On 1/29/2026 10:09 PM, Sadineni, Harish via lists.openembedded.org wrote:
From: Yoann Congal <[email protected]>
Publish artifacts from kernel compilation to allow out-of-tree Rust
compilation:
* scripts/target.json: target definition: architecture, ABI, compiler
options, ...
* rust/: the crates compiled by the kernel available to
out-of-tree-modules
Hi Yoann,
I am dropping this patch “kernel.bbclass: Export artifacts needed for
out-of-tree Rust compilation” from my v6 patch series.
Without this patch, target.json and the rust/ directory were already
getting published for x86_64. On arm64, target.json will not be created,
yet the module is still generated and works fine.
When building rust-out-f-tree-module for arm64 with this patch applied,
it emits a warning that Out-of-tree rust modules build will fail due to
a missing target.json in kernel. However, in practice, the build
completes successfully.
I have tested without this patch on both arm64 and x86_64, both tests
were successful.
So, this patch does not appear to be necessary. Are you OK with dropping
this patch?
I have pushed the updated changes to the below oe-contrib branch:
https://git.openembedded.org/openembedded-core-contrib/log/?h=deepesh/rust-in-kernel-v6
Additionally, I have extended the ccache disabling to make-mod-scripts
(as part of "kernel: Disable ccache when kernel rust support is enabled"
patch) and updated "meta-skeleton: Add rust-out-of-tree-module recipe"
to align with the new changes.
Thanks,
Harish
Signed-off-by: Yoann Congal <[email protected]>
Signed-off-by: Harish Sadineni <[email protected]>
---
meta/classes-recipe/kernel.bbclass | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/meta/classes-recipe/kernel.bbclass
b/meta/classes-recipe/kernel.bbclass
index 30a10b0801..dfb8604a68 100644
--- a/meta/classes-recipe/kernel.bbclass
+++ b/meta/classes-recipe/kernel.bbclass
@@ -632,6 +632,24 @@ do_shared_workdir () {
cp -r scripts/gcc-plugins ${kerneldir}/scripts
fi
+ if ${@bb.utils.contains("DISTRO_FEATURES", "rust-kernel", "true", "false", d)}; then
+ # Copy target.json file needed for out-of-tree rust modules
+ if [ -e scripts/target.json ]; then
+ bbnote "Copying scripts/target.json"
+ mkdir -p ${kerneldir}/scripts
+ cp scripts/target.json ${kerneldir}/scripts
+ else
+ bbwarn "scripts/target.json not found in compiled kernel.
Out-of-tree rust modules will fail to build."
+ fi
+
+ # Copy rust/ needed by out-of-tree module (firstly for the core
rust crate)
+ if [ -e rust/ ]; then
+ bbnote "Copying rust/"
+ cp -r rust ${kerneldir}/
+ else
+ bbwarn "rust/ not found in compiled kernel. Out-of-tree rust
modules will fail to build."
+ fi
+ fi
}
# We don't need to stage anything, not the modules/firmware since those would clash with linux-firmware
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