Tracking Issue for sparc_target_feature

This is a tracking issue for SPARC architecture specific part of https://github.com/rust-lang/rust/issues/44839 (RFC 2045 (rust-lang/rfcs#2045)).
The feature gate for the issue is #![feature(sparc_target_feature)].

About tracking issues

Tracking issues are used to record the overall progress of implementation.
They are also used as hubs connecting to other relevant issues, e.g., bugs or open design questions.
A tracking issue is however not meant for large scale discussion, questions, or bug reports about a feature.
Instead, open a dedicated issue for the specific matter and add the relevant feature gate label.
Discussion comments will get marked as off-topic or deleted.
Repeated discussions on the tracking issue may lead to the tracking issue getting locked.

Steps

• Implementation https://github.com/rust-lang/rust/pull/132552
• Stabilization PR (see instructions on rustc-dev-guide)

Unresolved Questions

• Behavior of v8plus target feature is LLVM version dependent until LLVM 20 becomes minimal LLVM version (https://github.com/rust-lang/rust/issues/132585#issuecomment-2453926257)
• Enabling v8plus target feature without v9 target feature should be rejected. (AFAIK, there is no existing mechanism to represent this.)
  https://github.com/rust-lang/rust/blob/c059eb77504b638bc53b486ef7151cedb7a7ef03/tests/ui/abi/sparcv8plus.rs#L37-L39
  Or, enable v9 target feature automatically when v8plus target feature enabled.

Implementation history

• v9, v8plus, leoncasa: https://github.com/rust-lang/rust/pull/132552

@rustbot label +O-SPARC +A-target-feature

Start with the stabilization guide and the implementation PR #132552, then inspect tests/ui/abi/sparcv8plus.rs around the referenced lines. Stabilization is complete when the stabilization PR addresses the remaining v8plus/v9 behavior question and the feature is ready to leave its gate.