-mode: t
  global-vi-tilde-fringe-mode: t
  save-place-mode: t
  savehist-mode: t
  popwin-mode: t
  nyan-mode: t
  Info-breadcrumbs-in-mode-line-mode: t
  global-git-gutter+-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  flycheck-pos-tip-mode: t
  global-flycheck-mode: t
  flx-ido-mode: t
  eyebrowse-mode: t
  global-evil-surround-mode: t
  evil-surround-mode: t
  global-evil-search-highlight-persist: t
  evil-search-highlight-persist: t
  show-smartparens-global-mode: t
  show-smartparens-mode: t
  smartparens-mode: t
  evil-escape-mode: t
  global-anzu-mode: t
  anzu-mode: t
  eval-sexp-fu-flash-mode: t
  diff-auto-refine-mode: t
  clean-aindent-mode: t
  holy-mode: t
  which-key-mode: t
  override-global-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  shell-dirtrack-mode: t
  evil-mode: t
  evil-local-mode: t
  spacemacs-leader-override-mode: t
  global-spacemacs-leader-override-mode: t
  xterm-mouse-mode: t
  global-auto-revert-mode: t
  ido-vertical-mode: t
  global-page-break-lines-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-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
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/drcoeurjoly/.emacs.d/elpa/ht-20200217.2331/ht hides
/home/drcoeurjoly/.emacs.d/core/libs/ht
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-ledger hides
/usr/local/share/emacs/26.3/lisp/org/ob-ledger
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ox-icalendar
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/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-eval hides
/usr/local/share/emacs/26.3/lisp/org/ob-eval
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-indent hides
/usr/local/share/emacs/26.3/lisp/org/org-indent
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-inlinetask
hides /usr/local/share/emacs/26.3/lisp/org/org-inlinetask
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-attach hides
/usr/local/share/emacs/26.3/lisp/org/org-attach
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-emacs-lisp
hides /usr/local/share/emacs/26.3/lisp/org/ob-emacs-lisp
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-feed hides
/usr/local/share/emacs/26.3/lisp/org/org-feed
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-duration
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/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ox-latex hides
/usr/local/share/emacs/26.3/lisp/org/ox-latex
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-js hides
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/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-datetree
hides /usr/local/share/emacs/26.3/lisp/org/org-datetree
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org hides
/usr/local/share/emacs/26.3/lisp/org/org
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-faces hides
/usr/local/share/emacs/26.3/lisp/org/org-faces
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-screen hides
/usr/local/share/emacs/26.3/lisp/org/ob-screen
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-archive hides
/usr/local/share/emacs/26.3/lisp/org/org-archive
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-src hides
/usr/local/share/emacs/26.3/lisp/org/org-src
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-mouse hides
/usr/local/share/emacs/26.3/lisp/org/org-mouse
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-dot hides
/usr/local/share/emacs/26.3/lisp/org/ob-dot
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-shen hides
/usr/local/share/emacs/26.3/lisp/org/ob-shen
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-sql hides
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/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-protocol
hides /usr/local/share/emacs/26.3/lisp/org/org-protocol
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-matlab hides
/usr/local/share/emacs/26.3/lisp/org/ob-matlab
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-processing
hides /usr/local/share/emacs/26.3/lisp/org/ob-processing
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-lua hides
/usr/local/share/emacs/26.3/lisp/org/ob-lua
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-ctags hides
/usr/local/share/emacs/26.3/lisp/org/org-ctags
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ox-publish hides
/usr/local/share/emacs/26.3/lisp/org/ox-publish
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-R hides
/usr/local/share/emacs/26.3/lisp/org/ob-R
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-stan hides
/usr/local/share/emacs/26.3/lisp/org/ob-stan
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ox-md hides
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/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-colview hides
/usr/local/share/emacs/26.3/lisp/org/org-colview
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-shell hides
/usr/local/share/emacs/26.3/lisp/org/ob-shell
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-macs hides
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/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ox-odt hides
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/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-ocaml hides
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/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ox-man hides
/usr/local/share/emacs/26.3/lisp/org/ox-man
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-entities
hides /usr/local/share/emacs/26.3/lisp/org/org-entities
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-table hides
/usr/local/share/emacs/26.3/lisp/org/ob-table
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ox-texinfo hides
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/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-calc hides
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/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-core hides
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/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-timer hides
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/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-plot hides
/usr/local/share/emacs/26.3/lisp/org/org-plot
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-ref hides
/usr/local/share/emacs/26.3/lisp/org/ob-ref
/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-picolisp hides
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/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/ob-J hides
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/home/drcoeurjoly/.emacs.d/elpa/org-plus-contrib-20200323/org-macro hides
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srecode/filters srecode/args ede/speedbar ede/files ede ede/detect
ede/base ede/source eieio-speedbar eieio-custom srecode/find srecode/map
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Memory information:
((conses 16 1314504 428302)
 (symbols 48 86343 66)
 (miscs 40 716 1732)
 (strings 32 276086 149761)
 (string-bytes 1 8825028)
 (vectors 16 124544)
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 (buffers 992 38))

