Re: [Xen-devel] [PATCH v5 03/10] x86: determine HAVE_AS_* just once

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 24/03/2020 12:33, Jan Beulich wrote:
> With the exception of HAVE_AS_QUOTED_SYM, populate the results into a
> generated header instead of (at least once per [sub]directory) into
> CFLAGS. This results in proper rebuilds (via make dependencies) in case
> the compiler used changes between builds. It additionally eases
> inspection of which assembler features were actually found usable.
>
> Some trickery is needed to avoid header generation itself to try to
> include the to-be/not-yet-generated header.
>
> Since the definitions in generated/config.h, previously having been
> command line options, might even affect xen/config.h or its descendants,
> move adding of the -include option for the latter after inclusion of the
> per-arch Rules.mk. Use the occasion to also move the most general -I
> option to the common Rules.mk.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Given the work of Anthony's which is already committed in staging, I'd
really prefer this patch to look something like
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=WIP.x86/asm&id=95ef9f80ed6359e89f988121521c421b7e9528de

That avoids all fragile games with includes, and is the position we want
to be in, longterm.

All the requisite infrastructure looks to be already present.

~Andrew