Re: [OE-core] [PATCH] rust: Enable dynamic linking with llvm

["Mathieu Dubois-Briand" <mathieu.dubois-briand@bootlin.com>]

On Thu Feb 12, 2026 at 5:50 PM CET, Sunil Kumar via lists.openembedded.org Dora wrote:
> From: Sunil Dora <sunilkumar.dora@windriver.com>
>
> YOCTO #16058
>
> When llvm-native is built with a newer toolchain (e.g. GCC 15) and
> reused on a system with an older linker, rustc emit segfault at runtime.
>
> This issue occurs because rustc, which is statically linked with LLVM libraries,
> was built on one machine using a newer toolchain and then executed on another machine
> that has an older linker. To prevent crash, LLVM now linked with rustc dynamically.
>
> Added llvm as dependency to provide libllvm.so at runtime.
>
> Signed-off-by: Sunil Dora <sunilkumar.dora@windriver.com>
> Signed-off-by: Alexander Kanavin <alex@linutronix.de>
> Signed-off-by: Deepesh Varatharajan <Deepesh.Varatharajan@windriver.com>
> ---

Hi Sunil,

It looks like this is breaking some builds:

ERROR: rust-1.93.0-r0 do_install: Execution of '/srv/pokybuild/yocto-worker/qemux86-world-alt/build/build/tmp/work/x86-64-v3-poky-linux/rust/1.93.0/temp/run.do_install.3402703' failed with exit code 1
...
| error: failed to run custom build command for `rustc_llvm v0.0.0 (/srv/pokybuild/yocto-worker/qemux86-world-alt/build/build/tmp/work/x86-64-v3-poky-linux/rust/1.93.0/sources/rustc-1.93.0-src/compiler/rustc_llvm)`
|
| Caused by:
|   process didn't exit successfully: `/srv/pokybuild/yocto-worker/qemux86-world-alt/build/build/tmp/work/x86-64-v3-poky-linux/rust/1.93.0/sources/rustc-1.93.0-src/build/x86_64-unknown-linux-gnu/stage2-rustc/release/build/rustc_llvm-de72af8bf33c0296/build-script-build` (exit status: 101)
...
|   --- stderr
|   llvm-config: error: libLLVM-21.so is missing

https://autobuilder.yoctoproject.org/valkyrie/#/builders/17/builds/3020

Can you have a look at this issue?

Thanks,
Mathieu

-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com