[Regression] [PATCH] Do not print empty-group regs when printing general ones

[Christian Biesinger via gdb-patches]

On Fri, Feb 28, 2020 at 7:08 AM Luis Machado <luis.machado@linaro.org> wrote:
>
> On 1/31/20 7:34 AM, Shahab Vahedi wrote:
> > This patch was reviewed once (as OK):
> > https://sourceware.org/ml/gdb-patches/2020-01/msg00613.html
> >
> > Could someone review/merge it?
> >
> >
> > Cheers,
> > Shahab
> >
>
> FTR, this has broken general register printing for ARM/AArch64. Now
> "info reg" shows nothing.
>
> Given there are already remote stubs, probes and gdbservers running out
> there, this is an undesirable change to have.
>
> I had an IRC chat with Christian and he pointed me at some documentation
> stating empty-group registers should not be printed, but i think this is
> a case where the implementation has diverged from the documentation.
>
> https://sourceware.org/gdb/current/onlinedocs/gdb/Target-Description-Format.html#Target-Description-Format
>
> We could probably patch up any non-standard target description XML's
> from now on, but the existing behavior may have to be preserved.

Most targets under features/ do not specify group="general" in their
XML files for anything (only S/390 does); it seems like that should
maybe be fixed either way?

Christian