Add rustc folder to dynamic linker search path

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

This commit also adds integration tests for running cargo-nextest for
proc-macro projects.

cargo-nextest/src/dispatch.rs

@@ -45,6 +45,7 @@ use std::{
     collections::BTreeSet,
     env::VarError,
     io::{Cursor, Write},
+    path::PathBuf,
     sync::Arc,
 };
 use swrite::{swrite, SWrite};
@@ -1009,7 +1010,31 @@ impl BaseApp {
             None => {
                 let target_triple =
                     discover_target_triple(&cargo_configs, cargo_opts.target.as_deref());
-                BuildPlatforms::new(target_triple)?
+                let mut args = vec!["--print", "sysroot"];
+                if let Some(target_triple) = &target_triple {
+                    args.extend(["--target", target_triple.platform.triple_str()]);
+                }
+                let output = duct::cmd(rustc_path().as_str(), args)
+                    .stdout_capture()
+                    .unchecked()
+                    .run()
+                    .ok()
+                    .and_then(|output| {
+                        if output.status.success() {
+                            Some(Cursor::new(output.stdout))
+                        } else {
+                            log::debug!(
+                                "failed to execute sysroot discover command: {}",
+                                output.status
+                            );
+                            log::debug!("stdout:");
+                            log::debug!("{}", String::from_utf8_lossy(&output.stdout));
+                            log::debug!("stderr:");
+                            log::debug!("{}", String::from_utf8_lossy(&output.stderr));
+                            None
+                        }
+                    });
+                BuildPlatforms::new(output, target_triple)?
             }
         };
 
@@ -2012,6 +2037,15 @@ fn warn_on_err(thing: &str, err: &(dyn std::error::Error)) {
     log::warn!("{}", s);
 }
 
+fn rustc_path() -> Utf8PathBuf {
+    match std::env::var_os("RUSTC") {
+        Some(rustc_path) => PathBuf::from(rustc_path)
+            .try_into()
+            .expect("RUSTC env var is not valid UTF-8"),
+        None => Utf8PathBuf::from("rustc"),
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

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

fixtures/nextest-tests/proc-macro-test/src/lib.rs

@@ -0,0 +1 @@
+

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/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

@@ -519,6 +519,12 @@ pub struct BuildPlatformsSummary {
     /// In the future, this will become a list of target triples once multiple `--target` arguments
     /// are supported.
     pub target: PlatformSummary,
+
+    /// The sysroot for the target platform.
+    ///
+    /// Empty if fialed to discover.
+    #[serde(default)]
+    pub sysroot: Option<Utf8PathBuf>,
 }
 
 /// Information about the kind of a Rust non-test binary.

nextest-runner/src/config/test_helpers.rs

@@ -84,14 +84,18 @@ pub(super) fn binary_query<'a>(
 }
 
 pub(super) fn build_platforms() -> BuildPlatforms {
-    BuildPlatforms::new_with_host(
-        Platform::new("x86_64-unknown-linux-gnu", TargetFeatures::Unknown).unwrap(),
-        Some(TargetTriple {
+    BuildPlatforms {
+        host: Platform::new("x86_64-unknown-linux-gnu", TargetFeatures::Unknown).unwrap(),
+        target: Some(TargetTriple {
             platform: Platform::new("aarch64-apple-darwin", TargetFeatures::Unknown).unwrap(),
             source: TargetTripleSource::Env,
             location: TargetDefinitionLocation::Builtin,
         }),
-    )
+        sysroot: Some(
+            Utf8PathBuf::from("/home/fake/.rustup/toolchains/stable-x86_64-unknown-linux-gnu")
+                .into_boxed_path(),
+        ),
+    }
 }
 
 pub(super) fn test_group(name: &str) -> TestGroup {

nextest-runner/src/list/binary_list.rs

@@ -398,6 +398,7 @@ mod tests {
     use indoc::indoc;
     use maplit::btreeset;
     use pretty_assertions::assert_eq;
+    use std::io::Cursor;
     use target_spec::{Platform, TargetFeatures};
 
     #[test]
@@ -426,7 +427,9 @@ mod tests {
             source: TargetTripleSource::CliOption,
             location: TargetDefinitionLocation::Builtin,
         };
-        let build_platforms = BuildPlatforms::new(Some(fake_triple)).unwrap();
+        let fake_sysroot = "/home/fake/.rustup/toolchains/stable-x86_64-unknown-linux-gnu";
+        let build_platforms =
+            BuildPlatforms::new(Some(Cursor::new(fake_sysroot)), Some(fake_triple)).unwrap();
 
         let mut rust_build_meta = RustBuildMeta::new("/fake/target", build_platforms);
         rust_build_meta
@@ -504,7 +507,8 @@ mod tests {
                 "target": {
                   "triple": "x86_64-unknown-linux-gnu",
                   "target-features": "unknown"
-                }
+                },
+                "sysroot": "/home/fake/.rustup/toolchains/stable-x86_64-unknown-linux-gnu"
               }
             ],
             "target-platform": "x86_64-unknown-linux-gnu"

