Add rustc libdir folders to dynamic linker search path

... so that we can run cargo-nextest with proc-macro projects on
Windows.

This commit also adds integration tests that run cargo-nextest with
a proc-macro project.

cargo-nextest/src/dispatch.rs

@@ -37,6 +37,7 @@ use nextest_runner::{
     target_runner::{PlatformRunner, TargetRunner},
     test_filter::{RunIgnored, TestFilterBuilder},
     write_str::WriteStr,
+    RustcCli,
 };
 use once_cell::sync::OnceCell;
 use owo_colors::{OwoColorize, Stream, Style};
@@ -1009,10 +1010,17 @@ impl BaseApp {
             Some(kind) => kind.binary_list.rust_build_meta.build_platforms.clone(),
             None => {
                 let mut build_platforms = BuildPlatforms::new()?;
+                if let Some(output) = RustcCli::print_host_libdir().read() {
+                    build_platforms.set_host_libdir_from_rustc_output(Cursor::new(output));
+                }
                 if let Some(triple) =
                     discover_target_triple(&cargo_configs, cargo_opts.target.as_deref())
                 {
-                    build_platforms.target = Some(BuildPlatformsTarget { triple });
+                    let mut target = BuildPlatformsTarget::new(triple.clone());
+                    if let Some(output) = RustcCli::print_target_libdir(&triple).read() {
+                        target.set_libdir_from_rustc_output(Cursor::new(output));
+                    }
+                    build_platforms.target = Some(target);
                 }
                 build_platforms
             }

fixtures/nextest-tests/Cargo.toml

@@ -34,6 +34,7 @@ members = [
     "derive",
     "dylib-test",
     "with-build-script",
+    "proc-macro-test"
 ]
 
 [dependencies]

fixtures/nextest-tests/proc-macro-test/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "proc-macro-test"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+proc-macro = true

integration-tests/Cargo.toml

@@ -36,3 +36,4 @@ once_cell = "1.19.0"
 regex = "1.10.4"
 serde_json = "1.0.117"
 insta = { version = "1.39.0", default-features = false }
+target-spec = { version = "3.1.0", features = ["custom", "summaries"] }

integration-tests/tests/integration/fixtures.rs

@@ -128,6 +128,7 @@ pub static EXPECTED_LIST: Lazy<Vec<TestInfo>> = Lazy::new(|| {
             BuildPlatform::Target,
             vec![("tests::test_out_dir_present", false)],
         ),
+        TestInfo::new("proc-macro-test", BuildPlatform::Host, vec![]),
     ]
 });
 
@@ -379,7 +380,20 @@ pub fn check_list_binaries_output(stdout: &[u8]) {
     let result: BinaryListSummary = serde_json::from_slice(stdout).unwrap();
 
     let test_suite = &*EXPECTED_LIST;
-    assert_eq!(test_suite.len(), result.rust_binaries.len());
+    let mut expected_binary_ids = test_suite
+        .iter()
+        .map(|test_info| test_info.id.clone())
+        .collect::<Vec<_>>();
+    expected_binary_ids.sort();
+    let mut actual_binary_ids = result.rust_binaries.keys().collect::<Vec<_>>();
+    actual_binary_ids.sort();
+    assert_eq!(
+        test_suite.len(),
+        result.rust_binaries.len(),
+        "expected rust binaries:\n{:?}\nactual rust binaries\n{:?}",
+        expected_binary_ids,
+        actual_binary_ids
+    );
 
     for test in test_suite {
         let entry = result

integration-tests/tests/integration/main.rs

@@ -23,8 +23,9 @@
 //! `NEXTEST_BIN_EXE_cargo-nextest-dup`.
 
 use camino::{Utf8Path, Utf8PathBuf};
-use nextest_metadata::{BuildPlatform, NextestExitCode};
+use nextest_metadata::{BuildPlatform, NextestExitCode, TestListSummary};
 use std::{fs::File, io::Write};
+use target_spec::Platform;
 
 mod fixtures;
 mod temp_project;
@@ -818,3 +819,16 @@ fn test_setup_script_error() {
         Some(NextestExitCode::SETUP_SCRIPT_FAILED)
     );
 }
+
+#[test]
+fn test_target_arg() {
+    let host_platform = Platform::current().expect("should detect the host target successfully");
+    let host_target = host_platform.triple_str();
+    let output = CargoNextestCli::new()
+        .args(["list", "--target", host_target, "--message-format", "json"])
+        .output();
+    let result: TestListSummary = serde_json::from_slice(&output.stdout).unwrap();
+    let build_platforms = &result.rust_build_meta.target_platforms_v2[0];
+    assert_eq!(build_platforms.target.triple, host_target);
+    assert_eq!(build_platforms.host_libdir, build_platforms.target_libdir);
+}

integration-tests/tests/integration/snapshots/integration__archive_includes.snap

@@ -2,7 +2,7 @@
 source: integration-tests/tests/integration/main.rs
 expression: output.stderr_as_str()
 ---
-   Archiving 16 binaries (including 2 non-test binaries), 2 build script output directories, 2 linked paths, and 7 extra paths to <archive-file>
+   Archiving 17 binaries (including 2 non-test binaries), 2 build script output directories, 2 linked paths, and 7 extra paths to <archive-file>
      Warning ignoring extra path `<target-dir>/excluded-dir` because it does not exist
      Warning ignoring extra path `<target-dir>/depth-0-dir` specified with depth 0 since it is a directory
      Warning ignoring extra path `<target-dir>/file_that_does_not_exist.txt` because it does not exist

integration-tests/tests/integration/snapshots/integration__archive_includes_without_uds.snap

