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-rw-r--r--build_system/abi_cafe.rs15
-rw-r--r--build_system/build_backend.rs7
-rw-r--r--build_system/build_sysroot.rs42
-rw-r--r--build_system/mod.rs57
-rw-r--r--build_system/path.rs39
-rw-r--r--build_system/prepare.rs75
-rw-r--r--build_system/tests.rs86
-rw-r--r--build_system/utils.rs44
8 files changed, 207 insertions, 158 deletions
diff --git a/build_system/abi_cafe.rs b/build_system/abi_cafe.rs
index acb2bd5aeae..a081fdaa1c7 100644
--- a/build_system/abi_cafe.rs
+++ b/build_system/abi_cafe.rs
@@ -2,6 +2,7 @@ use std::path::Path;
 
 use super::build_sysroot;
 use super::config;
+use super::path::Dirs;
 use super::prepare::GitRepo;
 use super::utils::{spawn_and_wait, CargoProject, Compiler};
 use super::SysrootKind;
@@ -14,6 +15,7 @@ static ABI_CAFE: CargoProject = CargoProject::new(&ABI_CAFE_REPO.source_dir(), "
 pub(crate) fn run(
     channel: &str,
     sysroot_kind: SysrootKind,
+    dirs: &Dirs,
     cg_clif_dylib: &Path,
     host_triple: &str,
     target_triple: &str,
@@ -29,19 +31,26 @@ pub(crate) fn run(
     }
 
     eprintln!("Building sysroot for abi-cafe");
-    build_sysroot::build_sysroot(channel, sysroot_kind, cg_clif_dylib, host_triple, target_triple);
+    build_sysroot::build_sysroot(
+        dirs,
+        channel,
+        sysroot_kind,
+        cg_clif_dylib,
+        host_triple,
+        target_triple,
+    );
 
     eprintln!("Running abi-cafe");
 
     let pairs = ["rustc_calls_cgclif", "cgclif_calls_rustc", "cgclif_calls_cc", "cc_calls_cgclif"];
 
-    let mut cmd = ABI_CAFE.run(&Compiler::host());
+    let mut cmd = ABI_CAFE.run(&Compiler::host(), dirs);
     cmd.arg("--");
     cmd.arg("--pairs");
     cmd.args(pairs);
     cmd.arg("--add-rustc-codegen-backend");
     cmd.arg(format!("cgclif:{}", cg_clif_dylib.display()));
-    cmd.current_dir(ABI_CAFE.source_dir());
+    cmd.current_dir(ABI_CAFE.source_dir(dirs));
 
     spawn_and_wait(cmd);
 }
diff --git a/build_system/build_backend.rs b/build_system/build_backend.rs
index 5cbeb7d0f9f..fde8ef424cc 100644
--- a/build_system/build_backend.rs
+++ b/build_system/build_backend.rs
@@ -1,18 +1,19 @@
 use std::env;
 use std::path::PathBuf;
 
-use super::path::RelPath;
+use super::path::{Dirs, RelPath};
 use super::rustc_info::get_file_name;
 use super::utils::{is_ci, CargoProject, Compiler};
 
 static CG_CLIF: CargoProject = CargoProject::new(&RelPath::SOURCE, "cg_clif");
 
 pub(crate) fn build_backend(
+    dirs: &Dirs,
     channel: &str,
     host_triple: &str,
     use_unstable_features: bool,
 ) -> PathBuf {
-    let mut cmd = CG_CLIF.build(&Compiler::host());
+    let mut cmd = CG_CLIF.build(&Compiler::host(), dirs);
 
     cmd.env("CARGO_BUILD_INCREMENTAL", "true"); // Force incr comp even in release mode
 
@@ -44,7 +45,7 @@ pub(crate) fn build_backend(
     super::utils::spawn_and_wait(cmd);
 
     CG_CLIF
-        .target_dir()
+        .target_dir(dirs)
         .join(host_triple)
         .join(channel)
         .join(get_file_name("rustc_codegen_cranelift", "dylib"))
diff --git a/build_system/build_sysroot.rs b/build_system/build_sysroot.rs
index fcd668b8aa5..35c972e6b38 100644
--- a/build_system/build_sysroot.rs
+++ b/build_system/build_sysroot.rs
@@ -2,7 +2,7 @@ use std::fs;
 use std::path::Path;
 use std::process::{self, Command};
 
-use super::path::RelPath;
+use super::path::{Dirs, RelPath};
 use super::rustc_info::{get_file_name, get_rustc_version, get_wrapper_file_name};
 use super::utils::{spawn_and_wait, try_hard_link, CargoProject, Compiler};
 use super::SysrootKind;
@@ -13,6 +13,7 @@ static LIB_DIR: RelPath = RelPath::DIST.join("lib");
 static RUSTLIB_DIR: RelPath = LIB_DIR.join("rustlib");
 
 pub(crate) fn build_sysroot(
+    dirs: &Dirs,
     channel: &str,
     sysroot_kind: SysrootKind,
     cg_clif_dylib_src: &Path,
@@ -21,9 +22,9 @@ pub(crate) fn build_sysroot(
 ) {
     eprintln!("[BUILD] sysroot {:?}", sysroot_kind);
 
-    DIST_DIR.ensure_fresh();
-    BIN_DIR.ensure_exists();
-    LIB_DIR.ensure_exists();
+    DIST_DIR.ensure_fresh(dirs);
+    BIN_DIR.ensure_exists(dirs);
+    LIB_DIR.ensure_exists(dirs);
 
