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

From: Guilhem Bichot
Subject: bug#23720: 25.0.94; Issues with GUD (gdb-mi) after upgrade from Emacs 23 to 24/25
Date: Thu, 9 Jun 2016 16:30:16 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0

Eli Zaretskii a écrit le 09/06/2016 16:12 :
Cc: address@hidden
From: Guilhem Bichot <address@hidden>
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
113     {

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
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!

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