Re: [gentoo-dev] Re: New global USE flag "neon" for ARM NEON optimization(s)

[Arfrever Frehtes Taifersar Arahesis]

2012-01-18 12:37:12 Mike Frysinger napisał(a):
> On Friday 23 December 2011 11:44:32 Duncan wrote:
> > Matt Turner posted on Fri, 23 Dec 2011 08:09:30 -0500 as excerpted:
> > > to avoid confusion I'd suggest arch-neon or arm-neon (or armneon/
> > >> archneon) if it's to be a global flag.
> > >
> > > NEON (the SIMD extensions) are turned on by the neon flag much more
> > > often than support for net-libs/neon is. Let's not rename USE flags like
> > > this.
> >
> > I'd argue that the library is far more frequently used, given that it's
> > used across archs and arm is (for the time being, that seems to be
> > gradually changing) still a rather obscure arch (for end-user installed
> > distros, anyway), so the neon library is likely the most frequently used.
> >
> > However you are probably correct about the USE flag, as the library usage
> > seems to be required in many cases and thus not USE-flaggable.
> >
> > So I'd still argue that to prevent confusion... but it's not something I
> > feel strongly about, so given no one else objecting, use=neon for the simd
> > extensions works as a global USE flag, and if it's ever used for the net-
> > lib, that one can change I guess.
>
> if we're going to arch namespace flags, we should do it for all of them.  i
> probably wouldn't complain about that (although i'd prefer more of an ISA
> prefix than Gentoo $ARCH), but doing it for one flag is not nice.
>
> i agree that for some users, they've never heard of the the ARM NEON
> extensions, but they have heard of the neon library.  i'd counter that with a
> few points: (1) i don't think there are any packages in the tree that have
> optional neon (the library) support

http://qa-reports.gentoo.org/output/genrdeps/rindex/net-libs/neon lists 6 packages, which optionally
depend on net-libs/neon.

-- 
Arfrever Frehtes Taifersar Arahesis