mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-02 07:22:42 +00:00
2d476222e8
This is intended to be used for Linux kernel RETHUNK builds. With this commit (optionally backported to Rust 1.73.0), plus a patched Linux kernel to pass the flag, I get a RETHUNK build with Rust enabled that is `objtool`-warning-free and is able to boot in QEMU and load a sample Rust kernel module. Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
29 lines
1.0 KiB
Rust
29 lines
1.0 KiB
Rust
// Test that the `fn_ret_thunk_extern` function attribute is (not) emitted when
|
|
// the `-Zfunction-return={keep,thunk-extern}` flag is (not) set.
|
|
|
|
// revisions: unset keep thunk-extern keep-thunk-extern thunk-extern-keep
|
|
// needs-llvm-components: x86
|
|
// compile-flags: --target x86_64-unknown-linux-gnu
|
|
// [keep] compile-flags: -Zfunction-return=keep
|
|
// [thunk-extern] compile-flags: -Zfunction-return=thunk-extern
|
|
// [keep-thunk-extern] compile-flags: -Zfunction-return=keep -Zfunction-return=thunk-extern
|
|
// [thunk-extern-keep] compile-flags: -Zfunction-return=thunk-extern -Zfunction-return=keep
|
|
|
|
#![crate_type = "lib"]
|
|
#![feature(no_core, lang_items)]
|
|
#![no_core]
|
|
|
|
#[lang = "sized"]
|
|
trait Sized {}
|
|
|
|
#[no_mangle]
|
|
pub fn foo() {
|
|
// CHECK: @foo() unnamed_addr #0
|
|
|
|
// unset-NOT: fn_ret_thunk_extern
|
|
// keep-NOT: fn_ret_thunk_extern
|
|
// thunk-extern: attributes #0 = { {{.*}}fn_ret_thunk_extern{{.*}} }
|
|
// keep-thunk-extern: attributes #0 = { {{.*}}fn_ret_thunk_extern{{.*}} }
|
|
// thunk-extern-keep-NOT: fn_ret_thunk_extern
|
|
}
|