[-- Attachment #2: Type: text/html, Size: 25509 bytes --]

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[Lars Ingebrigtsen]

Roland Coeurjoly <rolandcoeurjoly@gmail.com> writes:

> When I try to run:
> M-x gdb <RET> docker-compose -f ~/docker-services/dev/docker-compose.yml
> exec dev_rhel7 bash -c "gdb -i=mi" <RET>
> I get the following error:
> Error: you did not specify -i=mi on GDB's command line!

I don't know docker, but this is a message Emacs gives when gdb doesn't
start up and output the data that knows that it has been started
correctly.

So the message may be slightly misleading, but the problem seems to be
that gdb isn't started properly?  Here's the code:

(defun gdb--check-interpreter (filter proc string)
  (unless (zerop (length string))
    (remove-function (process-filter proc) #'gdb--check-interpreter)
    (unless (memq (aref string 0) '(?^ ?~ ?@ ?& ?* ?=))
      ;; Apparently we're not running with -i=mi.
      (let ((msg "Error: you did not specify -i=mi on GDB's command line!"))

So is there a problem with your gdb invocation via docker?

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

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[Roland Coeurjoly]

[-- Attachment #1: Type: text/plain, Size: 8453 bytes --]

Yes, the problem is that it doesn't split the frame in different windows,
and nothing good happens.

I need to run gdb inside Docker, and I have a strong preference for the
interface provided by emacs.

When doing M-x gdb, I enter "docker-compose -f
~/docker-services/dev/docker-compose.yml exec dev_rhel7 bash -c "gdb
-i=mi"", and then it shows me the following message.

Current directory is /home/drcoeurjoly/docker-services/dev/

Error: you did not specify -i=mi on GDB's command line! WARNING: The MY_UID
variable is not set. Defaulting to a blank string.

1-inferior-tty-set /dev/pts/3

2-gdb-set height 0

3-gdb-set non-stop 1

4-enable-pretty-printing

5-file-list-exec-source-files

6-file-list-exec-source-file

7-gdb-show prompt

8-stack-info-frame

9-thread-info

10-break-list

11-thread-info

12-break-list

=thread-group-added,id="i1"

~"GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-114.el7\n"

~"Copyright (C) 2013 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. Type \"show copying\"\nand \"show warranty\" for details.\n"

~"This GDB was configured as \"x86_64-redhat-linux-gnu\".\nFor bug
reporting instructions, please see:\n"

~"http://www.gnu.org/software/gdb/bugs/.\n"

=cmd-param-changed,param="history save",value="on"

=cmd-param-changed,param="history
filename",value="/home/drcoeurjoly/dotfiles/gdb/.gdb_history"

=cmd-param-changed,param="print pretty",value="on"

=cmd-param-changed,param="print object",value="on"

=cmd-param-changed,param="print vtbl",value="on"

=cmd-param-changed,param="demangle-style",value="gnu-v3"

=cmd-param-changed,param="follow-fork-mode",value="child"

=cmd-param-changed,param="detach-on-fork",value="off"

(gdb)

1^done

(gdb)

2^done

(gdb)

3^done

(gdb)

4^done

(gdb)

5^done,files=[]

(gdb)

6^error,msg="No symbol table is loaded. Use the \"file\" command."

