bug#64186: Patch: Suppress deprecated '-gdb-set target-async' warning message in gdb-mi.el

[Wang Diancheng]

Eli Zaretskii <eliz@gnu.org> 于2023年6月29日周四 14:08写道：
>
> > From: Wang Diancheng <dianchengwang@gmail.com>
> > Date: Wed, 28 Jun 2023 11:51:39 +0800
> > Cc: luangruo@yahoo.com, 64186@debbugs.gnu.org
> >
> > I did some hacks to make gdb-non-stop work, patch is attached. The
> > patch try to set `gdb-non-stop` when target is running or at first
> > stop. Sorry for rough patch. I'm new for elisp.
>
> Thanks.  This looks about right to me, except that "run&" is not the
> only command whose side effect is that the debuggee is running in the
> background mode.  We also need to at least consider "attach&", I
> think.  Maybe it would be useful to have a list of such commands, so
> that we could expand it as needed in the future, because currently I
> don't really understand what triggers background execution that causes
> "-list-target-features" to report "async".  It sounds possible that
> this happens only after the first command that ends with "&", in which
> case we will need to add to the list all the commands mentioned in the
> "Background Execution" node of the GDB manual.  This affects the test
> below:
>

Thanks for your comments.I think what exactly the value of
`gdb-last-command’ is not essential for us.
We just need to know  whether `gdb-last-command' is a CLI command in
the background or a MI command,
since here we have already got its "running" status.  We must check
the target "async" feature after stopping
the debuggee at the first time in function `gdb-stopped' if
`gdb-last-command' is not a background CLI command or a MI command.

> > +  ;; Set `gdb-non-stop` when `gdb-last-command` is a CLI background
> > +  ;; `run` command e.g. r& or MI command `-exec-run`
> > +  (when (or (string-match "&\s*$" gdb-last-command)
> > +            (string-match "-exec-run" gdb-last-command))
> > +    (gdb-try-check-target-async-support))
>
> And I'm not sure I understand the idea behind this part:
>
> > @@ -2722,6 +2744,9 @@ gdb-stopped
> >
> >      ;; Print "(gdb)" to GUD console
> >      (when gdb-first-done-or-error
> > +      ;; If run target with CLI foreground command `run`, `target
> > +      ;; async` can only be checked when target is stopped
> > +      (gdb-try-check-target-async-support)
> >        (setq gdb-filter-output (concat gdb-filter-output gdb-prompt-name)))
>
> Can you elaborate?

Thanks for your questions, according to my comments above, If the
debuggee has been started by
a non-background CLI command e.g. “run" or "attach" (no trailing "&")
commands, we can only
check the target "async" feature at the code stack.

>
> Finally, please don't quote symbols `like this` in comments.  Our
> conventions are to quote symbols 'like this' or `like this'.

I updated the patch, see the attachment.

gdb-mi-support-non-stop-v2.patch
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