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[RFC,1/3] rust: Enable dynamic linking with llvm

Message ID 20260626-ycongal-scarthgap-rust-segfault-v1-1-97df64b7b298@smile.fr
State Accepted, archived
Commit 74ba238ff1ba1e9b612aece1989b828f3a8f8770
Delegated to: Yoann Congal
Headers show
Series RFC: Fixing rust segfault (#16058) to support Ubuntu 26.04 on Scarthgap | expand

Commit Message

Yoann Congal June 26, 2026, 11:37 a.m. UTC 
From: Sunil Dora <sunilkumar.dora@windriver.com>

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 <sunilkumar.dora@windriver.com>
Suggested-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 74ba238ff1ba1e9b612aece1989b828f3a8f8770)
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
---
 meta/recipes-devtools/rust/rust_1.75.0.bb | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/meta/recipes-devtools/rust/rust_1.75.0.bb b/meta/recipes-devtools/rust/rust_1.75.0.bb
index b9348bf05071016cf27880258e27babb3f2eec90..f037bb33715dc4ba7cbb489ab1599ac6c8c875a4 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))