On Fri Sep 4, 2026 at 1:40 PM CEST, Harish Sadineni wrote: > > On 04-09-2026 03:04 am, Yoann Congal wrote: >> CAUTION: This email comes from a non Wind River email account! >> Do not click links or open attachments unless you recognize the sender and >> know the content is safe. >> >> 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?
Yes, we don't know how downstream users derive our recipe, we have to try to not break their use-case. In this case, it is even documented! Thanks for the link! > 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. Yes, I think e should do that. Thanks! > > [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 -- Yoann Congal Smile ECS
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