(gdb)

7^done,value="(gdb) "

(gdb)

8^error,msg="No registers."

(gdb)

9^done,threads=[]

(gdb)

10^done,BreakpointTable={nr_rows="0",nr_cols="6",hdr=[{width="7",alignment="-1",col_name="number",colhdr="Num"},{width="14",alignment="-1",col_name="type",colhdr="Type"},{width="4",alignment="-1",col_name="disp",colhdr="Disp"},{width="3",alignment="-1",col_name="enabled",colhdr="Enb"},{width="10",alignment="-1",col_name="addr",colhdr="Address"},{width="40",alignment="2",col_name="what",colhdr="What"}],body=[]}

(gdb)

11^done,threads=[]

(gdb)

12^done,BreakpointTable={nr_rows="0",nr_cols="6",hdr=[{width="7",alignment="-1",col_name="number",colhdr="Num"},{width="14",alignment="-1",col_name="type",colhdr="Type"},{width="4",alignment="-1",col_name="disp",colhdr="Disp"},{width="3",alignment="-1",col_name="enabled",colhdr="Enb"},{width="10",alignment="-1",col_name="addr",colhdr="Address"},{width="40",alignment="2",col_name="what",colhdr="What"}],body=[]}

(gdb)

Note that I successfully enter gdb in Docker, since GDB says:

"GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-114.el7\n"

In my host operating system (Debian): gdb --version outputs:

GNU gdb (Debian 8.2.1-2+b3) 8.2.1

In Debian, I execute the Docker command: docker-compose -f
~/docker-services/dev/docker-compose.yml exec dev_rhel7 bash -c "gdb -i=mi"
and I get the machine-oriented text interface.

From the previous test I deduce that it is an issue of emacs, not Docker.

When entering the path of a binary instead of the option -i=mi, it reads
the symbols just fine: M-x gdb RETURN docker-compose -f
~/docker-services/dev/docker-compose.yml exec dev_rhel7 bash -c "gdb
~/babel_sandbox/build/foo" which outputs:

Current directory is /home/drcoeurjoly/docker-services/dev/

Error: you did not specify -i=mi on GDB's command line!

WARNING: The MY_UID variable is not set. Defaulting to a blank string.

1-inferior-tty-set /dev/pts/3

2-gdb-set height 0

3-gdb-set non-stop 1

4-enable-pretty-printing

5-file-list-exec-source-files

6-file-list-exec-source-file

7-gdb-show prompt

8-stack-info-frame

9-thread-info

10-break-list

11-thread-info

12-break-list

GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-114.el7

Copyright (C) 2013 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law. Type "show copying"

and "show warranty" for details.

This GDB was configured as "x86_64-redhat-linux-gnu".

For bug reporting instructions, please see:

http://www.gnu.org/software/gdb/bugs/...

Reading symbols from /home/drcoeurjoly/babel_sandbox/build/foo...done.

(gdb) 1-inferior-tty-set /dev/pts/3

Undefined command: "1-inferior-tty-set". Try "help".

(gdb) 2-gdb-set height 0

Undefined command: "2-gdb-set". Try "help".

(gdb) 3-gdb-set non-stop 1

Undefined command: "3-gdb-set". Try "help".

(gdb) 4-enable-pretty-printing

Undefined command: "4-enable-pretty-printing". Try "help".

(gdb) 5-file-list-exec-source-files

Undefined command: "5-file-list-exec-source-files". Try "help".

