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// Ensure that rust-lld is used as the default linker on `x86_64-unknown-linux-gnu` on the nightly
// channel, and that it can also be turned off with a CLI flag.
//@ needs-rust-lld
//@ ignore-beta
//@ ignore-stable
//@ only-x86_64-unknown-linux-gnu
use run_make_support::regex::Regex;
use run_make_support::rustc;
fn main() {
// A regular compilation should use rust-lld by default. We'll check that by asking the linker
// to display its version number with a link-arg.
let output = rustc().arg("-Wlinker-messages").link_arg("-Wl,-v").input("main.rs").run();
assert!(
find_lld_version_in_logs(output.stderr_utf8()),
"the LLD version string should be present in the output logs:\n{}",
output.stderr_utf8()
);
// But it can still be disabled by turning the linker feature off.
let output = rustc()
.arg("-Wlinker-messages")
.link_arg("-Wl,-v")
.arg("-Zlinker-features=-lld")
.input("main.rs")
.run();
assert!(
!find_lld_version_in_logs(output.stderr_utf8()),
"the LLD version string should not be present in the output logs:\n{}",
output.stderr_utf8()
);
}
fn find_lld_version_in_logs(stderr: String) -> bool {
let lld_version_re =
Regex::new(r"^warning: linker stdout: LLD [0-9]+\.[0-9]+\.[0-9]+").unwrap();
stderr.lines().any(|line| lld_version_re.is_match(line.trim()))
}
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