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 (2) people are good at reading `quse -D neon` (3) the flag is masked everywhere except for ARM ports, so people can't really bite themselves. -mike
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