(gdb) 6-file-list-exec-source-file

Undefined command: "6-file-list-exec-source-file". Try "help".

(gdb) 7-gdb-show prompt

Undefined command: "7-gdb-show". Try "help".

(gdb) 8-stack-info-frame

Undefined command: "8-stack-info-frame". Try "help".

(gdb) 9-thread-info

Undefined command: "9-thread-info". Try "help".

(gdb) 10-break-list

Undefined command: "10-break-list". Try "help".

(gdb) 11-thread-info

Undefined command: "11-thread-info". Try "help".

(gdb) 12-break-list

Undefined command: "12-break-list". Try "help".

(gdb)

I also tried putting the gdb -i=mi inside a script and calling that from
emacs, to no avail. Calling directly from bash worked and not from emacs.

Relevant information:

   - My spacemacs config <https://github.com/RCoeurjoly/dotfiles>
   - foo program <https://github.com/RCoeurjoly/babel_sandbox/> used for
   testing argument passing to gdb in emacs.

I don't know if the dockerfile and docker-compose yml are relevant. If so,
I will create a repo.

Versions:

Host: uname -a

Linux des26 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u2 (2019-11-11)
x86_64 GNU/Linux

Emacs in host: emacs --version

GNU Emacs 26.3

GDB in host: gdb --version

GNU gdb (Debian 8.2.1-2+b3) 8.2.1

Docker in host: docker --version

Docker version 18.09.1, build 4c52b90

Docker-compose in host: docker-compose --version

docker-compose version 1.21.0, build unknown

Docker container: cat /etc/redhat-release

CentOS Linux release 7.5.1804 (Core)

GDB in docker container: gdb --version

GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-114.el7

This issue was reported by Robert Mecklenburg here
<https://lists.gnu.org/archive/html/bug-gnu-emacs/2017-08/msg01216.html>
and here
<https://forums.docker.com/t/emacs-gud-mode-fails-with-docker-gdb/37452> as
early as august 2017.

On Mon, Oct 26, 2020 at 3:19 PM Lars Ingebrigtsen <larsi@gnus.org> wrote:

> Roland Coeurjoly <rolandcoeurjoly@gmail.com> writes:
>
> > When I try to run:
> > M-x gdb <RET> docker-compose -f ~/docker-services/dev/docker-compose.yml
> > exec dev_rhel7 bash -c "gdb -i=mi" <RET>
> > I get the following error:
> > Error: you did not specify -i=mi on GDB's command line!
>
> I don't know docker, but this is a message Emacs gives when gdb doesn't
> start up and output the data that knows that it has been started
> correctly.
>
> So the message may be slightly misleading, but the problem seems to be
> that gdb isn't started properly?  Here's the code:
>
> (defun gdb--check-interpreter (filter proc string)
>   (unless (zerop (length string))
>     (remove-function (process-filter proc) #'gdb--check-interpreter)
>     (unless (memq (aref string 0) '(?^ ?~ ?@ ?& ?* ?=))
>       ;; Apparently we're not running with -i=mi.
>       (let ((msg "Error: you did not specify -i=mi on GDB's command
> line!"))
>
> So is there a problem with your gdb invocation via docker?
>
> --
> (domestic pets only, the antidote for overdose, milk.)
>    bloggy blog: http://lars.ingebrigtsen.no
>

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bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[Lars Ingebrigtsen]

Roland Coeurjoly <rolandcoeurjoly@gmail.com> writes:

> Yes, the problem is that it doesn't split the frame in different windows, and nothing
> good happens.
>
> I need to run gdb inside Docker, and I have a strong preference for the interface
> provided by emacs.
>
> When doing M-x gdb, I enter "docker-compose -f
> ~/docker-services/dev/docker-compose.yml exec dev_rhel7 bash -c "gdb -i=mi"",
> and then it shows me the following message.

Like I said, I know nothing about Docker, but my totally uninformed
guess would be that something in that command line mangles the output
from gdb, somehow, so that Emacs is no longer able to parse it.

