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* make ARCH=arm64 rustdoc fails on a x86 host with SCS enabled
@ 2025-07-22 10:52 Konrad Dybcio
  2025-07-22 12:40 ` Miguel Ojeda
  0 siblings, 1 reply; 4+ messages in thread
From: Konrad Dybcio @ 2025-07-22 10:52 UTC (permalink / raw)
  To: Miguel Ojeda, Alex Gaynor, Boqun Feng, Gary Guo,
	Björn Roy Baron, Benno Lossin, Andreas Hindborg, Alice Ryhl,
	Trevor Gross, Danilo Krummrich, rust-for-linux, lkml

Trying to build rustdoc as part of an arm64 kernel build on an x86
host results in a number of errors. Looks like we're ignoring the
-Zfixed-18 flag (arch/arm64/Makefile) at some point in the build
process, but I wasn't able to track it down it myself. Found on
next-20250722 (today).

Disabling SCS works around the issue, but that's less than ideal.

$ rustc --version
rustc 1.88.0 (6b00bc388 2025-06-23)

Error log below (CONFIG_SHADOW_CALL_STACK=y):

$ make ARCH=arm64 LLVM=1 -j24 rustdoc

[...]

error: mixing `-Zfixed-x18` will cause an ABI mismatch in crate `ffi`
 --> rust/ffi.rs:3:1
  |
3 | //! Foreign function interface (FFI) types.
  | ^
  |
  = help: the `-Zfixed-x18` flag modifies the ABI so Rust crates compiled with different values of this flag cannot be used together safely
  = note: unset `-Zfixed-x18` in this crate is incompatible with `-Zfixed-x18=` in dependency `core`
  = help: set `-Zfixed-x18=` in this crate or unset `-Zfixed-x18` in `core`
  = help: if you are sure this will not cause problems, you may use `-Cunsafe-allow-abi-mismatch=fixed-x18` to silence this error

error: mixing `-Zfixed-x18` will cause an ABI mismatch in crate `ffi`
 --> rust/ffi.rs:3:1
  |
3 | //! Foreign function interface (FFI) types.
  | ^
  |
  = help: the `-Zfixed-x18` flag modifies the ABI so Rust crates compiled with different values of this flag cannot be used together safely
  = note: unset `-Zfixed-x18` in this crate is incompatible with `-Zfixed-x18=` in dependency `compiler_builtins`
  = help: set `-Zfixed-x18=` in this crate or unset `-Zfixed-x18` in `compiler_builtins`
  = help: if you are sure this will not cause problems, you may use `-Cunsafe-allow-abi-mismatch=fixed-x18` to silence this error

error: aborting due to 2 previous errors
error: mixing `-Zfixed-x18` will cause an ABI mismatch in crate `compiler_builtins`
 --> rust/compiler_builtins.rs:3:1
  |
3 | //! Our own `compiler_builtins`.
  | ^

  |
  = help: the `-Zfixed-x18` flag modifies the ABI so Rust crates compiled with different values of this flag cannot be used together safely
  = note: unset `-Zfixed-x18` in this crate is incompatible with `-Zfixed-x18=` in dependency `core`
  = help: set `-Zfixed-x18=` in this crate or unset `-Zfixed-x18` in `core`
  = help: if you are sure this will not cause problems, you may use `-Cunsafe-allow-abi-mismatch=fixed-x18` to silence this error

error: aborting due to 1 previous error

Konrad

^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2025-07-28  9:01 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2025-07-22 10:52 make ARCH=arm64 rustdoc fails on a x86 host with SCS enabled Konrad Dybcio
2025-07-22 12:40 ` Miguel Ojeda
2025-07-27  9:25   ` Miguel Ojeda
2025-07-28  9:01     ` Konrad Dybcio

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