GNU bug report logs - #61973
M-x gdb ends up with infinite prompts before starting the process

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#61973: closed (M-x gdb ends up with infinite prompts before
 starting the process)
Date: Tue, 07 Mar 2023 12:50:03 +0000

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Your message dated Tue, 07 Mar 2023 14:49:02 +0200
with message-id <83bkl47mm9.fsf <at> gnu.org>
and subject line Re: bug#61973: M-x gdb ends up with infinite prompts before starting the process
has caused the debbugs.gnu.org bug report #61973,
regarding M-x gdb ends up with infinite prompts before starting the process
to be marked as done.

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help-debbugs <at> gnu.org.)


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From: Dmitry Gutov <dgutov <at> yandex.ru>
To: bug-gnu-emacs <at> gnu.org
Subject: M-x gdb ends up with infinite prompts before starting the process
Date: Sun, 5 Mar 2023 03:13:35 +0200

1. Run compiled 'emacs' from 'src'.
2. M-x gdb
3. Answer prompt: Run gdb (like this): gdb -i=mi ./emacs
4. See this prompt repeated indefinitely, no matter what I answer:

This GDB supports auto-downloading debuginfo from the following URLs:
https://debuginfod.ubuntu.com
Enable debuginfod for this session? (y or [n]) Please answer y or [n].

(Emacs 29, more or less latest.)

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Dmitry Gutov <dgutov <at> yandex.ru>
Cc: 61973-done <at> debbugs.gnu.org
Subject: Re: bug#61973: M-x gdb ends up with infinite prompts before starting
 the process
Date: Tue, 07 Mar 2023 14:49:02 +0200

> Date: Tue, 7 Mar 2023 00:48:59 +0200
> Cc: 61973 <at> debbugs.gnu.org
> From: Dmitry Gutov <dgutov <at> yandex.ru>
> 
> > Could you please try the patch below?  I don't have access to a system
> > where GDB can actually download the files from debuginfod servers, so
> > I could test this only partially.  Please test all the 3 possible
> > values of the new defcustom gdb-debuginfod-enable-setting.  TIA.
> 
> Looking good! Thank you.

Thanks, installed, and closing the bug.

> I have tries all 3 possible values, and the behavior looks as expected. 
> With 't', I even see a small delay when launching the process, 
> presumably from contacting some debuginfo server.
> 
> I haven't been able to verify that the debuginfo stuff is actually 
> working (nor sure where to look), but the basic functionality is now okay.

Apparently, if you do:

  set debuginfo verbose 1

(probably in your ~/.gdbinit file or somesuch, so that it is set from
the beginning of the session), it is supposed to show you messages
about downloading.  But this is documented to be 1 by default, so
maybe you don't see it because gdb-mi.el "swallows" those messages?
Try from the shell prompt and see if you get any messages.  They are
supposed to begin with "Downloading".  I think the download will only
happen if you debug a program whose sources and/or debug info are not
available locally.

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