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test(build-std): Add test for LTO #16277

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Nov 20, 2025
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test(build-std): Add test for LTO #16277

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31 changes: 31 additions & 0 deletions tests/build-std/main.rs
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@weihanglo weihanglo Nov 19, 2025

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Would you mind briefly explaining (or copy) the regression a bit in the PR description as well?

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@weihanglo weihanglo Nov 19, 2025

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Would also be helpful to have a code comment around the test, as the test has a bit of distance from Cargo itself.

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@dianqk dianqk Nov 20, 2025

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Updated.

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@weihanglo weihanglo Nov 20, 2025

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Thanks for providing the context!

Original file line number Diff line number Diff line change
Expand Up @@ -187,6 +187,37 @@ fn basic() {
assert_eq!(p.glob(deps_dir.join("*.dylib")).count(), 0);
}

#[cargo_test(build_std_real)]
fn lto() {
// Checks that `-Zbuild-std` can work with `lto = "thin"`.
// This regression is from https://github.com/rust-lang/rust/issues/146109.
let p = project()
.file(
"Cargo.toml",
r#"
[package]
name = "foo"
version = "0.1.0"
edition = "2021"

[profile.dev]
lto = "thin"
"#,
)
.file(
"src/main.rs",
r#"
fn main() {}
"#,
)
.build();

p.cargo("build")
.build_std_arg("std")
.env("RUSTFLAGS", "-C linker-features=-lld")
.run();
}

#[cargo_test(build_std_real)]
fn host_proc_macro() {
let p = project()
Expand Down