     // Copy the backend
     let cg_clif_dylib_path = if cfg!(windows) {
@@ -33,7 +34,7 @@ pub(crate) fn build_sysroot(
     } else {
         LIB_DIR
     }
-    .to_path()
+    .to_path(dirs)
     .join(get_file_name("rustc_codegen_cranelift", "dylib"));
     try_hard_link(cg_clif_dylib_src, &cg_clif_dylib_path);
 
@@ -43,17 +44,17 @@ pub(crate) fn build_sysroot(
 
         let mut build_cargo_wrapper_cmd = Command::new("rustc");
         build_cargo_wrapper_cmd
-            .arg(RelPath::SCRIPTS.to_path().join(&format!("{wrapper}.rs")))
+            .arg(RelPath::SCRIPTS.to_path(dirs).join(&format!("{wrapper}.rs")))
             .arg("-o")
-            .arg(DIST_DIR.to_path().join(wrapper_name))
+            .arg(DIST_DIR.to_path(dirs).join(wrapper_name))
             .arg("-g");
         spawn_and_wait(build_cargo_wrapper_cmd);
     }
 
     let default_sysroot = super::rustc_info::get_default_sysroot();
 
-    let host_rustlib_lib = RUSTLIB_DIR.to_path().join(host_triple).join("lib");
-    let target_rustlib_lib = RUSTLIB_DIR.to_path().join(target_triple).join("lib");
+    let host_rustlib_lib = RUSTLIB_DIR.to_path(dirs).join(host_triple).join("lib");
+    let target_rustlib_lib = RUSTLIB_DIR.to_path(dirs).join(target_triple).join("lib");
     fs::create_dir_all(&host_rustlib_lib).unwrap();
     fs::create_dir_all(&target_rustlib_lib).unwrap();
 
@@ -114,7 +115,7 @@ pub(crate) fn build_sysroot(
             }
         }
         SysrootKind::Clif => {
-            build_clif_sysroot_for_triple(channel, host_triple, &cg_clif_dylib_path, None);
+            build_clif_sysroot_for_triple(dirs, channel, host_triple, &cg_clif_dylib_path, None);
 
             if host_triple != target_triple {
                 // When cross-compiling it is often necessary to manually pick the right linker
@@ -123,7 +124,13 @@ pub(crate) fn build_sysroot(
                 } else {
                     None
                 };
-                build_clif_sysroot_for_triple(channel, target_triple, &cg_clif_dylib_path, linker);
+                build_clif_sysroot_for_triple(
+                    dirs,
+                    channel,
+                    target_triple,
+                    &cg_clif_dylib_path,
+                    linker,
+                );
             }
 
             // Copy std for the host to the lib dir. This is necessary for the jit mode to find
@@ -132,7 +139,7 @@ pub(crate) fn build_sysroot(
                 let file = file.unwrap().path();
                 let filename = file.file_name().unwrap().to_str().unwrap();
                 if filename.contains("std-") && !filename.contains(".rlib") {
-                    try_hard_link(&file, LIB_DIR.to_path().join(file.file_name().unwrap()));
+                    try_hard_link(&file, LIB_DIR.to_path(dirs).join(file.file_name().unwrap()));
                 }
             }
         }
@@ -145,12 +152,13 @@ pub(crate) static SYSROOT_SRC: RelPath = RelPath::BUILD_SYSROOT.join("sysroot_sr
 static STANDARD_LIBRARY: CargoProject = CargoProject::new(&RelPath::BUILD_SYSROOT, "build_sysroot");
 
 fn build_clif_sysroot_for_triple(
+    dirs: &Dirs,
     channel: &str,
     triple: &str,
     cg_clif_dylib_path: &Path,
     linker: Option<&str>,
 ) {
-    match fs::read_to_string(SYSROOT_RUSTC_VERSION.to_path()) {
+    match fs::read_to_string(SYSROOT_RUSTC_VERSION.to_path(dirs)) {
         Err(e) => {
             eprintln!("Failed to get rustc version for patched sysroot source: {}", e);
             eprintln!("Hint: Try `./y.rs prepare` to patch the sysroot source");
@@ -168,7 +176,7 @@ fn build_clif_sysroot_for_triple(
         }
     }
 
-    let build_dir = STANDARD_LIBRARY.target_dir().join(triple).join(channel);
+    let build_dir = STANDARD_LIBRARY.target_dir(dirs).join(triple).join(channel);
 
