Re: [PATCH] Make only user-specified executable filenames sticky

[Doug Evans <dje at google dot com>]

On Wed, May 6, 2015 at 3:26 AM, Gary Benson <gbenson@redhat.com> wrote:
> Hi all,
>
> In GDB some executable files are supplied by the user (e.g. using a
> "file" command) and some are determined by GDB (e.g. while processing
> an "attach" command).  GDB will not attempt to determine a filename if
> one has been set.  This causes problems if you attach to one process
> and then attach to another: GDB will not attempt to discover the main
> executable on the second attach.  If the two processes have different
> main executable files then the symbols will now be wrong.
>
> This commit updates GDB to keep track of which executable filenames
> were supplied by the user.  When GDB might attempt to determine an
> executable filename and one is already set, filenames determined by
> GDB may be overridden but user-supplied filenames will not.

Hi.

I can imagine sometimes wanting either behaviour, depending on
the situation.
E.g., if I supply a file name do some stuff, and then change
my mind or wish to investigate a difference process I may
wish gdb to automagically pick up the file name of the new process.
OTOH other times I may wish to override what gdb would
automagically choose and supply my own file name.

This suggests having an option to the command to choose
the behaviour one wants (I'd hate a global switch for this).
This doesn't have to be added today of course.
I only bring this up in case a behavioural change
is being introduced (it doesn't appear so, but I could be wrong),
in which case now is a good time to discuss it.

My main reason for sending this message, though, is that
I think a notification to the user is warranted here.
E.g., something like
"Using xyz for the symbol file name, since that's
what you specified. If this is wrong, please do [...]."
or whatever. Just something so that the user knows
gdb is not automagically picking the file.