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Draft: rust: kbuild: treat build_error and rustdoc as kernel objects

Justin M. Forbesrequested to merge
jmflinuxtx/kernel-ark:rust-1.91 into os-build

Even if normally build_error isn't a kernel object, it should still be treated as such so that we pass the same flags. Similarly, rustdoc targets are never kernel objects, but we need to treat them as such.

Otherwise, starting with Rust 1.91.0 (released 2025-10-30), rustc will complain about missing sanitizer flags since -Zsanitizer is a target modifier too [1]:

error: mixing `-Zsanitizer` will cause an ABI mismatch in crate `build_error`
 --> rust/build_error.rs:3:1
  |
3 | //! Build-time error.
  | ^
  |
  = help: the `-Zsanitizer` flag modifies the ABI so Rust crates compiled with different values of this flag cannot be used together safely
  = note: unset `-Zsanitizer` in this crate is incompatible with `-Zsanitizer=kernel-address` in dependency `core`
  = help: set `-Zsanitizer=kernel-address` in this crate or unset `-Zsanitizer` in `core`
  = help: if you are sure this will not cause problems, you may use `-Cunsafe-allow-abi-mismatch=sanitizer` to silence this error

Thus explicitly mark them as kernel objects.

Cc: stable@vger.kernel.org # Needed in 6.12.y and later (Rust is pinned in older LTSs). Link: https://github.com/rust-lang/rust/pull/138736 [1] Signed-off-by: Miguel Ojeda ojeda@kernel.org Reviewed-by: Alice Ryhl aliceryhl@google.com

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