     if !super::config::get_bool("keep_sysroot") {
         // Cleanup the deps dir, but keep build scripts and the incremental cache for faster
@@ -181,7 +189,7 @@ fn build_clif_sysroot_for_triple(
     // Build sysroot
     let mut rustflags = "-Zforce-unstable-if-unmarked -Cpanic=abort".to_string();
     rustflags.push_str(&format!(" -Zcodegen-backend={}", cg_clif_dylib_path.to_str().unwrap()));
-    rustflags.push_str(&format!(" --sysroot={}", DIST_DIR.to_path().to_str().unwrap()));
+    rustflags.push_str(&format!(" --sysroot={}", DIST_DIR.to_path(dirs).to_str().unwrap()));
     if channel == "release" {
         rustflags.push_str(" -Zmir-opt-level=3");
     }
@@ -191,7 +199,7 @@ fn build_clif_sysroot_for_triple(
     }
     let mut compiler = Compiler::with_triple(triple.to_owned());
     compiler.rustflags = rustflags;
-    let mut build_cmd = STANDARD_LIBRARY.build(&compiler);
+    let mut build_cmd = STANDARD_LIBRARY.build(&compiler, dirs);
     if channel == "release" {
         build_cmd.arg("--release");
     }
@@ -210,7 +218,7 @@ fn build_clif_sysroot_for_triple(
         };
         try_hard_link(
             entry.path(),
-            RUSTLIB_DIR.to_path().join(triple).join("lib").join(entry.file_name()),
+            RUSTLIB_DIR.to_path(dirs).join(triple).join("lib").join(entry.file_name()),
         );
     }
 }
diff --git a/build_system/mod.rs b/build_system/mod.rs
index cc789c8f10b..b36df96c0b2 100644
--- a/build_system/mod.rs
+++ b/build_system/mod.rs
@@ -1,5 +1,4 @@
 use std::env;
-use std::path::PathBuf;
 use std::process;
 
 use self::utils::is_ci;
@@ -17,12 +16,8 @@ mod utils;
 fn usage() {
     eprintln!("Usage:");
     eprintln!("  ./y.rs prepare");
-    eprintln!(
-        "  ./y.rs build [--debug] [--sysroot none|clif|llvm] [--dist-dir DIR] [--no-unstable-features]"
-    );
-    eprintln!(
-        "  ./y.rs test [--debug] [--sysroot none|clif|llvm] [--dist-dir DIR] [--no-unstable-features]"
-    );
+    eprintln!("  ./y.rs build [--debug] [--sysroot none|clif|llvm] [--no-unstable-features]");
+    eprintln!("  ./y.rs test [--debug] [--sysroot none|clif|llvm] [--no-unstable-features]");
 }
 
 macro_rules! arg_error {
@@ -50,13 +45,22 @@ pub fn main() {
     env::set_var("CG_CLIF_DISPLAY_CG_TIME", "1");
     env::set_var("CG_CLIF_DISABLE_INCR_CACHE", "1");
 
-    std::fs::create_dir_all("build").unwrap();
+    let current_dir = std::env::current_dir().unwrap();
+    let dirs = path::Dirs {
+        source_dir: current_dir.clone(),
+        download_dir: current_dir.join("download"),
+        build_dir: current_dir.join("build"),
+        dist_dir: current_dir.join("dist"),
+    };
+
+    path::RelPath::BUILD.ensure_exists(&dirs);
 
     {
         // Make sure we always explicitly specify the target dir
-        let target = "build/target_dir_should_be_set_explicitly";
-        env::set_var("CARGO_TARGET_DIR", target);
-        let _ = std::fs::remove_file(target);
+        let target =
+            path::RelPath::BUILD.join("target_dir_should_be_set_explicitly").to_path(&dirs);
+        env::set_var("CARGO_TARGET_DIR", &target);
+        let _ = std::fs::remove_file(&target);
         std::fs::File::create(target).unwrap();
     }
 
@@ -71,7 +75,7 @@ pub fn main() {
             if args.next().is_some() {
                 arg_error!("./y.rs prepare doesn't expect arguments");
             }
-            prepare::prepare();
+            prepare::prepare(&dirs);
             process::exit(0);
         }
         Some("build") => Command::Build,
@@ -84,17 +88,11 @@ pub fn main() {
         }
     };
 
-    let mut dist_dir = PathBuf::from("dist");
     let mut channel = "release";
     let mut sysroot_kind = SysrootKind::Clif;
     let mut use_unstable_features = true;
     while let Some(arg) = args.next().as_deref() {
         match arg {
-            "--dist-dir" => {
-                dist_dir = PathBuf::from(args.next().unwrap_or_else(|| {
-                    arg_error!("--dist-dir requires argument");
-                }))
-            }
             "--debug" => channel = "debug",
             "--sysroot" => {
                 sysroot_kind = match args.next().as_deref() {
@@ -110,7 +108,6 @@ pub fn main() {
             arg => arg_error!("Unexpected argument {}", arg),
         }
     }
-    dist_dir = std::env::current_dir().unwrap().join(dist_dir);
 
     let host_triple = if let Ok(host_triple) = std::env::var("HOST_TRIPLE") {
         host_triple
@@ -131,15 +128,31 @@ pub fn main() {
         host_triple.clone()
     };
 
-    let cg_clif_dylib = build_backend::build_backend(channel, &host_triple, use_unstable_features);
+    let cg_clif_dylib =
+        build_backend::build_backend(&dirs, channel, &host_triple, use_unstable_features);
     match command {
         Command::Test => {
-            tests::run_tests(channel, sysroot_kind, &cg_clif_dylib, &host_triple, &target_triple);
+            tests::run_tests(
+                &dirs,
+                channel,
+                sysroot_kind,
+                &cg_clif_dylib,
+                &host_triple,
+                &target_triple,
+            );
 
-            abi_cafe::run(channel, sysroot_kind, &cg_clif_dylib, &host_triple, &target_triple);
+            abi_cafe::run(
+                channel,
+                sysroot_kind,
+                &dirs,
+                &cg_clif_dylib,
+                &host_triple,
+                &target_triple,
+            );
         }
         Command::Build => {
             build_sysroot::build_sysroot(
+                &dirs,
                 channel,
                 sysroot_kind,
                 &cg_clif_dylib,
diff --git a/build_system/path.rs b/build_system/path.rs
index 73a17a3980f..e93981f1d64 100644
--- a/build_system/path.rs
+++ b/build_system/path.rs
@@ -1,12 +1,13 @@
 use std::fs;
 use std::path::PathBuf;
 