It's hard to tell, since you're posting via Gmail, as HTML, and the
output examples you include have been mangled beyond recognition.

Perhaps try including them as attachments?

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

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[Roland Coeurjoly]

[-- Attachment #1: Type: text/plain, Size: 1488 bytes --]

>
> Like I said, I know nothing about Docker, but my totally uninformed
> guess would be that something in that command line mangles the output
> from gdb, somehow, so that Emacs is no longer able to parse it.


Yes, that seems to be the case.

I posted this in stackoverflow here:
https://stackoverflow.com/questions/60112087/error-you-did-not-specify-i-mi-on-gdbs-command-line-in-docker

Would that be ok just to provide the link?

On Mon, Oct 26, 2020 at 10:01 PM Lars Ingebrigtsen <larsi@gnus.org> wrote:

> Roland Coeurjoly <rolandcoeurjoly@gmail.com> writes:
>
> > Yes, the problem is that it doesn't split the frame in different
> windows, and nothing
> > good happens.
> >
> > I need to run gdb inside Docker, and I have a strong preference for the
> interface
> > provided by emacs.
> >
> > When doing M-x gdb, I enter "docker-compose -f
> > ~/docker-services/dev/docker-compose.yml exec dev_rhel7 bash -c "gdb
> -i=mi"",
> > and then it shows me the following message.
>
> Like I said, I know nothing about Docker, but my totally uninformed
> guess would be that something in that command line mangles the output
> from gdb, somehow, so that Emacs is no longer able to parse it.
>
> It's hard to tell, since you're posting via Gmail, as HTML, and the
> output examples you include have been mangled beyond recognition.
>
> Perhaps try including them as attachments?
>
> --
> (domestic pets only, the antidote for overdose, milk.)
>    bloggy blog: http://lars.ingebrigtsen.no
>

[-- Attachment #2: Type: text/html, Size: 2397 bytes --]

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[Lars Ingebrigtsen]

Roland Coeurjoly <rolandcoeurjoly@gmail.com> writes:

>  Like I said, I know nothing about Docker, but my totally uninformed
>  guess would be that something in that command line mangles the output
>  from gdb, somehow, so that Emacs is no longer able to parse it.
>
> Yes, that seems to be the case.
>
> I posted this in stackoverflow here:
> https://stackoverflow.com/questions/60112087/error-you-did-not-specify-i-mi-on-gdbs-command-line-in-docker
>
> Would that be ok just to provide the link?

I don't see anything on that link that wasn't in your bug report, so --
no, that doesn't really get us anywhere further.

The problem is, as I was guessing, that your command line does something
with the stream output from gdb that make Emacs not able to interpret
it.  If you posted the actual output here (not as HTML, but as a text
attachment), it might help us further guess what it is that's
happening.

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

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[William Xu]

Roland Coeurjoly <rolandcoeurjoly@gmail.com> writes:

> From the previous test I deduce that it is an issue of emacs, not
> Docker.

I recently tried to setup calling gdb from docker as well, I also got
some weird errors. Eventually I'm able to make it work by disabling the
I/O separation (via "-inferior-tty-set") done by gdb mode.

Root cause seems that emacs allocates an inferior tty (for I/O
separation in gdb) for the *host*, which of course is not known to
docker gdb. I'm not really sure how it should be properly fixed.

This is my setup, I wrap around the gdb docker in a script: 
https://lists.gnu.org/archive/html/help-gnu-emacs/2020-10/msg00311.html

This is the change I have to make: 
https://lists.gnu.org/archive/html/help-gnu-emacs/2020-10/msg00369.html


P.S. I had hope on tramp remote gdb, but there are other issues... :(
  https://lists.gnu.org/archive/html/bug-gnu-emacs/2020-10/msg01839.html

-- 
William

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[Lars Ingebrigtsen]

William Xu <william.xwl@gmail.com> writes:

> This is the change I have to make: 
> https://lists.gnu.org/archive/html/help-gnu-emacs/2020-10/msg00369.html

