[PATCH] ARM: makefile: pass -march=armv4 to assembler even on CPU32v3

Hi Ard,

On Tue, Oct 2, 2018 at 5:54 AM Ard Biesheuvel [off-list ref] wrote:

So Arnd's suggestion to switch to armv3-m would actually be feasible
then? The code in question does not use ldrh only umull, and so it
should build with armv3m as well. And we will even generate some
better code for RiscPC if we apply it to both the cflags and the
asflags.

It turns out armv3m isn't a solution for the crypto code, since it
does other armv4-isms. So we'll need to find another solution for
that; I'm partial to my initial Kconfig one just doing "depends
!CPU_32V3".

With regards to RiscPC though, given that armv3 codegen might be
better, it sounds like it's a good idea to set -march=armv3m anyway
for the platform, irrespective of fixing the problem at hand here.

Regards,
Jason