On Mon Mar 30, 2026 at 12:37 AM CEST, Yoann Congal wrote:
> From: Sunil Dora <[email protected]>
>
> Fixes [Yocto #16058]
>
> A segmentation fault occurs in rustc (e.g. in
> llvm::X86ReadAdvanceTable) when reusing sstate artifacts built with
> different host toolchain versions.
>
> Issue sequence:
> 1. llvm-native is built with a newer toolchain
> (e.g. GCC 15/Binutils 2.45).
> 2. rust-native is later built with an older linker.
> (e.g. GCC 12/Binutils 2.40).
> 3. The older linker statically links parts of llvm-native into
> librustc_driver.
> 4. The resulting binary crashes at runtime inside the statically
> linked LLVM code.
>
> The corruption happens at link time when mixing static native objects
> produced by different toolchain generations.
>
> Enable dynamic LLVM linking (link-shared = true) for rust-native so rustc
> links against libLLVM.so instead of static archives, avoiding host linker
> incompatibilities when reusing sstate artifacts.
>
> Signed-off-by: Sunil Dora <[email protected]>
> Suggested-by: Alexander Kanavin <[email protected]>
> Signed-off-by: Richard Purdie <[email protected]>
> (cherry picked from commit 74ba238ff1ba1e9b612aece1989b828f3a8f8770)
> Signed-off-by: Yoann Congal <[email protected]>
> ---
I did not wanted to send that patch, please ignore.
> meta/recipes-devtools/rust/rust_1.75.0.bb | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/meta/recipes-devtools/rust/rust_1.75.0.bb
> b/meta/recipes-devtools/rust/rust_1.75.0.bb
> index b9348bf0507..f037bb33715 100644
> --- a/meta/recipes-devtools/rust/rust_1.75.0.bb
> +++ b/meta/recipes-devtools/rust/rust_1.75.0.bb
> @@ -128,6 +128,8 @@ python do_configure() {
>
> # [llvm]
> config.add_section("llvm")
> + if d.getVar('PN') == "rust-native":
> + config.set("llvm", "link-shared", e(True))
> config.set("llvm", "static-libstdcpp", e(False))
> if "llvm" in (d.getVar('TC_CXX_RUNTIME') or ""):
> config.set("llvm", "use-libcxx", e(True))
--
Yoann Congal
Smile ECS
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