For reference, your proposed patch is just:

diff --git a/lisp/progmodes/gdb-mi.el b/lisp/progmodes/gdb-mi.el
index f0262c2315..7df23a6f41 100644
--- a/lisp/progmodes/gdb-mi.el
+++ b/lisp/progmodes/gdb-mi.el
@@ -1658,14 +1658,7 @@ gdb-display-io-buffer
 (defun gdb-inferior-io--init-proc (proc)
   ;; Set up inferior I/O.  Needs GDB 6.4 onwards.
   (set-process-filter proc 'gdb-inferior-filter)
-  (set-process-sentinel proc 'gdb-inferior-io-sentinel)
-  ;; The process can run on a remote host.
-  (let ((tty (or (process-get proc 'remote-tty)
-		 (process-tty-name proc))))
-    (unless (or (null tty)
-		(string= tty ""))
-      (gdb-input
-       (concat "-inferior-tty-set " tty) 'ignore))))
+  (set-process-sentinel proc 'gdb-inferior-io-sentinel))
 
 (defun gdb-inferior-io-sentinel (proc _str)
   (when (eq (process-status proc) 'failed)

I tried looking at the VC logs to see what the point of the
inferior-tty-set command was, but the only mention I found was:

     (gdb-inferior-io--init-proc): Don't send "-inferior-tty" command
     if the TTY name is nil or empty (which happens when communicating
     with the inferior via pipes, e.g. on MS-Windows).

Which just disables it on Windows?

Hm...  it was introduced below, but doesn't really say why.

commit f30d612a7a628828baa7c333629a10295605291b
Author:     Chong Yidong <cyd@gnu.org>
AuthorDate: Fri Apr 20 14:39:29 2012 +0800

And as far as I can tell, gdb runs just fine without it, even on
GNU/Linux?

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

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[William Xu]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> And as far as I can tell, gdb runs just fine without it, even on
> GNU/Linux?

Without that, the gdb commands and program I/O are mixed together in the
same buffer, so "*input/output of...*" window in gdb-many-windows will
be empty.

It is mostly useful if there is a lot of I/O from the program. It makes
it easier to inspect only the program I/O in that separated buffer.

So my change will kill the I/O separation. But then most of gdb mode
features will work.

Eli has explained it in my thread:
https://lists.gnu.org/archive/html/help-gnu-emacs/2020-10/msg00392.html

-- 
William

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Tue, 27 Oct 2020 20:14:07 +0100
> Cc: 40279@debbugs.gnu.org
> 
> I tried looking at the VC logs to see what the point of the
> inferior-tty-set command was, but the only mention I found was:
> 
>      (gdb-inferior-io--init-proc): Don't send "-inferior-tty" command
>      if the TTY name is nil or empty (which happens when communicating
>      with the inferior via pipes, e.g. on MS-Windows).
> 
> Which just disables it on Windows?

Yes.  Because on Windows this is nothing but trouble.

> Hm...  it was introduced below, but doesn't really say why.
> 
> commit f30d612a7a628828baa7c333629a10295605291b
> Author:     Chong Yidong <cyd@gnu.org>
> AuthorDate: Fri Apr 20 14:39:29 2012 +0800
> 
> And as far as I can tell, gdb runs just fine without it, even on
> GNU/Linux?

It is needed to redirect the I/O of the program being debugged into a
separate buffer, so it doesn't get mixed with the interaction between
the user and GDB.  gdb-many-windows creates, among others, a buffer
where the program's I/O is redirected.

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[Lars Ingebrigtsen]

William Xu <william.xwl@gmail.com> writes:

> Lars Ingebrigtsen <larsi@gnus.org> writes:
>
>> And as far as I can tell, gdb runs just fine without it, even on
>> GNU/Linux?
>
> Without that, the gdb commands and program I/O are mixed together in the
> same buffer, so "*input/output of...*" window in gdb-many-windows will
> be empty.

