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From: Joyce Kong <Joyce.Kong@arm.com>
To: Stephen Hemminger <stephen@networkplumber.org>
CC: "thomas@monjalon.net" <thomas@monjalon.net>, Ruifeng Wang
<Ruifeng.Wang@arm.com>, "bruce.richardson@intel.com"
<bruce.richardson@intel.com>, "dev@dpdk.org" <dev@dpdk.org>, nd <nd@arm.com>,
"stable@dpdk.org" <stable@dpdk.org>
Subject: RE: [PATCH v4 1/2] config: correct cpu instruction set for cross build
Thread-Topic: [PATCH v4 1/2] config: correct cpu instruction set for cross
build
Thread-Index: AQHaJy6jMXYrxG2mUk2eMsg68Wj5QLCebpaAgAA6jBA=
Date: Fri, 8 Dec 2023 02:51:17 +0000
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Errors-To: dev-bounces@dpdk.org
> -----Original Message-----
> From: Stephen Hemminger <stephen@networkplumber.org>
> Sent: Friday, December 8, 2023 6:41 AM
> To: Joyce Kong <Joyce.Kong@arm.com>
> Cc: thomas@monjalon.net; Ruifeng Wang <Ruifeng.Wang@arm.com>;
> bruce.richardson@intel.com; dev@dpdk.org; nd <nd@arm.com>;
> stable@dpdk.org
> Subject: Re: [PATCH v4 1/2] config: correct cpu instruction set for cross=
build
>=20
> On Tue, 5 Dec 2023 03:52:58 +0000
> Joyce Kong <joyce.kong@arm.com> wrote:
>=20
> > The platform value would be 'native' only when not cross build.
> > Move the operation about modifying cpu_instruction_set while platform
> > equals 'native' to the not cross build branch.
> >
> > Fixes: bf66003b51ec ("build: use platform for generic and native
> > builds")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Joyce Kong <joyce.kong@arm.com>
> > Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
>=20
> Looks right, what is the impact on existing users doing current cross bui=
lds?
The original operation changes cpu_instruction_set to 'native' when both 'p=
latform =3D=3D native' and 'cpu_instruction_set =3D=3D auto'.
There was no impact on the existing users for current cross build, as the c=
ross files set cpu field to a specific arch, such as 'armv8-a', and this di=
dn't trigger the modification for cpu_instruction_set.
However, if we want to use a common arch in cross files like 'auto', the mo=
dification operation would override 'native' value to cpu_instruction_set a=
nd b7676fcccab4 ("config: verify machine arch flag") would break the build =
as it tries to test -march=3Dnative.
>=20
> Acked-by: Stephen Hemminger <stephen@networkplumber.org>