Re: [RFC] checking the Z-packet suppport on gdbserver

[Jim Blandy <jimb@codesourcery.com>]

Emi SUZUKI <emi-suzuki@tjsys.co.jp> writes:
> GDB decides which type of watchpoints should be set when giving the
> command like "watch foo".  And hardware watchpoints can be used when
> gdbserver has the Z-packet support.  However, as the session log above
> has shown, GDB does not check the Z-packet support on gdbserver when
> deciding the type of the watchpoint but when actually setting the
> watchpoint to the target.  

Yeah, this is pretty losing behavior on GDB's part.

> Would anyone give me any comments how it should be treated as a whole?
> Defines another packet for it?  Applies as proposed and notes "it
> might not work with older versions of gdbserver" ?

I wonder, would it make sense to have GDB assume that hardware
watchpoints are *not* available on remote targets, and then have
gdbserver send a 'qSupported' packet stubfeature that tells GDB that
hardware watchpoints are okay?