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15.20.9700.010; Mon, 9 Mar 2026 16:09:57 +0000 Content-Type: multipart/alternative; boundary="------------ksYwiQHhrYpVfVkl2HxQtofK" Message-ID: <22371edb-5575-4636-88cc-462d0b19646c@windriver.com> Date: Mon, 9 Mar 2026 21:39:34 +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: Richard Purdie , openembedded-core@lists.openembedded.org Cc: Randy.MacLeod@windriver.com, Sundeep.Kokkonda@windriver.com, paul@pbarker.dev, yoann.congal@smile.fr, Bruce Ashfield References: <20260304174324.1186644-1-Harish.Sadineni@windriver.com> <20260304174324.1186644-2-Harish.Sadineni@windriver.com> Content-Language: en-US From: Harish Sadineni In-Reply-To: X-ClientProxiedBy: MA1PR01CA0183.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a01:d::6) To PH0PR11MB5658.namprd11.prod.outlook.com (2603:10b6:510:e2::23) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: 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impostorscore=0 phishscore=0 priorityscore=1501 bulkscore=0 adultscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603090146 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 16:10:14 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/232728 --------------ksYwiQHhrYpVfVkl2HxQtofK Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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 sender and know the content is safe. > > On Wed, 2026-03-04 at 09:43 -0800, Sadineni, Harish via lists.openembedded.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 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 >> --- >> 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 = " features/kernel-sample/kernel-sample.scc" >> >> KERNEL_DEBUG ?= "" >> +KERNEL_RUST_SUPPORT ?= "" >> # These used to be version specific, but are now common dependencies. New >> # tools / dependencies will continue to be added in version specific recipes. >> DEPENDS += '${@bb.utils.contains_any("ARCH", [ "x86", "arm64", "powerpc" ], "elfutils-native", "", d)}' >> DEPENDS += "openssl-native util-linux-native" >> DEPENDS += "gmp-native libmpc-native" >> +RUST_KERNEL_DEPENDS ?="${@bb.utils.contains('KERNEL_RUST_SUPPORT', 'True', 'clang-native >> rust-native bindgen-cli-native', '', d)}" >> +DEPENDS += "${RUST_KERNEL_DEPENDS}" >> >> # Some options depend on CONFIG_PAHOLE_VERSION, so need to make pahole-native available before do_kernel_configme >> do_kernel_configme[depends] += '${@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. > The implementation of KERNEL_RUST_SUPPORT is problematic 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 appropriate > 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 > > > > > --------------ksYwiQHhrYpVfVkl2HxQtofK Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit


On 3/9/2026 4:56 PM, Richard Purdie wrote:
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On Wed, 2026-03-04 at 09:43 -0800, Sadineni, Harish via lists.openembedded.org wrote:

From: Harish Sadineni <Harish.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@windriver.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 = " features/kernel-sample/kernel-sample.scc"

 KERNEL_DEBUG ?= ""
+KERNEL_RUST_SUPPORT ?= ""
 # These used to be version specific, but are now common dependencies.  New
 # tools / dependencies will continue to be added in version specific recipes.
 DEPENDS += '${@bb.utils.contains_any("ARCH", [ "x86", "arm64", "powerpc" ], "elfutils-native", "", d)}'
 DEPENDS += "openssl-native util-linux-native"
 DEPENDS += "gmp-native libmpc-native"
+RUST_KERNEL_DEPENDS ?= "${@bb.utils.contains('KERNEL_RUST_SUPPORT', 'True', 'clang-native rust-native bindgen-cli-native', '', d)}"
+DEPENDS += "${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] += '${@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. 
The implementation of KERNEL_RUST_SUPPORT is problematic 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 appropriate
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
--------------ksYwiQHhrYpVfVkl2HxQtofK--