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

[Pedro Alves <palves@redhat.com>]

On 05/12/2015 04:49 PM, Doug Evans wrote:
> On Tue, May 12, 2015 at 3:36 AM, Pedro Alves <palves@redhat.com> wrote:
>> On 05/11/2015 09:23 PM, Doug Evans wrote:
>>> On Wed, May 6, 2015 at 3:26 AM, Gary Benson <gbenson@redhat.com> wrote:
>>
>>>> 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.
>>>
>>> I can imagine sometimes wanting either behaviour, depending on
>>> the situation.
>>
>> Yeah, AFAICS, both examples you gave work the same before
>> and after Gary's patch.
>>
>>> 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.
>>
>> In that case, one can use "file; attach PID".
>>
>> That is, you can just unload the previous program, so that GDB picks
>> up the new one automatically on next attach.
> 
> I realize one *could* do that.
> Thing is, someone's muscle memory may make them expect
> "attach PID" to Just Work.
> After all, "bash$ gdb" + "(gdb) attach PID" Just Works.
> 
> Plus that's two steps.
> Why do I *have* to first type "file" with no arguments?
> (Joe User may be thinking)
> The difference in the two scenarios is explainable, but there's
> still an incongruity here.
> 
> We go to lengths to reduce typing in the CLI session.
> IWBN if one could type, say,
> "attach -f PID" (f for "force gdb to use the binary of the attached process",
> or whatever).

We're kind of going on a tangent now.  While I agree
that streamlining the sequence of commands is desirable,
I don't think it fixes the issue with muscle memory you raise.
For the very same reason, you'll forget to use "attach -f PID"
instead of "attach PID".  A warning (or query but that may be
annoying) may be the best bet for that.

Thanks,
Pedro Alves