[PATCH] rust: Enable dynamic linking with llvm

[sunilkumar.dora@windriver.com]

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>
---
 meta/lib/oeqa/selftest/cases/rust.py      | 2 +-
 meta/recipes-devtools/rust/rust_1.93.0.bb | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/meta/lib/oeqa/selftest/cases/rust.py b/meta/lib/oeqa/selftest/cases/rust.py
index 3ae1946e43..7614941661 100644
--- a/meta/lib/oeqa/selftest/cases/rust.py
+++ b/meta/lib/oeqa/selftest/cases/rust.py
@@ -47,7 +47,7 @@ class RustSelfTestSystemEmulated(OESelftestTestCase, OEPTestResultTestCase):
         bitbake("{} -c test_compile".format(recipe))
         builddir = get_bb_var("RUSTSRC", "rust")
         # build core-image-minimal with required packages
-        default_installed_packages = ["libgcc", "libstdc++", "libatomic", "libgomp", "libzstd", "openssl"]
+        default_installed_packages = ["libgcc", "libstdc++", "libatomic", "libgomp", "libzstd", "llvm", "openssl"]
         features = []
         features.append('IMAGE_FEATURES += "ssh-server-dropbear"')
         features.append('CORE_IMAGE_EXTRA_INSTALL += "{0}"'.format(" ".join(default_installed_packages)))
diff --git a/meta/recipes-devtools/rust/rust_1.93.0.bb b/meta/recipes-devtools/rust/rust_1.93.0.bb
index a25f65f674..cfee48ec78 100644
--- a/meta/recipes-devtools/rust/rust_1.93.0.bb
+++ b/meta/recipes-devtools/rust/rust_1.93.0.bb
@@ -124,6 +124,7 @@ python do_configure() {
 
     # [llvm]
     config.add_section("llvm")
+    config.set("llvm", "link-shared", e(True))
     config.set("llvm", "static-libstdcpp", e(False))
     config.set("llvm", "download-ci-llvm", e(False))
     if "llvm" in (d.getVar('TC_CXX_RUNTIME') or ""):
-- 
2.49.0