Re: Cannot execute this command without a live selected thread.

[Sandra Loosemore <sandra at codesourcery dot com>]

On 10/24/2014 11:23 AM, Pedro Alves wrote:
> On 10/24/2014 06:07 PM, Sandra Loosemore wrote:
> > Sending packet: $?#3f...Packet received: S00
> > Sending packet: $qfThreadInfo#bb...Packet received: l
>
> Huh, I think this is the problem.
>
> So this target supports qfThreadInfo, but then it's returning
> an empty thread list...  remote_update_thread_list will delete
> threads from GDB's list that are not found in the thread list that
> the target reported.  Why is the target reporting that empty list?

I dug around in the svn history for our stub library.   We made that 
change to the thread packet handling because if it returned an empty 
response to qfThreadInfo instead, GDB persistently complained:

warning: RMT ERROR : failed to get remote thread list.

especially when being run from Eclipse.

It seemed then that debugging worked OK in spite of the warnings, but 
the messages looked both frightening and incomprehensible to users. 
This was back in 2010, so maybe GDB doesn't do that any more.

-Sandra