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[meta-lts-mixins,scarthgap/rust,07/11] rust-target-config: PPC64 targets require explicit ABI selection to avoid build failures with rustc.

Message ID 77052fec220c0cc0ad4e40abbf62bccd8573a1f2.1762633051.git.scott.murray@konsulko.com
State New
Headers show
Series Update to Rust 1.90.0 | expand

Commit Message

Scott Murray Nov. 8, 2025, 8:19 p.m. UTC 
From: Deepesh Varatharajan <Deepesh.Varatharajan@windriver.com>

Without a specified ABI, rustc panics with the following error:
|   thread 'rustc' panicked at compiler/rustc_codegen_ssa/src/back/metadata.rs:394:21:
|   No ABI specified for this PPC64 ELF target.

This issue was occuring because of the following Rust commit:
https://github.com/rust-lang/rust/commit/9c1180b6238d163fc384d60d85647385d9210343

As noted in the upstream changes:
If the flags do not correctly indicate the ABI,
linkers such as ld.lld assume that the ppc64 object files are always ELFv2,
which leads to broken binaries if ELFv1 is used for the object files.

Because of this, it is now required to explicitly specify the ABI for PPC64 targets
using one of the following:
"elfv1" => EF_PPC64_ABI_ELF_V1,
"elfv2" => EF_PPC64_ABI_ELF_V2,

If no ABI is specified, the Rust compiler will panic with the error:
No ABI specified for this PPC64 ELF target

To address this:
- Set 'elfv2' for powerpc64le (little-endian), which mandates ELFv2 ABI.
- Set 'elfv1' for powerpc64 (big-endian), which defaults to ELFv1 ABI.

Signed-off-by: Deepesh Varatharajan <Deepesh.Varatharajan@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(adapted from oe-core commit 6cee30b7941c22eef52011b6bac0d3c0d7944abe)
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
---
 classes-recipe/rust-target-config.bbclass | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/classes-recipe/rust-target-config.bbclass b/classes-recipe/rust-target-config.bbclass
index 0377fcd..b9198c7 100644
--- a/classes-recipe/rust-target-config.bbclass
+++ b/classes-recipe/rust-target-config.bbclass
@@ -386,6 +386,10 @@  def rust_gen_target(d, thing, wd, arch):
         tspec['llvm-abiname'] = "ilp32d"
     if "loongarch64" in tspec['llvm-target']:
         tspec['llvm-abiname'] = "lp64d"
+    if "powerpc64le" in tspec['llvm-target']:
+        tspec['llvm-abiname'] = "elfv2"
+    if "powerpc64" in tspec['llvm-target']:
+        tspec['llvm-abiname'] = "elfv1"
     tspec['vendor'] = "unknown"
     tspec['target-family'] = "unix"
     tspec['linker'] = "{}{}gcc".format(d.getVar('CCACHE'), prefix)