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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
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// the `-Zfunction-return={keep,thunk-extern}` flag is (not) set.
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// revisions: unset keep thunk-extern keep-thunk-extern thunk-extern-keep
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// needs-llvm-components: x86
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// compile-flags: --target x86_64-unknown-linux-gnu
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// [keep] compile-flags: -Zfunction-return=keep
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// [thunk-extern] compile-flags: -Zfunction-return=thunk-extern
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// [keep-thunk-extern] compile-flags: -Zfunction-return=keep -Zfunction-return=thunk-extern
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// [thunk-extern-keep] compile-flags: -Zfunction-return=thunk-extern -Zfunction-return=keep
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#![crate_type = "lib"]
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#![feature(no_core, lang_items)]
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#![no_core]
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#[lang = "sized"]
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trait Sized {}
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#[no_mangle]
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pub fn foo() {
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// CHECK: @foo() unnamed_addr #0
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// unset-NOT: fn_ret_thunk_extern
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// keep-NOT: fn_ret_thunk_extern
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// thunk-extern: attributes #0 = { {{.*}}fn_ret_thunk_extern{{.*}} }
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// keep-thunk-extern: attributes #0 = { {{.*}}fn_ret_thunk_extern{{.*}} }
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// thunk-extern-keep-NOT: fn_ret_thunk_extern
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}
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