rust/tests/run-make/rust-lld/rmake.rs

// Test linking using `cc` with `rust-lld`, using the `-Clinker-features` and
// `-Clink-self-contained` CLI flags.

//@ needs-rust-lld
//@ ignore-s390x lld does not yet support s390x as target

use run_make_support::linker::{assert_rustc_doesnt_use_lld, assert_rustc_uses_lld};
use run_make_support::rustc;

fn main() {
    // Opt-in to lld and the self-contained linker, to link with rust-lld. We'll check that by
    // asking the linker to display its version number with a link-arg.
    assert_rustc_uses_lld(
        rustc()
            .arg("-Clinker-features=+lld")
            .arg("-Clink-self-contained=+linker")
            .arg("-Zunstable-options") // the opt-ins are unstable
            .input("main.rs"),
    );

    // It should not be used when we explicitly opt out of lld.
    assert_rustc_doesnt_use_lld(
        rustc().arg("-Clinker-features=-lld").arg("-Zunstable-options").input("main.rs"),
    );

    // While we're here, also check that the last linker feature flag "wins" when passed multiple
    // times to rustc.
    assert_rustc_uses_lld(
        rustc()
            .arg("-Clink-self-contained=+linker")
            .arg("-Zunstable-options")
            .arg("-Clinker-features=-lld")
            .arg("-Clinker-features=+lld")
            .arg("-Clinker-features=-lld,+lld")
            .input("main.rs"),
    );
}