`rustc_codegen_gcc` wanted features & bugfixes

[ojeda]

Features that we would like to see

Required (we almost certainly want them)

Nice to have (not critical, we could workaround if needed, etc.)

Low priority (we will likely not use them in the end)

Done (stabilized, fixed, not needed anymore, etc.)

• Support -Crelocation-model.

  • Issue: Support -Crelocation-model rust-lang/rustc_codegen_gcc#205.
  • PR: Sync from rust 2024/12/11 rust-lang/rustc_codegen_gcc#578.

• rustup distribution.

  • Issue: Distribute it with rustup rust-lang/rustc_codegen_gcc#465.
  • PR: Add GCC and the GCC codegen backend to build-manifest and rustup rust-lang/rust#151156 (1.95).

• Use rust target triple instead of LLVM's.

  • PR: Use rust target triple instead of LLVM's rust-lang/rustc_codegen_gcc#954 (1.99).

• Load libgccjit from the LLVM target path as a fallback.

  • This is intended to fix the Rust for Linux CI with rustc_codegen_gcc.
  • PR: Load libgccjit from the LLVM target path as a fallback rust-lang/rustc_codegen_gcc#956.

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Bugs that we would like to see fixed

Required (we almost certainly want them)

Nice to have (probably not critical, we could workaround if needed, etc.)

Low priority (we will likely not use them in the end)

Done (stabilized, fixed, or not needed anymore, etc.)