interrupt service routine should have a pointer as the first argument

[matthiaskrgr]

snippet:

//@compile-flags: -Zcodegen-backend=gcc -Clink-dead-code=true --crate-type=lib
#![feature(abi_x86_interrupt)]
pub extern "x86-interrupt" fn f(a: i64) {}

Version information

rustc 1.95.0-nightly (a18e6d9d1 2026-01-24)
binary: rustc
commit-hash: a18e6d9d1473d9b25581dd04bef6c7577999631c
commit-date: 2026-01-24
host: x86_64-unknown-linux-gnu
release: 1.95.0-nightly
LLVM version: 21.1.8

Command:
/home/matthias/.rustup/toolchains/master/bin/rustc -Zcodegen-backend=gcc -Clink-dead-code=true --crate-type=lib

Program output

warning: unused variable: `a`
 --> /tmp/icemaker_global_tempdir.ixZrmjiu4rgx/rustc_testrunner_tmpdir_reporting.fd7j7VvF0nFL/mvce.rs:2:33
  |
2 | pub extern "x86-interrupt" fn f(a: i64) {}
  |                                 ^ help: if this is intentional, prefix it with an underscore: `_a`
  |
  = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default

libgccjit.so: error: : interrupt service routine should have a pointer as the first argument
error: failed to build archive at `outputfile`: failed to open object file: No such file or directory (os error 2)

error: aborting due to 1 previous error; 1 warning emitted