On 2025-12-22 4:38 a.m., Yash.Shinde@windriver.com wrote:

From: Hemanth Kumar M D <hemanth.250302@gmail.com>

Rust 1.92.0 adds new test that require unwind table support to be
enabled by default. Set `default-uwtable = true` in the generated
target spec to match upstream behavior.

ref:https://github.com/rust-lang/rust/commit/fe66eaa67acc47525db6f13cf97d54780d87b805

Also ignore the no_std simple-runs UI test on ARM targets. The test
fails with panic=abort due to a known unwind table issue on 32-bit ARM

https://github.com/rust-lang/rust/issues/146996

Okay and I'm glad to see the upstream issues linked.

Should we make some of these tspec decisions set-able by well-informed users?

Maybe they can already do that using this horridly named "FEATURES" variable.
(rename to RUST_FEATURES maybe ?)

Most of the tspec features are set explicitly here.
We are analyzing on the possibility to check and set them using FEATURES to make 
user-configurable.

Regards,
Yash

For example, this bug:

   Unable to produce a Rust static binary with TCLIBC=musl (oe-core/master)
   https://bugzilla.yoctoproject.org/show_bug.cgi?id=16076

seems to be due to hard-coding dynamic-linking to True below just after your:
 

+    tspec['default-uwtable'] = True

change.

I've CCed Nick in case you guys have a quick work-around to enable static linking.

../Randy

Signed-off-by: Hemanth Kumar M D <hemanth.250302@gmail.com>
Signed-off-by: Yash Shinde <Yash.Shinde@windriver.com>
---
 meta/classes-recipe/rust-target-config.bbclass       |  1 +
 .../rust/files/rust-oe-selftest.patch                | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/meta/classes-recipe/rust-target-config.bbclass b/meta/classes-recipe/rust-target-config.bbclass
index 33a290412e..2a06c4ae8b 100644
--- a/meta/classes-recipe/rust-target-config.bbclass
+++ b/meta/classes-recipe/rust-target-config.bbclass
@@ -418,6 +418,7 @@ def rust_gen_target(d, thing, wd, arch):
         tspec['llvm-floatabi'] = "soft"
     elif fpu == "hard":
         tspec['llvm-floatabi'] = "hard"
+    tspec['default-uwtable'] = True
     tspec['dynamic-linking'] = True
     tspec['executables'] = True
     tspec['linker-is-gnu'] = True
diff --git a/meta/recipes-devtools/rust/files/rust-oe-selftest.patch b/meta/recipes-devtools/rust/files/rust-oe-selftest.patch
index b39b326455..d1fba81612 100644
--- a/meta/recipes-devtools/rust/files/rust-oe-selftest.patch
+++ b/meta/recipes-devtools/rust/files/rust-oe-selftest.patch
@@ -254,3 +254,15 @@ index a3562f2fd93..d4e52ed91be 100644
      fn linux_hwcap2_aarch64() {
          let file =
              concat!(env!("CARGO_MANIFEST_DIR"), "/src/detect/test_data/linux-hwcap2-aarch64.auxv");
+diff --git a/tests/ui/no_std/simple-runs.rs b/tests/ui/no_std/simple-runs.rs
+index af44dfe..e6674e5 100644
+--- a/tests/ui/no_std/simple-runs.rs
++++ b/tests/ui/no_std/simple-runs.rs
+@@ -2,6 +2,7 @@
+ 
+ //@ run-pass
+ //@ compile-flags: -Cpanic=abort
++//@ ignore-arm FIXME(#146996)
+ //@ ignore-wasm different `main` convention
+ 
+ #![feature(lang_items)]

-- 
# Randy MacLeod
# Wind River Linux

-- 
Regards,
Yash Shinde