[PATCH] riscv: Add glibc-hwcaps support

[David Abdurachmanov]

On Tue, May 2, 2023 at 5:39 PM Palmer Dabbelt <palmer@rivosinc.com> wrote:
>
> On Tue, 02 May 2023 00:22:39 PDT (-0700), fweimer@redhat.com wrote:
> > * Palmer Dabbelt:
> >
> >> So maybe the best answer here is to just wait a bit?
> >
> > Yes, it will likely get easier over time because the patterns in CPU
> > support will become clearer.  You might not even have to wait ten to
> > fifteen years.
>
> Hopefully ;)
>
> >> When I'd seen OpenSUSE pick it up it seemed like the way folks were
> >> going, but some other distros (Fedora, for example) seemed to be more
> >> interested in just having multiple system images.
> >
> > I'm not sure where you got the idea that Fedora would build multiple
> > system images with different library code.  Currently, there are no
> > spins that rebuild packages.  And RISC-V for Fedora remains challenging.
>
> +David, who was telling me the plan was to have rv64gc images and rva23
> images as independent system images.  Or at least I think that's what he
> was saying, sorry if I misunderstood.

We don't have a plan set in stone today, but we do have opinions.
Simply put mine would be:
- Fedora/RISCV as-is (RV64GC stuff) continues to exist to support
folks with existing hardware (the only existing hardware) today. I
call it legacy.
- Have a separate arch for a new variant (RVA23, or whatever next
major profile is announced). Also depends on what the Platforms
specification will do. We want to get closer to specification
compliant hardware support.