[PATCH] aarch64: update NEWS about branch protection

[Szabolcs Nagy]

The 07/29/2020 10:11, Florian Weimer wrote:
> * Szabolcs Nagy:
> 
> > diff --git a/NEWS b/NEWS
> > index 1ef4a0a7a4..0e6ad5edc4 100644
> > --- a/NEWS
> > +++ b/NEWS
> > @@ -70,7 +70,9 @@ Major new features:
> >  
> >  * AArch64 now supports standard branch protection security hardening
> >    in glibc when it is built with a GCC that is configured with
> > -  --enable-standard-branch-protection.  This includes branch target
> > +  --enable-standard-branch-protection (or if -mbranch-protection=standard
> > +  flag is passed when building both GCC target libraries and glibc,
> > +  in either case a custom GCC is needed).  This includes branch target
> >    identification (BTI) and pointer authentication for return addresses
> >    (PAC-RET).  They require armv8.5-a and armv8.3-a architecture
> >    extensions respectively for the protection to be effective,
> 
> Please clarify if you need to pass the flags in CFLAGS or CC for glibc.
> Thanks.

cflags is enough, but it is hard to tell what
the glibc build system does with the various
cflags.

if i simply override CFLAGS i get
# error "glibc cannot be compiled without optimization"