@@ -2,7 +2,7 @@
 source: integration-tests/tests/integration/main.rs
 expression: output.stderr_as_str()
 ---
-   Archiving 16 binaries (including 2 non-test binaries), 2 build script output directories, 2 linked paths, and 7 extra paths to <archive-file>
+   Archiving 17 binaries (including 2 non-test binaries), 2 build script output directories, 2 linked paths, and 7 extra paths to <archive-file>
      Warning ignoring extra path `<target-dir>/excluded-dir` because it does not exist
      Warning ignoring extra path `<target-dir>/depth-0-dir` specified with depth 0 since it is a directory
      Warning ignoring extra path `<target-dir>/file_that_does_not_exist.txt` because it does not exist

integration-tests/tests/integration/snapshots/integration__archive_missing_includes.snap

@@ -2,7 +2,7 @@
 source: integration-tests/tests/integration/main.rs
 expression: output.stderr_as_str()
 ---
-   Archiving 16 binaries (including 2 non-test binaries), 2 build script output directories, 2 linked paths, and 1 extra path to <archive-file>
+   Archiving 17 binaries (including 2 non-test binaries), 2 build script output directories, 2 linked paths, and 1 extra path to <archive-file>
 error: error creating archive `<archive-file>`
 
 Caused by:

integration-tests/tests/integration/snapshots/integration__archive_no_includes.snap

@@ -2,7 +2,7 @@
 source: integration-tests/tests/integration/main.rs
 expression: output.stderr_as_str()
 ---
-   Archiving 16 binaries (including 2 non-test binaries), 2 build script output directories, and 2 linked paths to <archive-file>
+   Archiving 17 binaries (including 2 non-test binaries), 2 build script output directories, and 2 linked paths to <archive-file>
      Warning linked path `<target-dir>/debug/build/<cdylib-link-hash>/does-not-exist` not found, requested by: cdylib-link v0.1.0
              (this is a bug in this crate that should be fixed)
     Archived <file-count> files to <archive-file> in <duration>

nextest-metadata/src/test_list.rs

@@ -522,6 +522,18 @@ pub struct RustNonTestBinarySummary {
 pub struct BuildPlatformsSummary {
     /// The target platform, if specified.
     pub target: PlatformSummary,
+
+    /// The libdir for the host platform.
+    ///
+    /// Empty if failed to discover.
+    #[serde(default)]
+    pub host_libdir: Option<Utf8PathBuf>,
+
+    /// The libdir for the target platform.
+    ///
+    /// Empty if failed to discover.
+    #[serde(default)]
+    pub target_libdir: Option<Utf8PathBuf>,
 }
 
 /// Information about the kind of a Rust non-test binary.

nextest-runner/src/config/test_helpers.rs

@@ -86,12 +86,18 @@ pub(super) fn binary_query<'a>(
 pub(super) fn build_platforms() -> BuildPlatforms {
     BuildPlatforms {
         host: Platform::new("x86_64-unknown-linux-gnu", TargetFeatures::Unknown).unwrap(),
+        host_libdir: Some(
+            Utf8PathBuf::from("/home/fake/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib")
+        ),
         target: Some(BuildPlatformsTarget {
             triple: TargetTriple {
                 platform: Platform::new("aarch64-apple-darwin", TargetFeatures::Unknown).unwrap(),
                 source: TargetTripleSource::Env,
                 location: TargetDefinitionLocation::Builtin,
             },
+            libdir: Some(
+                Utf8PathBuf::from("/home/fake/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/aarch64-apple-darwin/lib")
+            ),
         }),
     }
 }

nextest-runner/src/list/binary_list.rs

@@ -427,9 +427,12 @@ mod tests {
             source: TargetTripleSource::CliOption,
             location: TargetDefinitionLocation::Builtin,
         };
+        let fake_libdir = "/home/fake/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib";
         let mut build_platforms = BuildPlatforms::new().unwrap();
+        build_platforms.host_libdir = Some(Utf8PathBuf::from(fake_libdir));
         build_platforms.target = Some(BuildPlatformsTarget {
             triple: fake_triple,
+            libdir: Some(Utf8PathBuf::from(fake_libdir)),
         });
         let build_platforms = build_platforms;
 
@@ -509,7 +512,9 @@ mod tests {
                 "target": {
                   "triple": "x86_64-unknown-linux-gnu",
                   "target-features": "unknown"
-                }
+                },
+                "host-libdir": "/home/fake/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib",
+                "target-libdir": "/home/fake/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib"
               }
             ],
             "target-platforms": [