On Wed, 2026-03-04 at 09:43 -0800, Sadineni, Harish via lists.openembedded.org
wrote:
> From: Harish Sadineni <[email protected]>
>
> 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 <[email protected]>
> ---
> 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 get the feeling we're still not quite agreeing on how to make the
enabling of the feature work. I'm suggesting we do something like this:
diff --git a/meta/classes-recipe/kernel-yocto.bbclass
b/meta/classes-recipe/kernel-yocto.bbclass
index e53bf151941..9cc7568ab09 100644
--- a/meta/classes-recipe/kernel-yocto.bbclass
+++ b/meta/classes-recipe/kernel-yocto.bbclass
@@ -269,6 +269,9 @@ do_kernel_metadata() {
KERNEL_FEATURES_FINAL=""
if [ -n "${KERNEL_FEATURES}" ]; then
for feature in ${KERNEL_FEATURES}; do
+ if [ "$feature" = "rust" ]; then
+ feature="features/kernel-rust/kernel-rust.scc"
+ fi
feature_as_specified="$feature"
feature="$(echo $feature_as_specified | cut -d: -f1)"
feature_specifier="$(echo $feature_as_specified | cut
-d: -f2)"
which means you can then simply add to your config:
KERNEL_FEATURES += "rust"
and things should be enabled. This patch would then become:
RUST_KERNEL_DEPENDS ?= "${@bb.utils.contains('KERNEL_FEATURES', 'rust',
'clang-native rust-native bindgen-cli-native', '', d)}"
Is there some reason we can't do something like this?
Cheers,
Richard
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