-/*pub(crate) struct Paths {
-    source_dir: PathBuf,
-    download_dir: PathBuf,
-    build_dir: PathBuf,
-    dist_dir: PathBuf,
-}*/
+#[derive(Debug, Clone)]
+pub(crate) struct Dirs {
+    pub(crate) source_dir: PathBuf,
+    pub(crate) download_dir: PathBuf,
+    pub(crate) build_dir: PathBuf,
+    pub(crate) dist_dir: PathBuf,
+}
 
 #[doc(hidden)]
 #[derive(Debug, Copy, Clone)]
@@ -18,14 +19,12 @@ pub(crate) enum PathBase {
 }
 
 impl PathBase {
-    fn to_path(self) -> PathBuf {
-        // FIXME pass in all paths instead
-        let current_dir = std::env::current_dir().unwrap();
+    fn to_path(self, dirs: &Dirs) -> PathBuf {
         match self {
-            PathBase::Source => current_dir,
-            PathBase::Download => current_dir.join("download"),
-            PathBase::Build => current_dir.join("build"),
-            PathBase::Dist => current_dir.join("dist"),
+            PathBase::Source => dirs.source_dir.clone(),
+            PathBase::Download => dirs.download_dir.clone(),
+            PathBase::Build => dirs.build_dir.clone(),
+            PathBase::Dist => dirs.dist_dir.clone(),
         }
     }
 }
@@ -50,19 +49,19 @@ impl RelPath {
         RelPath::Join(self, suffix)
     }
 
-    pub(crate) fn to_path(&self) -> PathBuf {
+    pub(crate) fn to_path(&self, dirs: &Dirs) -> PathBuf {
         match self {
-            RelPath::Base(base) => base.to_path(),
-            RelPath::Join(base, suffix) => base.to_path().join(suffix),
+            RelPath::Base(base) => base.to_path(dirs),
+            RelPath::Join(base, suffix) => base.to_path(dirs).join(suffix),
         }
     }
 
-    pub(crate) fn ensure_exists(&self) {
-        fs::create_dir_all(self.to_path()).unwrap();
+    pub(crate) fn ensure_exists(&self, dirs: &Dirs) {
+        fs::create_dir_all(self.to_path(dirs)).unwrap();
     }
 
-    pub(crate) fn ensure_fresh(&self) {
-        let path = self.to_path();
+    pub(crate) fn ensure_fresh(&self, dirs: &Dirs) {
+        let path = self.to_path(dirs);
         if path.exists() {
             fs::remove_dir_all(&path).unwrap();
         }
diff --git a/build_system/prepare.rs b/build_system/prepare.rs
index 09568aae9f3..0eaa8e820ba 100644
--- a/build_system/prepare.rs
+++ b/build_system/prepare.rs
@@ -4,66 +4,69 @@ use std::path::{Path, PathBuf};
 use std::process::Command;
 
 use super::build_sysroot::{SYSROOT_RUSTC_VERSION, SYSROOT_SRC};
-use super::path::RelPath;
+use super::path::{Dirs, RelPath};
 use super::rustc_info::{get_file_name, get_rustc_path, get_rustc_version};
 use super::utils::{copy_dir_recursively, spawn_and_wait, Compiler};
 
-pub(crate) fn prepare() {
-    if RelPath::DOWNLOAD.to_path().exists() {
-        std::fs::remove_dir_all(RelPath::DOWNLOAD.to_path()).unwrap();
+pub(crate) fn prepare(dirs: &Dirs) {
+    if RelPath::DOWNLOAD.to_path(dirs).exists() {
+        std::fs::remove_dir_all(RelPath::DOWNLOAD.to_path(dirs)).unwrap();
     }
-    std::fs::create_dir_all(RelPath::DOWNLOAD.to_path()).unwrap();
+    std::fs::create_dir_all(RelPath::DOWNLOAD.to_path(dirs)).unwrap();
 
-    prepare_sysroot();
+    prepare_sysroot(dirs);
 
     // FIXME maybe install this only locally?
     eprintln!("[INSTALL] hyperfine");
     Command::new("cargo").arg("install").arg("hyperfine").spawn().unwrap().wait().unwrap();
 
-    super::abi_cafe::ABI_CAFE_REPO.fetch();
-    super::tests::RAND_REPO.fetch();
-    super::tests::REGEX_REPO.fetch();
-    super::tests::PORTABLE_SIMD_REPO.fetch();
-    super::tests::SIMPLE_RAYTRACER_REPO.fetch();
+    super::abi_cafe::ABI_CAFE_REPO.fetch(dirs);
+    super::tests::RAND_REPO.fetch(dirs);
+    super::tests::REGEX_REPO.fetch(dirs);
+    super::tests::PORTABLE_SIMD_REPO.fetch(dirs);
+    super::tests::SIMPLE_RAYTRACER_REPO.fetch(dirs);
 
     eprintln!("[LLVM BUILD] simple-raytracer");
     let host_compiler = Compiler::host();
-    let build_cmd = super::tests::SIMPLE_RAYTRACER.build(&host_compiler);
+    let build_cmd = super::tests::SIMPLE_RAYTRACER.build(&host_compiler, dirs);
     spawn_and_wait(build_cmd);
     fs::copy(
         super::tests::SIMPLE_RAYTRACER
-            .target_dir()
+            .target_dir(dirs)
             .join(&host_compiler.triple)
             .join("debug")
             .join(get_file_name("main", "bin")),
-        RelPath::BUILD.to_path().join(get_file_name("raytracer_cg_llvm", "bin")),
+        RelPath::BUILD.to_path(dirs).join(get_file_name("raytracer_cg_llvm", "bin")),
     )
     .unwrap();
 }
 
