[PATCH] x86: Document -fcf-protection requires i686 or newer

[H.J. Lu]

On Thu, Oct 21, 2021 at 12:04 PM Uros Bizjak <ubizjak@gmail.com> wrote:
>
> On Thu, Oct 21, 2021 at 6:47 PM H.J. Lu <hjl.tools@gmail.com> wrote:
> >
> >         PR target/98667
> >         * doc/invoke.texi: Document -fcf-protection requires i686 or
> >         new.
>
> Obvious patch?

I am checking it in and backporting it to release branches.

Thanks.

> Uros.
>
> > ---
> >  gcc/doc/invoke.texi | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
> > index c66a25fcd69..71992b8c597 100644
> > --- a/gcc/doc/invoke.texi
> > +++ b/gcc/doc/invoke.texi
> > @@ -15542,7 +15542,8 @@ which functions and calls should be skipped from instrumentation
> >  (@pxref{Function Attributes}).
> >
> >  Currently the x86 GNU/Linux target provides an implementation based
> > -on Intel Control-flow Enforcement Technology (CET).
> > +on Intel Control-flow Enforcement Technology (CET) which works for
> > +i686 processor or newer.
> >
> >  @item -fstack-protector
> >  @opindex fstack-protector
> > --
> > 2.32.0
> >



-- 
H.J.