[llvm-dev] [RFC] Making -mcpu=generic the default for ARM armv7a and arm8a rather than -mcpu=cortex-a8 or -mcpu=cortex-a53

[Mark Kettenis via llvm-dev]

> Date: Wed, 31 May 2017 10:23:14 -0500
> From: Evandro Menezes via llvm-dev <llvm-dev at lists.llvm.org>
> 
> On 05/31/2017 08:35 AM, Renato Golin wrote:
> > On 31 May 2017 at 13:57, Kristof Beyls <Kristof.Beyls at arm.com> wrote:
> >> Taking into account the above measurements, my conclusions are:
> >> 1. We should make -mcpu=generic the default cpu, not Cortex-A8 or Cortex-A53
> >> for march=armv7a and march=armv8a.
> > Using -mcpu=native makes more sense to me, if at all possible to
> > detect, falling back to generic, which doesn't hurt.
> 
> For the sake of predictability, methinks that it'd make more sense for 
> the default to always mean the same thing for everyone, as Kristof 
> suggested.

Seconded.  Predictable builds are pretty important for us on OpenBSD,
as people regularly do their own (native) builds of the complete OS on
different kinds of hardware.