-fn prepare_sysroot() {
+fn prepare_sysroot(dirs: &Dirs) {
     let rustc_path = get_rustc_path();
     let sysroot_src_orig = rustc_path.parent().unwrap().join("../lib/rustlib/src/rust");
     let sysroot_src = SYSROOT_SRC;
 
     assert!(sysroot_src_orig.exists());
 
-    sysroot_src.ensure_fresh();
-    fs::create_dir_all(sysroot_src.to_path().join("library")).unwrap();
+    sysroot_src.ensure_fresh(dirs);
+    fs::create_dir_all(sysroot_src.to_path(dirs).join("library")).unwrap();
     eprintln!("[COPY] sysroot src");
-    copy_dir_recursively(&sysroot_src_orig.join("library"), &sysroot_src.to_path().join("library"));
+    copy_dir_recursively(
+        &sysroot_src_orig.join("library"),
+        &sysroot_src.to_path(dirs).join("library"),
+    );
 
     let rustc_version = get_rustc_version();
-    fs::write(SYSROOT_RUSTC_VERSION.to_path(), &rustc_version).unwrap();
+    fs::write(SYSROOT_RUSTC_VERSION.to_path(dirs), &rustc_version).unwrap();
 
     eprintln!("[GIT] init");
     let mut git_init_cmd = Command::new("git");
-    git_init_cmd.arg("init").arg("-q").current_dir(sysroot_src.to_path());
+    git_init_cmd.arg("init").arg("-q").current_dir(sysroot_src.to_path(dirs));
     spawn_and_wait(git_init_cmd);
 
-    init_git_repo(&sysroot_src.to_path());
+    init_git_repo(&sysroot_src.to_path(dirs));
 
-    apply_patches("sysroot", &sysroot_src.to_path());
+    apply_patches(dirs, "sysroot", &sysroot_src.to_path(dirs));
 }
 
 pub(crate) struct GitRepo {
@@ -92,13 +95,19 @@ impl GitRepo {
         }
     }
 
-    fn fetch(&self) {
+    fn fetch(&self, dirs: &Dirs) {
         match self.url {
             GitRepoUrl::Github { user, repo } => {
-                clone_repo_shallow_github(&self.source_dir().to_path(), user, repo, self.rev);
+                clone_repo_shallow_github(
+                    dirs,
+                    &self.source_dir().to_path(dirs),
+                    user,
+                    repo,
+                    self.rev,
+                );
             }
         }
-        apply_patches(self.patch_name, &self.source_dir().to_path());
+        apply_patches(dirs, self.patch_name, &self.source_dir().to_path(dirs));
     }
 }
 
@@ -117,7 +126,7 @@ fn clone_repo(download_dir: &Path, repo: &str, rev: &str) {
     spawn_and_wait(checkout_cmd);
 }
 
-fn clone_repo_shallow_github(download_dir: &Path, user: &str, repo: &str, rev: &str) {
+fn clone_repo_shallow_github(dirs: &Dirs, download_dir: &Path, user: &str, repo: &str, rev: &str) {
     if cfg!(windows) {
         // Older windows doesn't have tar or curl by default. Fall back to using git.
         clone_repo(download_dir, &format!("https://github.com/{}/{}.git", user, repo), rev);
@@ -125,8 +134,8 @@ fn clone_repo_shallow_github(download_dir: &Path, user: &str, repo: &str, rev: &
     }
 
     let archive_url = format!("https://github.com/{}/{}/archive/{}.tar.gz", user, repo, rev);
-    let archive_file = RelPath::DOWNLOAD.to_path().join(format!("{}.tar.gz", rev));
-    let archive_dir = RelPath::DOWNLOAD.to_path().join(format!("{}-{}", repo, rev));
+    let archive_file = RelPath::DOWNLOAD.to_path(dirs).join(format!("{}.tar.gz", rev));
+    let archive_dir = RelPath::DOWNLOAD.to_path(dirs).join(format!("{}-{}", repo, rev));
 
     eprintln!("[DOWNLOAD] {}/{} from {}", user, repo, archive_url);
 
@@ -142,7 +151,7 @@ fn clone_repo_shallow_github(download_dir: &Path, user: &str, repo: &str, rev: &
 
     // Unpack tar archive
     let mut unpack_cmd = Command::new("tar");
-    unpack_cmd.arg("xf").arg(&archive_file).current_dir(RelPath::DOWNLOAD.to_path());
+    unpack_cmd.arg("xf").arg(&archive_file).current_dir(RelPath::DOWNLOAD.to_path(dirs));
     spawn_and_wait(unpack_cmd);
 
     // Rename unpacked dir to the expected name
@@ -168,8 +177,8 @@ fn init_git_repo(repo_dir: &Path) {
     spawn_and_wait(git_commit_cmd);
 }
 
