On 2025-11-19 11:47 a.m., [email protected] wrote:
From: Harish Sadineni<[email protected]>
v3:
- Addressed v2 review feedback regarding adding dependencies to a variable and
assigning them using (?=).
- Moved staging of Rust libraries for the Linux-Yocto 'make rustavailable' step
from linux-yocto.inc
to kernel-yocto.bbclass.
- Made copying of the Rust library directory into tmp/work-shared optional and
performed only when
building rust-native when rust-kernel is present in DISTRO_FEATURES.
- Split rust.cfg into three separate config fragments: rust.cfg,
rust-samples.cfg, and rust-debug.cfg.
- Disabled ccache for Linux-Yocto builds when rust-kernel is present in
DISTRO_FEATURES
- Added an oe-selftest case for the Linux Rust sample
Summary of changes:
- Patch 1: Extend 'bindgen-cli' to support 'nativesdk', allowing it to be
available in the SDK environment.
- Patch 2: Add required dependencies ('clang-native', 'rust-native',
'bindgen-cli-native') to the kernel to support Rust binding generation.
- Patch 3: Install the Rust standard library source ('library/') into
`work-shared` and which will be later copied to
linux-yocto recipe-sysroot-native.
- Patch 4: Added 'rust-kernel' to DISTRO_FEATURES_FILTER_NATIVE and
DISTRO_FEATURES_FILTER_NATIVESDK, the 'rust-kernel' feature automatically
propagates from target DISTRO_FEATURES to native/nativesdk builds
- Patch 5: Stage the Rust sources into `recipe-sysroot-native` for kernel build
compatibility, making them visible during native builds.
- Patch 6: Update `kernel-yocto.bbclass` to invoke `make rustavailable` during
'do_kernel_configme', ensuring Rust readiness.
- Patch 7: Add kernel configuration support for Rust (via 'rust.cfg' and
'rust.scc'), enabling the Rust build options in kernel config.
- Patch 8: Fixed buildpaths errors when rust is enabled for kernel by appending
--remap-path-prefix to RUST_DEBUG_REMAP
- Patch 9: Disabling ccache when rust-kernel is enabled for linux-yocto.
- Patch 10: Copy Rust kernel sources into kernel-devsrc build directory which
will be required while running 'make prepare' in sdk.
- Patch 11: Added an oe-selftest case for the Linux Rust sample.
Benchmark test-result for x86-64:
For bitbake core-image-minimal
+-------------------------------+------------+-----------+-----------+-----------+
| DISTRO_FEATURES | real | user | sys | FS
usage |
+-------------------------------+------------+-----------+-----------+-----------+
| rust-kernel (enabled) | 46m1.720s | 0m28.864s | 0m3.696s | 58 GB
|
| rust-kernel (disabled) | 30m1.053s | 0m20.091s | 0m2.748s | 33 GB
|
+-------------------------------+------------+-----------+-----------+-----------+
Thanks for reporting on the time and space bloat.
The increased in time & fs usage is due to kernel rust dependencies in
linux-yocto. These will get solved by using pre-built binaries from
meta-rust-bin (WIP).
We haven't decided if let alone how we're going to ensure that a
quick kernel build with rust enabled is still fairly quick.
We can look into meta-rust-bin as I suggested but we should be
evaluating it and sharing the pros and cons rather than thinking that
this approach will solve the "rust takes forever to build" problem.
WIP:
- I am working on try to use make use of prebuilt binaries for rust and cargo
using meta-rust-bin layer which is having compatability issues
with oe-core master branch.
- rust-out-of-tree kernel module recipe and selftest is in progress (by Yoann
Congal)
Test results:
- tested with oe-selftest case for the Linux Rust sample for x86_64 and arm64.
- tested with rust-out-of-tree kernel module in sdk for x86_64 and arm64.
Very nice work Harish.
One more thing that isn't a requirement for being able to support
linux-yocto with rust enabled but
at some point, we want to test that self-hosted rust-enabled kernel
development works.
As a non-urgent, unless Bruce demands it, task could you try installing:
packagegroup-core-buildessential.bb
packagegroup-rust-sdk-target.bb
and then on target, clone a kernel tree and try manually compiling
a rust-enabled kernel (module)?
Thanks,
../Randy
If everthing is fine, Can we send this as patch?.
Harish Sadineni (9):
bindgen-cli: extend BBCLASSEXTEND to include nativesdk
linux-yocto: add clang-native,rust-native and bindgen-cli-native to
DEPENDS
rust: install Rust library sources for 'make rustavailable' support
bitbake.conf: Include "rust-kernel" in native/nativesdk feature
filters
kernel-yocto: stage rustlib sources for linux-yocto 'make
rustavailable' support
kernel-yocto: add rust support via "make rustavailable" in
do_kernel_configme
linux-yocto: enable Rust support in kernel configuration
kernel-yocto: Fix for buildpaths errors when rust is enabled for
kernel
kernel-devsrc: copying rust-kernel soucre to $kerneldir/build
Yoann Congal (2):
kernel-yocto.bbclass: Disable ccache when rust-kernel is enabled
selftest/cases/runtime_test: Add test for Linux Rust sample
meta/classes-recipe/kernel-yocto.bbclass | 28 +++++++++++++++++++
meta/conf/bitbake.conf | 4 +--
meta/lib/oeqa/selftest/cases/runtime_test.py | 24 ++++++++++++++++
.../bindgen-cli/bindgen-cli_0.72.1.bb | 2 +-
meta/recipes-devtools/rust/rust_1.90.0.bb | 17 +++++++++++
.../recipes-kernel/linux/files/rust-debug.cfg | 1 +
.../recipes-kernel/linux/files/rust-debug.scc | 3 ++
.../linux/files/rust-samples.cfg | 4 +++
.../linux/files/rust-samples.scc | 3 ++
meta/recipes-kernel/linux/files/rust.cfg | 3 ++
meta/recipes-kernel/linux/files/rust.scc | 3 ++
meta/recipes-kernel/linux/kernel-devsrc.bb | 4 +++
meta/recipes-kernel/linux/linux-yocto.inc | 2 ++
meta/recipes-kernel/linux/linux-yocto_6.16.bb | 2 ++
meta/recipes-kernel/linux/linux-yocto_6.17.bb | 2 ++
15 files changed, 99 insertions(+), 3 deletions(-)
create mode 100644 meta/recipes-kernel/linux/files/rust-debug.cfg
create mode 100644 meta/recipes-kernel/linux/files/rust-debug.scc
create mode 100644 meta/recipes-kernel/linux/files/rust-samples.cfg
create mode 100644 meta/recipes-kernel/linux/files/rust-samples.scc
create mode 100644 meta/recipes-kernel/linux/files/rust.cfg
create mode 100644 meta/recipes-kernel/linux/files/rust.scc
--
# Randy MacLeod
# Wind River Linux
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