bug#23720: 25.0.94; Issues with GUD (gdb-mi) after upgrade from Emacs 23 to 24/25

[Guilhem Bichot]

Eli Zaretskii a écrit le 09/06/2016 16:12 :
> > Cc: 23720@debbugs.gnu.org
> > From: Guilhem Bichot <guilhem.bichot@oracle.com>
> > Date: Thu, 9 Jun 2016 15:46:50 +0200
> >
> > > Like I said, I believe this is because your program is running.
> >
> > It is not running. I can repeat the problem when the display is:
> > Breakpoint 1, JOIN::exec (this=0x7fff70008770) at
> > /home/mysql_src/git/cte/sql/sql_executor.cc:113
> > 113     {
> > (gdb)
> >
> > which very much suggests the program is currently stopped (thus, not
> > running). At that point, I can open another file, and put the cursor on
> > a line of that file, and:
> > - C-x C-a C-b does set the breakpoint (another hint that the program
> > isn't stopped).
> > - C-x SPC and clicking on the fringe, don't. In emacs23 they do.
> >
> > In other words, gdb-mi sees manually-opened-files as "not my business I
> > won't offer my shortcuts there", while gud-gdb sees it differently. The
> > latter is more convenient.
> >
> > It is not possible to know in advance all the breakpoints one will need
> > and set them all before "run"...
>
> Ah, okay, I've misunderstood you, sorry.  Yes, this is how stuff works
> with gdb-mi.

Ok. So, apparently, gdb-mi has a set of "source files it has visited" 
and treats other source files differently.

> > ok, now we agree there's a STOP button in emacs24.
> >
> >     (gdb) help interrupt
> >     Interrupt the execution of the debugged program.
> >
> > So, shouldn't this STOP button interrupt my debugged, running program
> > (mysql)?
> > Pressing this STOP button in emacs23 does interrupt it.
> > It doesn't anymore in emacs24.
> > Is it considered normal?
>
> I don't think so, but I don't have any more wisdom to offer about
> this.  AFAIU, -exec-interrupt should have interrupted your program,
> unless it masks signals.

I see. When I find the time, I'll try diff-ing the code of gud-gdb and 
of gdb-mi to find what magic the gud-gdb STOP button has, which makes it 
have "a stronger interruption effect".
If I find anything, I'll report it here.

Thanks for your help!