Tracking Issue for sparc_target_feature

[taiki-e]

This is a tracking issue for SPARC architecture specific part of #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 Add v9, v8plus, and leoncasa target feature to sparc and use v8plus in create_object_file #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 (Our 32-bit Sparc handling isn't quite correct yet #132585 (comment))
• Enabling v8plus target feature without v9 target feature should be rejected. (AFAIK, there is no existing mechanism to represent this.)
  

  rust/tests/ui/abi/sparcv8plus.rs

  Lines 37 to 39 in c059eb7

  	// FIXME: should be rejected
  	#[cfg(all(target_feature = "v8plus", not(target_feature = "v9")))]
  	compile_error!("+v8plus,-v9 (FIXME)");

  
  Or, enable v9 target feature automatically when v8plus target feature enabled.

Implementation history

• v9, v8plus, leoncasa: Add v9, v8plus, and leoncasa target feature to sparc and use v8plus in create_object_file #132552

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