Re: [PATCH 09/11] x86: rework CONFIG_GENERIC_CPU compiler flags

[Andy Shevchenko]

On Thu, Dec 05, 2024 at 11:09:41AM +0100, Arnd Bergmann wrote:
> On Thu, Dec 5, 2024, at 09:13, Andy Shevchenko wrote:
> > On Wed, Dec 04, 2024 at 03:33:19PM -0800, Linus Torvalds wrote:
> >> On Wed, 4 Dec 2024 at 11:44, Arnd Bergmann <arnd@xxxxxxxx> wrote:

...

> >> Will that work when you cross-compile? No. Do we care? Also no. It's
> >> basically a simple "you want to optimize for your own local machine"
> >> switch.
> >
> > Maybe it's okay for 64-bit machines, but for cross-compiling for 32-bit on
> > 64-bit. I dunno what '-march=native -m32' (or equivalent) will give in such
> > cases.
> 
> From the compiler's perspective this is nothing special, it just
> builds a 32-bit binary that can use any instruction supported in
> 32-bit mode of that 64-bit CPU,

But does this affect building, e.g., for Quark on my Skylake desktop?

> the same as the 32-bit CONFIG_MCORE2 option that I disallow in patch 04/11.

-- 
With Best Regards,
Andy Shevchenko