-fn get_patches(crate_name: &str) -> Vec<PathBuf> {
-    let mut patches: Vec<_> = fs::read_dir(RelPath::PATCHES.to_path())
+fn get_patches(dirs: &Dirs, crate_name: &str) -> Vec<PathBuf> {
+    let mut patches: Vec<_> = fs::read_dir(RelPath::PATCHES.to_path(dirs))
         .unwrap()
         .map(|entry| entry.unwrap().path())
         .filter(|path| path.extension() == Some(OsStr::new("patch")))
@@ -188,12 +197,12 @@ fn get_patches(crate_name: &str) -> Vec<PathBuf> {
     patches
 }
 
-fn apply_patches(crate_name: &str, target_dir: &Path) {
+fn apply_patches(dirs: &Dirs, crate_name: &str, target_dir: &Path) {
     if crate_name == "<none>" {
         return;
     }
 
-    for patch in get_patches(crate_name) {
+    for patch in get_patches(dirs, crate_name) {
         eprintln!(
             "[PATCH] {:?} <- {:?}",
             target_dir.file_name().unwrap(),
diff --git a/build_system/tests.rs b/build_system/tests.rs
index 3e495617fb2..bd31d5e6bbf 100644
--- a/build_system/tests.rs
+++ b/build_system/tests.rs
@@ -1,6 +1,6 @@
 use super::build_sysroot;
 use super::config;
-use super::path::RelPath;
+use super::path::{Dirs, RelPath};
 use super::prepare::GitRepo;
 use super::rustc_info::{get_cargo_path, get_wrapper_file_name};
 use super::utils::{
@@ -256,16 +256,16 @@ static LIBCORE_TESTS: CargoProject =
 
 const EXTENDED_SYSROOT_SUITE: &[TestCase] = &[
     TestCase::new("test.rust-random/rand", &|runner| {
-        spawn_and_wait(RAND.clean(&runner.target_compiler.cargo));
+        spawn_and_wait(RAND.clean(&runner.target_compiler.cargo, &runner.dirs));
 
         if runner.is_native {
             eprintln!("[TEST] rust-random/rand");
-            let mut test_cmd = RAND.test(&runner.target_compiler);
+            let mut test_cmd = RAND.test(&runner.target_compiler, &runner.dirs);
             test_cmd.arg("--workspace");
             spawn_and_wait(test_cmd);
         } else {
             eprintln!("[AOT] rust-random/rand");
-            let mut build_cmd = RAND.build(&runner.target_compiler);
+            let mut build_cmd = RAND.build(&runner.target_compiler, &runner.dirs);
             build_cmd.arg("--workspace").arg("--tests");
             spawn_and_wait(build_cmd);
         }
@@ -275,10 +275,11 @@ const EXTENDED_SYSROOT_SUITE: &[TestCase] = &[
 
         if runner.is_native {
             eprintln!("[BENCH COMPILE] ebobby/simple-raytracer");
-            let cargo_clif =
-                RelPath::DIST.to_path().join(get_wrapper_file_name("cargo-clif", "bin"));
-            let manifest_path = SIMPLE_RAYTRACER.manifest_path();
-            let target_dir = SIMPLE_RAYTRACER.target_dir();
+            let cargo_clif = RelPath::DIST
+                .to_path(&runner.dirs)
+                .join(get_wrapper_file_name("cargo-clif", "bin"));
+            let manifest_path = SIMPLE_RAYTRACER.manifest_path(&runner.dirs);
+            let target_dir = SIMPLE_RAYTRACER.target_dir(&runner.dirs);
 
             let clean_cmd = format!(
                 "cargo clean --manifest-path {manifest_path} --target-dir {target_dir}",
@@ -305,54 +306,56 @@ const EXTENDED_SYSROOT_SUITE: &[TestCase] = &[
             eprintln!("[BENCH RUN] ebobby/simple-raytracer");
             fs::copy(
                 target_dir.join("debug").join("main"),
-                RelPath::BUILD.to_path().join("raytracer_cg_clif"),
+                RelPath::BUILD.to_path(&runner.dirs).join("raytracer_cg_clif"),
             )
             .unwrap();
 
             let mut bench_run =
                 hyperfine_command(0, run_runs, None, "./raytracer_cg_llvm", "./raytracer_cg_clif");
-            bench_run.current_dir(RelPath::BUILD.to_path());
+            bench_run.current_dir(RelPath::BUILD.to_path(&runner.dirs));
             spawn_and_wait(bench_run);
         } else {
-            spawn_and_wait(SIMPLE_RAYTRACER.clean(&runner.target_compiler.cargo));
+            spawn_and_wait(SIMPLE_RAYTRACER.clean(&runner.target_compiler.cargo, &runner.dirs));
             eprintln!("[BENCH COMPILE] ebobby/simple-raytracer (skipped)");
             eprintln!("[COMPILE] ebobby/simple-raytracer");
-            spawn_and_wait(SIMPLE_RAYTRACER.build(&runner.target_compiler));
+            spawn_and_wait(SIMPLE_RAYTRACER.build(&runner.target_compiler, &runner.dirs));
             eprintln!("[BENCH RUN] ebobby/simple-raytracer (skipped)");
         }
     }),
     TestCase::new("test.libcore", &|runner| {
-        spawn_and_wait(LIBCORE_TESTS.clean(&runner.host_compiler.cargo));
+        spawn_and_wait(LIBCORE_TESTS.clean(&runner.host_compiler.cargo, &runner.dirs));
 
         if runner.is_native {
-            spawn_and_wait(LIBCORE_TESTS.test(&runner.target_compiler));
+            spawn_and_wait(LIBCORE_TESTS.test(&runner.target_compiler, &runner.dirs));
         } else {
             eprintln!("Cross-Compiling: Not running tests");
-            let mut build_cmd = LIBCORE_TESTS.build(&runner.target_compiler);
+            let mut build_cmd = LIBCORE_TESTS.build(&runner.target_compiler, &runner.dirs);
             build_cmd.arg("--tests");
             spawn_and_wait(build_cmd);
         }
     }),
     TestCase::new("test.regex-shootout-regex-dna", &|runner| {
-        spawn_and_wait(REGEX.clean(&runner.target_compiler.cargo));
+        spawn_and_wait(REGEX.clean(&runner.target_compiler.cargo, &runner.dirs));
 
