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15.20.9700.010; Mon, 9 Mar 2026 16:54:00 +0000 Content-Type: multipart/alternative; boundary="------------f4TZesOwfvaE8bHiuE7u08OL" Message-ID: <2e0e0fda-248c-4018-a9d1-2c6679560e2c@windriver.com> Date: Mon, 9 Mar 2026 22:23:48 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [OE-core] [PATCH v7 01/14] linux-yocto: conditionally add clang/rust/bindgen-cli-native to DEPENDS To: Bruce Ashfield Cc: Richard Purdie , openembedded-core@lists.openembedded.org, Randy.MacLeod@windriver.com, Sundeep.Kokkonda@windriver.com, paul@pbarker.dev, yoann.congal@smile.fr References: <20260304174324.1186644-1-Harish.Sadineni@windriver.com> <20260304174324.1186644-2-Harish.Sadineni@windriver.com> <22371edb-5575-4636-88cc-462d0b19646c@windriver.com> Content-Language: en-US From: Harish Sadineni In-Reply-To: X-ClientProxiedBy: MA5P287CA0108.INDP287.PROD.OUTLOOK.COM (2603:1096:a01:1b5::16) To PH0PR11MB5658.namprd11.prod.outlook.com (2603:10b6:510:e2::23) MIME-Version: 1.0 X-MS-PublicTrafficType: Email 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definitions=2026-03-09_04,2026-03-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 spamscore=0 phishscore=0 malwarescore=0 suspectscore=0 priorityscore=1501 clxscore=1015 adultscore=0 bulkscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603090152 List-Id: X-Webhook-Received: from 45-33-107-173.ip.linodeusercontent.com [45.33.107.173] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Mon, 09 Mar 2026 16:54:14 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/232730 --------------f4TZesOwfvaE8bHiuE7u08OL Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by mx0a-0064b401.pphosted.com id 629GfOk11025889 On 3/9/2026 9:59 PM, Bruce Ashfield wrote: > ** > *CAUTION: This email comes from a non Wind River email account!* > Do not click links or open attachments unless you recognize the sender=20 > and know the content is safe. > > > On Mon, Mar 9, 2026 at 12:10=E2=80=AFPM Harish Sadineni=20 > wrote: > > > On 3/9/2026 4:56 PM, Richard Purdie wrote: >> CAUTION: This email comes from a non Wind River email account! >> Do not click links or open attachments unless you recognize the se= nder and know the content is safe. >> >> On Wed, 2026-03-04 at 09:43 -0800, Sadineni, Harish vialists.opene= mbedded.org wrote: >>> From: Harish Sadineni >>> >>> Conditionally add 'clang-native', 'rust-native' and 'bindgen-cli-= native' to 'DEPENDS' >>> when Kernel Rust Support is enabled. >>> >>> These tools are required for building Rust-enabled kernels and fo= r >>> generating Rust FFI bindings via bindgen during the kernel build. >>> >>> This ensures the additional dependencies are only pulled in when >>> Rust support is explicitly enabled, avoiding unnecessary native >>> dependencies for non-Rust kernel builds. >>> >>> Signed-off-by: Harish Sadineni >>> --- >>> meta/recipes-kernel/linux/linux-yocto.inc = | 3 +++ >>> 1 file changed, 3 insertions(+) >>> >>> diff --git a/meta/recipes-kernel/linux/linux-yocto.inc b/meta/recipes-kernel/linux/linux-yocto.inc >>> index 4d0a726bb6..b7961bbcdf 100644 >>> --- a/meta/recipes-kernel/linux/linux-yocto.inc >>> +++ b/meta/recipes-kernel/linux/linux-yocto.inc >>> @@ -76,11 +76,14 @@ do_install:append(){ >>> KERNEL_FEATURES:append:qemuall =3D " features/kernel-sample/ker= nel-sample.scc" >>> >>> KERNEL_DEBUG ?