Add helper function for checking LLD usage to run-make-support

src/tools/run-make-support/src/lib.rs

@@ -17,6 +17,7 @@ pub mod assertion_helpers;
 pub mod diff;
 pub mod env;
 pub mod external_deps;
+pub mod linker;
 pub mod path_helpers;
 pub mod run;
 pub mod scoped_run;

src/tools/run-make-support/src/linker.rs

@@ -0,0 +1,36 @@
+use regex::Regex;
+
+use crate::{Rustc, is_msvc};
+
+/// Asserts that `rustc` uses LLD for linking when executed.
+pub fn assert_rustc_uses_lld(rustc: &mut Rustc) {
+    let stderr = get_stderr_with_linker_messages(rustc);
+    assert!(
+        has_lld_version_in_logs(&stderr),
+        "LLD version should be present in rustc stderr:\n{stderr}"
+    );
+}
+
+/// Asserts that `rustc` doesn't use LLD for linking when executed.
+pub fn assert_rustc_doesnt_use_lld(rustc: &mut Rustc) {
+    let stderr = get_stderr_with_linker_messages(rustc);
+    assert!(
+        !has_lld_version_in_logs(&stderr),
+        "LLD version should NOT be present in rustc stderr:\n{stderr}"
+    );
+}
+
+fn get_stderr_with_linker_messages(rustc: &mut Rustc) -> String {
+    // lld-link is used if msvc, otherwise a gnu-compatible lld is used.
+    let linker_version_flag = if is_msvc() { "--version" } else { "-Wl,-v" };
+
+    let output = rustc.arg("-Wlinker-messages").link_arg(linker_version_flag).run();
+    output.stderr_utf8()
+}
+
+fn has_lld_version_in_logs(stderr: &str) -> bool {
+    // Strip the `-Wlinker-messages` wrappers prefixing the linker output.
+    let stderr = Regex::new(r"warning: linker std(out|err):").unwrap().replace_all(&stderr, "");
+    let lld_version_re = Regex::new(r"^LLD [0-9]+\.[0-9]+\.[0-9]+").unwrap();
+    stderr.lines().any(|line| lld_version_re.is_match(line.trim()))
+}

tests/run-make/rust-lld-by-default-beta-stable/rmake.rs

@@ -4,24 +4,11 @@
 //@ ignore-nightly
 //@ only-x86_64-unknown-linux-gnu
 
-use std::process::Output;
-
-use run_make_support::regex::Regex;
+use run_make_support::linker::assert_rustc_doesnt_use_lld;
 use run_make_support::rustc;
 
 fn main() {
     // A regular compilation should not 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 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()))
+    assert_rustc_doesnt_use_lld(rustc().input("main.rs"));
 }

tests/run-make/rust-lld-by-default-nightly/rmake.rs

@@ -6,35 +6,14 @@
 //@ ignore-stable
 //@ only-x86_64-unknown-linux-gnu
 
-use run_make_support::regex::Regex;
+use run_make_support::linker::{assert_rustc_doesnt_use_lld, assert_rustc_uses_lld};
 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()
-    );
+    assert_rustc_uses_lld(rustc().input("main.rs"));
 
     // 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()))
+    assert_rustc_doesnt_use_lld(rustc().arg("-Zlinker-features=-lld").input("main.rs"));
 }

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

@@ -8,43 +8,22 @@
 //@ needs-rust-lld
 //@ only-x86_64-unknown-linux-gnu
 
-use run_make_support::regex::Regex;
+use run_make_support::linker::{assert_rustc_doesnt_use_lld, assert_rustc_uses_lld};
 use run_make_support::rustc;
 
 fn main() {
     // Compile to a custom target spec with rust-lld enabled by default. We'll check that by asking
     // the linker to display its version number with a link-arg.
-    let output = rustc()
-        .crate_type("cdylib")
-        .arg("-Wlinker-messages")
-        .target("custom-target.json")
-        .link_arg("-Wl,-v")
-        .input("lib.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()
+    assert_rustc_uses_lld(
+        rustc().crate_type("cdylib").target("custom-target.json").input("lib.rs"),
     );
 
     // But it can also be disabled via linker features.
-    let output = rustc()
-        .crate_type("cdylib")
-        .arg("-Wlinker-messages")
-        .target("custom-target.json")
-        .arg("-Zlinker-features=-lld")
-        .link_arg("-Wl,-v")
-        .input("lib.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()
+    assert_rustc_doesnt_use_lld(
+        rustc()
+            .crate_type("cdylib")
+            .target("custom-target.json")
+            .arg("-Zlinker-features=-lld")
+            .input("lib.rs"),
     );
 }
-
-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()))
-}

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

@@ -4,64 +4,32 @@
 //@ needs-rust-lld
 //@ ignore-s390x lld does not yet support s390x as target
 
-use run_make_support::regex::Regex;
-use run_make_support::{is_msvc, rustc};
+use run_make_support::linker::{assert_rustc_doesnt_use_lld, assert_rustc_uses_lld};
+use run_make_support::rustc;
 
 fn main() {
-    // lld-link is used if msvc, otherwise a gnu-compatible lld is used.
-    let linker_version_flag = if is_msvc() { "--version" } else { "-Wl,-v" };
-
     // 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.
-    let output = rustc()
-        .arg("-Zlinker-features=+lld")
-        .arg("-Clink-self-contained=+linker")
-        .arg("-Zunstable-options")
-        .arg("-Wlinker-messages")
-        .link_arg(linker_version_flag)
-        .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()
+    assert_rustc_uses_lld(
+        rustc()
+            .arg("-Zlinker-features=+lld")
+            .arg("-Clink-self-contained=+linker")
+            .arg("-Zunstable-options")
+            .input("main.rs"),
     );
 
-    // It should not be used when we explicitly opt-out of lld.
-    let output = rustc()
-        .link_arg(linker_version_flag)
-        .arg("-Zlinker-features=-lld")
-        .arg("-Wlinker-messages")
-        .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()
-    );
+    // It should not be used when we explicitly opt out of lld.
+    assert_rustc_doesnt_use_lld(rustc().arg("-Zlinker-features=-lld").input("main.rs"));
 
     // While we're here, also check that the last linker feature flag "wins" when passed multiple
     // times to rustc.
-    let output = rustc()
-        .link_arg(linker_version_flag)
-        .arg("-Clink-self-contained=+linker")
-        .arg("-Zunstable-options")
-        .arg("-Zlinker-features=-lld")
-        .arg("-Zlinker-features=+lld")
-        .arg("-Zlinker-features=-lld,+lld")
-        .arg("-Wlinker-messages")
-        .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()
+    assert_rustc_uses_lld(
+        rustc()
+            .arg("-Clink-self-contained=+linker")
+            .arg("-Zunstable-options")
+            .arg("-Zlinker-features=-lld")
+            .arg("-Zlinker-features=+lld")
+            .arg("-Zlinker-features=-lld,+lld")
+            .input("main.rs"),
     );
 }
-
-fn find_lld_version_in_logs(stderr: String) -> bool {
-    // Strip the `-Wlinker-messages` wrappers prefixing the linker output.
-    let stderr = Regex::new(r"warning: linker std(out|err):").unwrap().replace_all(&stderr, "");
-    let lld_version_re = Regex::new(r"^LLD [0-9]+\.[0-9]+\.[0-9]+").unwrap();
-    stderr.lines().any(|line| lld_version_re.is_match(line.trim()))
-}