nextest-runner/src/list/rust_build_meta.rs

@@ -9,6 +9,7 @@ use crate::{
     reuse_build::PathMapper,
 };
 use camino::Utf8PathBuf;
+use itertools::Itertools;
 use nextest_metadata::{RustBuildMetaSummary, RustNonTestBinarySummary};
 use std::{
     collections::{BTreeMap, BTreeSet},
@@ -95,6 +96,7 @@ impl RustBuildMeta<TestListState> {
             build_platforms: BuildPlatforms {
                 host: Platform::current().unwrap(),
                 target: None,
+                sysroot: None,
             },
         }
     }
@@ -109,6 +111,9 @@ impl RustBuildMeta<TestListState> {
         // FIXME/HELP WANTED: get the rustc sysroot library path here.
         // See https://github.com/nextest-rs/nextest/issues/267.
 
+        if self.build_platforms.sysroot.is_none() {
+            log::warn!("failed to detect the rustc sysroot, may fail to list or run tests");
+        }
         // Cargo puts linked paths before base output directories.
         self.linked_paths
             .keys()
@@ -127,6 +132,15 @@ impl RustBuildMeta<TestListState> {
                 // This is the order paths are added in by Cargo.
                 [with_deps, abs_base]
             }))
+            // Add the rustc path to the search paths to run procudure macro binaries. See
+            // details in https://github.com/nextest-rs/nextest/issues/1493.
+            .chain(
+                self.build_platforms
+                    .sysroot
+                    .as_ref()
+                    .map(|sysroot| sysroot.to_path_buf().join("bin")),
+            )
+            .unique()
             .collect()
     }
 }
@@ -169,3 +183,54 @@ impl<State> RustBuildMeta<State> {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::{fs, io::Cursor};
+
+    #[test]
+    fn test_dylib_paths_should_include_rustc_dir() {
+        let rust_sysroot = Utf8PathBuf::from("/fake/rustc/sysroot");
+        let rustc_dir = rust_sysroot.join("bin");
+
+        let rust_build_meta = RustBuildMeta {
+            build_platforms: BuildPlatforms::new(Some(Cursor::new(rust_sysroot.as_str())), None)
+                .expect("Should create BuildPlatforms with fake sysroot successfully"),
+            ..RustBuildMeta::empty()
+        };
+        let dylib_paths = rust_build_meta.dylib_paths();
+
+        assert!(
+            dylib_paths.contains(&rustc_dir),
+            "{:?} should contain {}",
+            dylib_paths,
+            rustc_dir
+        );
+    }
+
+    #[test]
+    fn test_dylib_paths_should_not_contain_duplicate_paths() {
+        let tmpdir = camino_tempfile::tempdir().expect("should create temp dir successfully");
+        let rust_sysroot = tmpdir.path().to_path_buf();
+        let rustc_dir = rust_sysroot.join("bin");
+        fs::create_dir(&rustc_dir)
+            .expect("should create bin directory in the tmp folder successfully");
+
+        let rust_build_meta = RustBuildMeta {
+            target_directory: rust_sysroot.clone(),
+            linked_paths: [(Utf8PathBuf::from("bin"), Default::default())].into(),
+            base_output_directories: [Utf8PathBuf::from("bin")].into(),
+            build_platforms: BuildPlatforms::new(Some(Cursor::new(rust_sysroot.as_str())), None)
+                .expect("Should create BuildPlatforms with fake sysroot successfully"),
+            ..RustBuildMeta::empty()
+        };
+        let dylib_paths = rust_build_meta.dylib_paths();
+
+        assert!(
+            dylib_paths.clone().into_iter().all_unique(),
+            "{:?} should not contain duplicate paths",
+            dylib_paths
+        );
+    }
+}

nextest-runner/src/list/test_list.rs

@@ -968,7 +968,7 @@ mod tests {
     use nextest_filtering::FilteringExpr;
     use nextest_metadata::{FilterMatch, MismatchReason};
     use pretty_assertions::assert_eq;
-    use std::iter;
+    use std::{io::Cursor, iter};
     use target_spec::Platform;
 
     #[test]
@@ -1033,7 +1033,9 @@ mod tests {
             source: TargetTripleSource::CliOption,
             location: TargetDefinitionLocation::Builtin,
         };
-        let build_platforms = BuildPlatforms::new(Some(fake_triple)).unwrap();
+        let fake_sysroot = "/home/fake/.rustup/toolchains/stable-x86_64-unknown-linux-gnu";
+        let build_platforms =
+            BuildPlatforms::new(Some(Cursor::new(fake_sysroot)), Some(fake_triple)).unwrap();
         let fake_env = EnvironmentMap::empty();
         let rust_build_meta =
             RustBuildMeta::new("/fake", build_platforms).map_paths(&PathMapper::noop());
@@ -1144,7 +1146,8 @@ mod tests {
                     "target": {
                       "triple": "aarch64-unknown-linux-gnu",
                       "target-features": "unknown"
-                    }
+                    },
+                    "sysroot": "/home/fake/.rustup/toolchains/stable-x86_64-unknown-linux-gnu"
                   }
                 ],
                 "target-platform": "aarch64-unknown-linux-gnu"