=3D "" >>> +KERNEL_RUST_SUPPORT ?=3D "" >>> # These used to be version specific, but are now common depende= ncies. New >>> # tools / dependencies will continue to be added in version spe= cific recipes. >>> DEPENDS +=3D '${@bb.utils.contains_any("ARCH", [ "x86", "arm64"= , "powerpc" ], "elfutils-native", "", d)}' >>> DEPENDS +=3D "openssl-native util-linux-native" >>> DEPENDS +=3D "gmp-native libmpc-native" >>> +RUST_KERNEL_DEPENDS ?=3D"${@bb.utils.contains('KERNEL_RUST_SUPPO= RT', 'True', >>> 'clang-native rust-native bindgen-cli-native', '', d)}" >>> +DEPENDS +=3D "${RUST_KERNEL_DEPENDS}" >>> >>> # Some options depend on CONFIG_PAHOLE_VERSION, so need to make= pahole-native available before do_kernel_configme >>> do_kernel_configme[depends] +=3D '${@bb.utils.contains("KERNEL_= DEBUG", "True", "pahole-native:do_populate_sysroot", "", d)}' >> I thought we were going to try and use KERNEL_FEATURES for this? > Hi Richard, > > I have tried this but i got circular dependency error with > KERNEL_FEATURES. So, I opted using variable KERNEL_RUST_SUPPORT. > > > I'm curious about that. Can you share the details ? (diff and the=20 > bitbake error) As discussed previously, I attempted to use the following in=20 meta/recipes-kernel/linux/linux-yocto_6.18.bb: KERNEL_FEATURES:append =3D " ${@bb.utils.contains('KERNEL_FEATURES',=20 'rust-kernel', ' features/kernel-rust/kernel-rust.scc', '', d)}" This resulted in a BitBake variable dependency chain failure. The issue=20 occurs because the expression is trying to read KERNEL_FEATURES while simultaneously modifying KERNEL_FEATURES, which creates a circular=20 dependency. example: =C2=A0The variable dependency chain for the failure is: KERNEL_FEATURES = ->=20 KERNEL_FEATURES -> KERNEL_FEATURES -> KERNEL_FEATURES... Thanks, Harish > > Bruce > >> The implementation of KERNEL_RUST_SUPPORT is problematic as it onl= y >> works for the value of "True", not "true", or "1" or 1 or any othe= r >> thing people might dream up. "Contains" isn't really an appropriat= e >> mechanism for a boolean either. >> >> You can use bb.utils.to_boolean() as a way to better obtain a bool= ean >> value from a random variable. > Understood, Earlier i took reference from the code that already > present in that file. > I have updated the code we will send v8. > > Thanks, > Harish >> Cheers, >> >> Richard >> >> >> >> >> > > > --=20 > - Thou shalt not follow the NULL pointer, for chaos and madness await=20 > thee at its end > - "Use the force Harry" - Gandalf, Star Trek II > --------------f4TZesOwfvaE8bHiuE7u08OL Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by mx0a-0064b401.pphosted.com id 629GfOk11025889


