On Fri, Jul 11, 2025 at 2:33 PM Siddhesh Poyarekar <siddh...@gotplt.org> wrote:
>
> On 2025-07-08 18:07, Sam James wrote:
> >> OK in principle, but please allow some time for distro maintainers
> >> (CC'd) to voice their opinion.
> >
> > It looks good to me and I plan on us using it. I'd like opinions from
> > one other group first before it goes in if possible though, as our
> > perspective is different from others (e.g. we don't have to worry about
> > old enterprise deployments).
>
> Why not just switch over unconditionally? __fentry__ seems like a
> better alternative to mcount overall and it has been around long enough
> that even older deployments should be relatively unaffected.
Actually, it is switched on by default for i?86-*-linux* |
x86_64-*-linux*. The default for --enable-x86-64-mfentry is "auto",
which triggers the mentioned condition. One still has a chance to use
"yes" or "no" in addition to "auto" when configuring with
--{enable|disable}-x86-64-mfentry.
Uros.