Ah, I see.

> It is mostly useful if there is a lot of I/O from the program. It makes
> it easier to inspect only the program I/O in that separated buffer.
>
> So my change will kill the I/O separation. But then most of gdb mode
> features will work.

Does the `M-x gud-gdb' command work OK in the Docker use case?  That one
doesn't have a separate socket for the I/O.

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

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[Eli Zaretskii]

> From: William Xu <william.xwl@gmail.com>
> Date: Tue, 27 Oct 2020 21:04:55 +0100
> 
> Lars Ingebrigtsen <larsi@gnus.org> writes:
> 
> > And as far as I can tell, gdb runs just fine without it, even on
> > GNU/Linux?
> 
> Without that, the gdb commands and program I/O are mixed together in the
> same buffer, so "*input/output of...*" window in gdb-many-windows will
> be empty.
> 
> It is mostly useful if there is a lot of I/O from the program. It makes
> it easier to inspect only the program I/O in that separated buffer.

No, it's useful even if the program does only a small amount of I/O,
because running GDB in the default mode on GNU/Linux lets you run the
program in the non-stop mode, where GDB and the program run in
parallel -- in that case if they both output stuff to the same file
descriptor, you will get an illegible mess.

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[William Xu]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Does the `M-x gud-gdb' command work OK in the Docker use case?  That one
> doesn't have a separate socket for the I/O.

I just tested it, yes, it works well without my change. 

-- 
William

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[Lars Ingebrigtsen]

William Xu <william.xwl@gmail.com> writes:

> Lars Ingebrigtsen <larsi@gnus.org> writes:
>
>> Does the `M-x gud-gdb' command work OK in the Docker use case?  That one
>> doesn't have a separate socket for the I/O.
>
> I just tested it, yes, it works well without my change. 

I think it's probably not feasible to get the gdb-mi interface working
within Docker (with Emacs on the outside), so I think the right fix here
is to just make the error message less sure of itself.

I've now done this in Emacs 28.

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

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[William Xu]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> I think it's probably not feasible to get the gdb-mi interface working
> within Docker (with Emacs on the outside), so I think the right fix here
> is to just make the error message less sure of itself.
>
> I've now done this in Emacs 28.

The new error message looks much more informative/helpful than before. 
Thanks. 

-- 
William

bug#40279: 26.3; Error: you did not specify -i=mi on GDB's command line!

[William Xu]

Roland Coeurjoly <rolandcoeurjoly@gmail.com> writes:

> When doing M-x gdb, I enter "docker-compose -f ~/docker-services/dev/docker-compose.yml exec dev_rhel7 bash -c "gdb -i=mi"", and then
> it shows me the following message.
>
>  Current directory is /home/drcoeurjoly/docker-services/dev/
>
>  Error: you did not specify -i=mi on GDB's command line! WARNING: The MY_UID variable is not set. Defaulting to a blank string.

Is "WARNING: The MY_UID variable is not set. Defaulting to a blank
string." coming from your docker or bash? 

The check of gdb--check-interpreter looks pretty weak, as long as there
is anything that will be written to stdout before the gdb cmd itself, it
will fail with below check:

#+begin_src emacs-lisp
    (unless (memq (aref string 0) '(?^ ?~ ?@ ?& ?* ?=))
#+end_src

which will further set below filter. The filter below seems preventing
the gdb-mi to work: 

#+begin_src emacs-lisp
      (set (make-local-variable 'gud-marker-filter) #'gud-gdb-marker-filter)
#+end_src

One can easily reproduce similar error, by wrapping around gdb with
"echo hi" at the front: 

#+begin_src shell-script
#!/bin/sh

arg="$@"
echo hi
gdb -i=mi ${arg}
#+end_src

IMO, in the above cases, we should not immediately fall back to gud-gdb
filter. The user should at least get a chance (like yes-or-no-p) to
continue with gdb-mi, regardless of the sometimes-false-positive error.

-- 
William