         // newer aho_corasick versions throw a deprecation warning
         let lint_rust_flags = format!("{} --cap-lints warn", runner.target_compiler.rustflags);
 
-        let mut build_cmd = REGEX.build(&runner.target_compiler);
+        let mut build_cmd = REGEX.build(&runner.target_compiler, &runner.dirs);
         build_cmd.arg("--example").arg("shootout-regex-dna");
         build_cmd.env("RUSTFLAGS", lint_rust_flags.clone());
         spawn_and_wait(build_cmd);
 
         if runner.is_native {
-            let mut run_cmd = REGEX.run(&runner.target_compiler);
+            let mut run_cmd = REGEX.run(&runner.target_compiler, &runner.dirs);
             run_cmd.arg("--example").arg("shootout-regex-dna");
             run_cmd.env("RUSTFLAGS", lint_rust_flags);
 
-            let input =
-                fs::read_to_string(REGEX.source_dir().join("examples").join("regexdna-input.txt"))
-                    .unwrap();
-            let expected_path = REGEX.source_dir().join("examples").join("regexdna-output.txt");
+            let input = fs::read_to_string(
+                REGEX.source_dir(&runner.dirs).join("examples").join("regexdna-input.txt"),
+            )
+            .unwrap();
+            let expected_path =
+                REGEX.source_dir(&runner.dirs).join("examples").join("regexdna-output.txt");
             let expected = fs::read_to_string(&expected_path).unwrap();
 
             let output = spawn_and_wait_with_input(run_cmd, input);
@@ -366,7 +369,7 @@ const EXTENDED_SYSROOT_SUITE: &[TestCase] = &[
 
             let output_matches = expected.lines().eq(output.lines());
             if !output_matches {
-                let res_path = REGEX.source_dir().join("res.txt");
+                let res_path = REGEX.source_dir(&runner.dirs).join("res.txt");
                 fs::write(&res_path, &output).unwrap();
 
                 if cfg!(windows) {
@@ -386,13 +389,13 @@ const EXTENDED_SYSROOT_SUITE: &[TestCase] = &[
         }
     }),
     TestCase::new("test.regex", &|runner| {
-        spawn_and_wait(REGEX.clean(&runner.host_compiler.cargo));
+        spawn_and_wait(REGEX.clean(&runner.host_compiler.cargo, &runner.dirs));
 
         // newer aho_corasick versions throw a deprecation warning
         let lint_rust_flags = format!("{} --cap-lints warn", runner.target_compiler.rustflags);
 
         if runner.is_native {
-            let mut run_cmd = REGEX.test(&runner.target_compiler);
+            let mut run_cmd = REGEX.test(&runner.target_compiler, &runner.dirs);
             run_cmd.args([
                 "--tests",
                 "--",
@@ -406,21 +409,21 @@ const EXTENDED_SYSROOT_SUITE: &[TestCase] = &[
             spawn_and_wait(run_cmd);
         } else {
             eprintln!("Cross-Compiling: Not running tests");
-            let mut build_cmd = REGEX.build(&runner.target_compiler);
+            let mut build_cmd = REGEX.build(&runner.target_compiler, &runner.dirs);
             build_cmd.arg("--tests");
             build_cmd.env("RUSTFLAGS", lint_rust_flags.clone());
             spawn_and_wait(build_cmd);
         }
     }),
     TestCase::new("test.portable-simd", &|runner| {
-        spawn_and_wait(PORTABLE_SIMD.clean(&runner.host_compiler.cargo));
+        spawn_and_wait(PORTABLE_SIMD.clean(&runner.host_compiler.cargo, &runner.dirs));
 
-        let mut build_cmd = PORTABLE_SIMD.build(&runner.target_compiler);
+        let mut build_cmd = PORTABLE_SIMD.build(&runner.target_compiler, &runner.dirs);
         build_cmd.arg("--all-targets");
         spawn_and_wait(build_cmd);
 
         if runner.is_native {
-            let mut test_cmd = PORTABLE_SIMD.test(&runner.target_compiler);
+            let mut test_cmd = PORTABLE_SIMD.test(&runner.target_compiler, &runner.dirs);
             test_cmd.arg("-q");
             spawn_and_wait(test_cmd);
         }
@@ -428,16 +431,18 @@ const EXTENDED_SYSROOT_SUITE: &[TestCase] = &[
 ];
 
 pub(crate) fn run_tests(
+    dirs: &Dirs,
     channel: &str,
     sysroot_kind: SysrootKind,
     cg_clif_dylib: &Path,
     host_triple: &str,
     target_triple: &str,
 ) {
-    let runner = TestRunner::new(host_triple.to_string(), target_triple.to_string());
+    let runner = TestRunner::new(dirs.clone(), host_triple.to_string(), target_triple.to_string());
 
     if config::get_bool("testsuite.no_sysroot") {
         build_sysroot::build_sysroot(
+            dirs,
             channel,
             SysrootKind::None,
             cg_clif_dylib,
@@ -445,7 +450,7 @@ pub(crate) fn run_tests(
             &target_triple,
         );
 
