On 1/7/2026 12:29 AM, Randy MacLeod wrote:
On 2026-01-05 11:24 a.m., Harish Sadineni wrote:
On 12/30/2025 9:28 PM, Richard Purdie wrote:
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On Tue, 2025-12-30 at 06:15 -0800, Sadineni, Harish via
lists.openembedded.org wrote:
From: Harish Sadineni <[email protected]>
The `make rustavailable` process (1) expects the Rust standard
library source files (e.g., `lib.rs`)
to be present in the `library/` directory under `rustlib/src/rust/`.
This patch ensures the required sources are available by:
- Copying the `library/` directory from the Rust source tree into
`${TMPDIR}/work-shared/rust`
during the snapshot setup.
- Installing the `library/` directory into
`${SDKPATHNATIVE}/usr/lib/rustlib/src/rust` for the
`nativesdk` class, making them available in them available in sdk
1) See the kernel tree for Documentation/rust/quick-start.rst in
the section: Requirements: Building
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/rust/quick-start.rst#n145
Signed-off-by: Harish Sadineni <[email protected]>
---
meta/recipes-devtools/rust/rust_1.91.1.bb | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/meta/recipes-devtools/rust/rust_1.91.1.bb
b/meta/recipes-devtools/rust/rust_1.91.1.bb
index a25f65f674..7644ecf2d2 100644
--- a/meta/recipes-devtools/rust/rust_1.91.1.bb
+++ b/meta/recipes-devtools/rust/rust_1.91.1.bb
@@ -63,6 +63,16 @@ do_rust_setup_snapshot () {
done
fi
}
+
+do_rust_setup_snapshot:append:class-native () {
+ if ${@bb.utils.contains('DISTRO_FEATURES', 'rust-kernel',
'true', 'false', d)}; then
+ if [ ! -d "${TMPDIR}/work-shared/rust" ]; then
+ mkdir -p ${TMPDIR}/work-shared/rust
+ cp -r ${RUSTSRC}/library ${TMPDIR}/work-shared/rust/.
+ fi
+ fi
+}
+
addtask rust_setup_snapshot after do_unpack before do_configure
addtask do_test_compile after do_configure do_rust_gen_targets
do_rust_setup_snapshot[dirs] += "${WORKDIR}/rust-snapshot"
@@ -314,6 +324,13 @@ rust_do_install:class-nativesdk() {
export
CARGO_TARGET_${RUST_HOST_TRIPLE}_RUNNER="\$OECORE_NATIVE_SYSROOT/lib/${SDKLOADER}"
export CC_$RUST_HOST_CC="${CCACHE}${HOST_PREFIX}gcc"
EOF
+
+ if ${@bb.utils.contains('DISTRO_FEATURES', 'rust-kernel',
'true', 'false', d)}; then
+ if [ ! -d ${D}${SDKPATHNATIVE}/usr/lib/rustlib/src/rust
]; then
+ mkdir -p
${D}${SDKPATHNATIVE}/usr/lib/rustlib/src/rust
+ cp -r --no-preserve=ownership ${S}/library
${D}${SDKPATHNATIVE}/usr/lib/rustlib/src/rust/
+ fi
+ fi
}
FILES:${PN} += "${base_prefix}/environment-setup.d"
The commit message should mention the size of these files.
Ok sure, I will add file size in v3.
Does this make sense as a distro feature or should we just do this
all the time?
This is suggestion from Bruce that we take it as distro feature.
https://lists.openembedded.org/g/openembedded-core/message/225256
Richard mentioned this thread in today's tech call when I asked for
commentson the rust-kernel PR.
Yes, the high level requirement is to have a DISTRO_FEATURE but
common, infrastructure parts
such as this code that just copies a hopefully small number of files
around,
and is part of the rust recipe, could and likely be done regardless of
the rust-kernel DISTRO_FEATURE.
Ok sure, We will remove the dependency on DISTRO_FEATURE for copying
the library directory from rust recipe.
We don't want the rust recipe to change based on a kernel config
unless we *really* have to
since that essentially doubles the testing that should be done or
leaves a gap in testing of the
rust builds. If you do that for the kernel first, then another recipe
later, soon you have a maintenance mess.
Also if the kernel needs these files, then it's likely that other
software will need it as well.
You should analyze why the kernel needs these files and why other
recipes do not. Perhaps any
kernel-like image will have the same requirement. Is there a baremetal
image using rust anywhere
that you can use to check on that? I looked but all I found was:
https://github.com/ahcbb6/baremetal-helloqemu-rust
Anyway, let's focus on the linux kernel's requirements for now.
So, how many files are needed and how much FS space do they use?
The file size of the library directory is around 50MB.
What are other build systems (gentoo for example) doing with their
Rust builds to satisfy the kernel's rust requirements?
I will check and update on this.
In future when rust is default in kernel we can change this, But till
then it is good to have it as a distro feature.
Do the nativesdk components get packaged separately? If they were, we
could then make that an SDK feature instead.
No, We are not packaging it separately.
The questions seems to be whether we should create a separate
packaging rule.
Now by default it is getting packaged with nativesdk-rust, Do we need a
separate packaging for libraries/files that being installed for rust in
kernel support?
What happens for on target kernel module development? Shouldn't
there be a target package too?
Yes, I have made the necessary changes to include Rust library for
target as well and have tested Rust-based kernel module development
on the target.
I will send updated patches with v3.
Before you spend time on polishing v3 please explain what your
workflow is, step by step,
so we can be sure that things makes sense from a high level.
We will update the rust recipe to copy the required libs to target image
and then the below steps to be followed :
- Build the image by adding the required tools via IMAGE_INSTALL:append
( e.g kernel-devsrc, gcc, rust, cargo, bindgen-cli etc..).
- In /usr/src/kernel, run "make rustavailable" to verify Rust support
(This step will check all supporting tools are available for rust
support in kernel).
- Run "make menuconfig" and enable "CONFIG_RUST".
- Run "make scripts" and "make prepare".
- Write a kernel module in Rust & build the module using "make", which
generates the "module_name.ko" file.
- Load the module using "insmod module_name.ko".
Thanks,
Harish
../Randy
Thanks,
Harish
Cheers,
Richard
--
# Randy MacLeod
# Wind River Linux
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