On 3/9/2026 9:59 PM, Bruce Ashfield wrote:
=20
CAUTION: This email comes from a non Wind River email account!
Do not click links or open attachments unless you recognize the sender and know the content is safe.


On Mon, Mar 9, 2026 at 12:10=E2=80=AFPM Harish Sadineni <Harish.Sadineni@windriver.com> wrote:


On 3/9/2026 4:56 PM, Richard Purdie wrote:
CAUTION: This email comes from a non Wind River em=
ail account!
Do not click links or open attachments unless you recognize the sender an=
d know the content is safe.

On Wed, 2026-03-04 at 09:43 -0800, Sadineni, Harish via lists.open=
embedded.org wrote:

From: Harish Sadineni <Har=
ish.Sadineni@windriver.com>

Conditionally add 'clang-native', 'rust-native' and 'bindgen-cli-native' =
to 'DEPENDS'
when Kernel Rust Support is enabled.

These tools are required for building Rust-enabled kernels and for
generating Rust FFI bindings via bindgen during the kernel build.

This ensures the additional dependencies are only pulled in when
Rust support is explicitly enabled, avoiding unnecessary native
dependencies for non-Rust kernel builds.

Signed-off-by: Harish Sadineni <Harish.Sadineni@win=
driver.com>
---
 meta/recipes-kernel/linux/linux-yocto.inc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/meta/recipes-kernel/linux/linux-yocto.inc b/meta/recipes-kernel/linux/linux-yocto.inc
index 4d0a726bb6..b7961bbcdf 100644
--- a/meta/recipes-kernel/linux/linux-yocto.inc
+++ b/meta/recipes-kernel/linux/linux-yocto.inc
@@ -76,11 +76,14 @@ do_install:append(){
 KERNEL_FEATURES:append:qemuall =3D " features/kernel-sample/kernel-=
sample.scc"

 KERNEL_DEBUG ?=3D ""
+KERNEL_RUST_SUPPORT ?=3D ""
 # These used to be version specific, but are now common dependencies.  N=
ew
 # tools / dependencies will continue to be added in version specific rec=
ipes.
 DEPENDS +=3D '${@bb.utils.contains_any("ARCH", [ "x86&quo=
t;, "arm64", "powerpc" ], "elfutils-native"=
, "", d)}'
 DEPENDS +=3D "openssl-native util-linux-native"
 DEPENDS +=3D "gmp-native libmpc-native"
+RUST_KERNEL_DEPENDS ?=3D "${@bb.utils.contains=
('KERNEL_RUST_SUPPORT', 'True', 'clang-native rust-native bindgen-cli-nat=
ive', '', d)}"
+DEPENDS +=3D "${RUST_KERNEL_DEPENDS}"

 # Some options depend on CONFIG_PAHOLE_VERSION, so need to make pahole-n=
ative available before do_kernel_configme
 do_kernel_configme[depends] +=3D '${@bb.utils.contains("KERNEL_DEBU=
G", "True", "pahole-native:do_populate_sysroot",=
 "", d)}'

I thought we were going to try and use KERNEL_FEAT=
URES for this?
Hi Richard,

I have tried this but i got circular dependency error with KERNEL_FEATURES. So, I opted using variable KERNEL_RUST_SUPPORT.

I'm curious about that. Can you share the details ? (diff and the bitbake error)

As discussed previously, I attempted to use the following in meta/recipes-kernel/linux/linux-yocto_6.18.bb:

KERNEL_FEATURES:append =3D " ${@bb.utils.contains('KERNEL_FEATUR= ES', 'rust-kernel', ' features/kernel-rust/kernel-rust.scc', '', d)}"=

This resulted in a BitBake variable dependency chain failure. The issue occurs because the expression is trying to read KERNEL_FEATURES
while simultaneously modifying KERNEL_FEATURES, which creates a circular dependency.

example:
 The variable dependency chain for the failure is: KERNEL_FEATUR= ES -> KERNEL_FEATURES -> KERNEL_FEATURES -> KERNEL_FEATURES...<= br>
Thanks,
Harish

Bruc= e

 
The implementation of KERNEL_RUST_SUPPORT is probl=
ematic as it only
works for the value of "True", not "true", or "1=
" or 1 or any other
thing people might dream up. "Contains" isn't really an appropr=
iate
mechanism for a boolean either.

You can use bb.utils.to_boolean() as a way to better obtain a boolean
value from a random variable.
Understood, Earlier i took reference from the code that already present in that file.
I have updated the code we will send v8.

Thanks,
Harish
Cheers,

Richard


--
- Thou shalt not fol= low the NULL pointer, for chaos and madness await thee at its end
- "Use the force Harry" - Gandalf, Star Trek II

--------------f4TZesOwfvaE8bHiuE7u08OL--