AIX build error: cfmakeraw: expected `()`, found `i32`

[ponchofiesta]

I'm trying to build another tool but stumbling upon build problem in rustix 1.0.8. Maybe this is related to libc?

# rustix 1.0.8 repo
bash-5.2$ cargo build --offline -F "std fs termios"
warning: unused manifest key: hints
   Compiling libc v0.2.175
   Compiling rustix v1.0.8 (/data/rust/rustix)
   Compiling bitflags v2.9.1
   Compiling errno v0.3.13
error[E0308]: mismatched types
   --> src/backend/libc/termios/syscalls.rs:496:14
    |
496 |     unsafe { c::cfmakeraw(as_mut_ptr(termios).cast()) }
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found `i32`
    |
help: consider using a semicolon here
    |
496 |     unsafe { c::cfmakeraw(as_mut_ptr(termios).cast()); }
    |                                                      +
help: try adding a return type
    |
495 | pub(crate) fn cfmakeraw(termios: &mut Termios) -> i32 {
    |                                                ++++++

For more information about this error, try `rustc --explain E0308`.
error: could not compile `rustix` (lib) due to 1 previous error

Environment

• AIX 7300-03-00-2446

• bash-5.2$ rustc -Vv
  rustc 1.86.0 (a5ebf0b19 2025-05-14) (IBM Open SDK for Rust on AIX 1.86.0.1 (5900-BND, 5765-J24))
  binary: rustc
  commit-hash: a5ebf0b19288d52afd53ab0e9c74134de50d7701
  commit-date: 2025-05-14
  host: powerpc64-ibm-aix
  release: 1.86.0
  edition: (Community Edition)
  LLVM version: 19.1.7