On 04-09-2026 03:04 am, Yoann Congal wrote:
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On Tue Aug 11, 2026 at 1:58 PM CEST, Harish via lists.openembedded.org Sadineni
wrote:
From: Harish Sadineni <[email protected]>
Kernel Rust support on riscv64 requires building the kernel with Clang.
Since Wrynose does not provide Clang toolchian support for kernel
builds, skip the recipe when TARGET_ARCH is riscv64.
Hello,
OE-Core/wrynose indeed does not but meta-clang seem to do that:
https://github.com/kraj/meta-clang/blob/wrynose/conf/nonclangable.conf#L369
Wouldn't this patch needlessly prevent user from using meta-clang to get
a RISCV rust-enabled kernel?
I wonder if we need a patch more like master's:
2b228490b7e (kernel-yocto-rust: Add clang toolchain check for riscv64,
2026-08-05)
What do you think?
Hi Yoann,
I understood what you meant, If someone uses 'linux-yocto_%.bbappend' to
build the kernel with the clang toolchain [1],
this patch would prevent them from using rust in the kernel. Is my
understanding correct?
If so, I'll implement the same clang toolchain check as
'kernel-yocto-rust: Add clang toolchain check for riscv64' for wrynose,
and just adjust the error message accordingly.
[1]https://github.com/kraj/meta-clang/blob/wrynose/README.md#kernel-build-with-clang
<https://github.com/kraj/meta-clang/blob/wrynose/README.md#kernel-build-with-clang>Thanks,
harish
This avoids attempting an unsupported kernel Rust build and provides a
clear parse-time error explaining the limitation.
Signed-off-by: Harish Sadineni <[email protected]>
---
meta/classes-recipe/kernel-yocto-rust.bbclass | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/meta/classes-recipe/kernel-yocto-rust.bbclass
b/meta/classes-recipe/kernel-yocto-rust.bbclass
index 49f2bfc1ae..6be97c2db8 100644
--- a/meta/classes-recipe/kernel-yocto-rust.bbclass
+++ b/meta/classes-recipe/kernel-yocto-rust.bbclass
@@ -25,3 +25,12 @@ do_kernel_configme:append () {
# More details in:
https://lists.openembedded.org/g/openembedded-core/message/229336
# Disable ccache for kernel build if kernel rust support is enabled to
workaround this.
CCACHE_DISABLE ?= "1"
+
+python () {
+ if d.getVar('TARGET_ARCH') == 'riscv64' :
+ raise bb.parse.SkipRecipe(
+ "Rust support in the kernel on riscv64 requires kernel to build with
clang, "
+ "Wrynose doesn't have clang toolchain support for kernel. See "
+ "https://docs.kernel.org/rust/arch-support.html for details."
+ )
+}
Regards,
--
Yoann Congal
Smile ECS
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