Separate compilation artifacts by toolchain

dylint/src/lib.rs

@@ -3,6 +3,7 @@
 #![deny(clippy::panic)]
 
 use anyhow::{anyhow, bail, ensure, Context, Result};
+use cargo_metadata::MetadataCommand;
 use dylint_internal::env::{self, var};
 use lazy_static::lazy_static;
 use std::{
@@ -428,9 +429,11 @@ fn check(
     let clippy_disable_docs_links = clippy_disable_docs_links()?;
 
     for (toolchain, paths) in resolved {
+        let target_dir = target_dir(opts, toolchain)?;
+        let target_dir_str = target_dir.to_string_lossy();
         let driver = driver_builder::get(opts, toolchain)?;
         let dylint_libs = serde_json::to_string(&paths)?;
-        let mut args = vec![];
+        let mut args = vec!["--target-dir", &target_dir_str];
         if let Some(path) = &opts.manifest_path {
             args.extend(&["--manifest-path", path]);
         }
@@ -470,6 +473,20 @@ fn check(
     Ok(())
 }
 
+fn target_dir(opts: &Dylint, toolchain: &str) -> Result<PathBuf> {
+    let mut command = MetadataCommand::new();
+    if let Some(path) = &opts.manifest_path {
+        command.manifest_path(path);
+    }
+    let metadata = command.no_deps().exec()?;
+    Ok(metadata
+        .target_directory
+        .join("dylint")
+        .join("target")
+        .join(toolchain)
+        .into())
+}
+
 fn flatten_toolchain_map(toolchain_map: &ToolchainMap) -> Vec<(String, PathBuf)> {
     toolchain_map
         .iter()

dylint/src/metadata.rs

@@ -313,6 +313,7 @@ fn target_dir(metadata: &Metadata, package_root: &Path, _package_id: PackageId)
     Ok(metadata
         .target_directory
         .join("dylint")
+        .join("libraries")
         .join(toolchain)
         // .join(pkg_dir(package_root, package_id))
         .into())