Re: patch to add QNX NTO i386 support

[Andrew Cagney <ac131313@redhat.com>]

>>    The only way to tell that we're targetting a qnx binary will be when
>>    someone types 'target qnx ...'.  Is it acceptable to have the
>>    gdbarch stuff come into play when someone does that targetting?
>>
>> I'm not sure.  If the "qnx" protocol implies that the OS/ABI is QNX,
>> this would make sense to me, but there are other people on this list
>> that could judge better.
> 
> 
> You're right about this.  It's unlikely that anyone else would use our qnx
> pdebug protocol for remote debugging but one of my future projects is to
> port the gdbserver to Neutrino.  People wouldn't necessarily need to use
> pdebug but in this case, there would really be no way of knowing the ABI
> other than having a default set.

FYI,

A long term objective of GDB is to get the sequence:

$ gdb
(gdb) target remote who-knows-what-we-debugging:47
Connected to target who-knows-what-we-debugging.
Architecture set to now-we-know.
(gdb) info registers
... display of now-we-know architecture's registers ...
(gdb)

This involves the target supplying the thread's architecture via the 
target stack ....

Andrew