[Rd] enabling core dumps

[pleydell at supagro.inra.fr]

> ... If I launch gdb this way I don't have any means to navigate through
> previously executed gdb lines using M-p and M-n, but following a
> (gdb) run
> or
> (gdb) continue
> I can use M-p and M-n to recall previous R commands
>
> If I launch gdb in other ways M-p and M-n function as expected. I 
> suppose there
> is a confusion between gdb's M-p and ESS's M-p so that M-p only functions in
> the ESS session.
>
> I quite like running gdb using R's -d flag, but not being able to navigate
> through the line history is sub-optimal. I'd be interested to hear if other
> people running gdb this way encountered this problem and how they 
> resolved it.

This had a one line solution (section 19.3, page 216, gdb manual)

gdb> set history save on