-        BUILD_EXAMPLE_OUT_DIR.ensure_fresh();
+        BUILD_EXAMPLE_OUT_DIR.ensure_fresh(dirs);
         runner.run_testsuite(NO_SYSROOT_SUITE);
     } else {
         eprintln!("[SKIP] no_sysroot tests");
@@ -456,6 +461,7 @@ pub(crate) fn run_tests(
 
     if run_base_sysroot || run_extended_sysroot {
         build_sysroot::build_sysroot(
+            dirs,
             channel,
             sysroot_kind,
             cg_clif_dylib,
@@ -480,19 +486,21 @@ pub(crate) fn run_tests(
 struct TestRunner {
     is_native: bool,
     jit_supported: bool,
+    dirs: Dirs,
     host_compiler: Compiler,
     target_compiler: Compiler,
 }
 
 impl TestRunner {
-    pub fn new(host_triple: String, target_triple: String) -> Self {
+    pub fn new(dirs: Dirs, host_triple: String, target_triple: String) -> Self {
         let is_native = host_triple == target_triple;
         let jit_supported =
             target_triple.contains("x86_64") && is_native && !host_triple.contains("windows");
 
-        let rustc_clif = RelPath::DIST.to_path().join(get_wrapper_file_name("rustc-clif", "bin"));
+        let rustc_clif =
+            RelPath::DIST.to_path(&dirs).join(get_wrapper_file_name("rustc-clif", "bin"));
         let rustdoc_clif =
-            RelPath::DIST.to_path().join(get_wrapper_file_name("rustdoc-clif", "bin"));
+            RelPath::DIST.to_path(&dirs).join(get_wrapper_file_name("rustdoc-clif", "bin"));
 
         let mut rustflags = env::var("RUSTFLAGS").ok().unwrap_or("".to_string());
         let mut runner = vec![];
@@ -543,7 +551,7 @@ impl TestRunner {
             runner,
         };
 
-        Self { is_native, jit_supported, host_compiler, target_compiler }
+        Self { is_native, jit_supported, dirs, host_compiler, target_compiler }
     }
 
     pub fn run_testsuite(&self, tests: &[TestCase]) {
@@ -572,9 +580,9 @@ impl TestRunner {
         let mut cmd = Command::new(&self.target_compiler.rustc);
         cmd.args(self.target_compiler.rustflags.split_whitespace());
         cmd.arg("-L");
-        cmd.arg(format!("crate={}", BUILD_EXAMPLE_OUT_DIR.to_path().display()));
+        cmd.arg(format!("crate={}", BUILD_EXAMPLE_OUT_DIR.to_path(&self.dirs).display()));
         cmd.arg("--out-dir");
-        cmd.arg(format!("{}", BUILD_EXAMPLE_OUT_DIR.to_path().display()));
+        cmd.arg(format!("{}", BUILD_EXAMPLE_OUT_DIR.to_path(&self.dirs).display()));
         cmd.arg("-Cdebuginfo=2");
         cmd.args(args);
         cmd
@@ -599,7 +607,9 @@ impl TestRunner {
             full_cmd.extend(self.target_compiler.runner.iter().cloned());
         }
 
-        full_cmd.push(BUILD_EXAMPLE_OUT_DIR.to_path().join(name).to_str().unwrap().to_string());
+        full_cmd.push(
+            BUILD_EXAMPLE_OUT_DIR.to_path(&self.dirs).join(name).to_str().unwrap().to_string(),
+        );
 
         for arg in args.into_iter() {
             full_cmd.push(arg.to_string());
diff --git a/build_system/utils.rs b/build_system/utils.rs
index 422492df007..dab6308bc1d 100644
--- a/build_system/utils.rs
+++ b/build_system/utils.rs
@@ -4,7 +4,7 @@ use std::io::Write;
 use std::path::{Path, PathBuf};
 use std::process::{self, Command, Stdio};
 
-use super::path::RelPath;
+use super::path::{Dirs, RelPath};
 use super::rustc_info::{get_cargo_path, get_host_triple, get_rustc_path, get_rustdoc_path};
 
 pub(crate) struct Compiler {
@@ -53,32 +53,32 @@ impl CargoProject {
         CargoProject { source: path, target }
     }
 
-    pub(crate) fn source_dir(&self) -> PathBuf {
-        self.source.to_path()
+    pub(crate) fn source_dir(&self, dirs: &Dirs) -> PathBuf {
+        self.source.to_path(dirs)
     }
 
-    pub(crate) fn manifest_path(&self) -> PathBuf {
-        self.source_dir().join("Cargo.toml")
+    pub(crate) fn manifest_path(&self, dirs: &Dirs) -> PathBuf {
+        self.source_dir(dirs).join("Cargo.toml")
     }
 
-    pub(crate) fn target_dir(&self) -> PathBuf {
-        RelPath::BUILD.join(self.target).to_path()
+    pub(crate) fn target_dir(&self, dirs: &Dirs) -> PathBuf {
+        RelPath::BUILD.join(self.target).to_path(dirs)
     }
 
-    fn base_cmd(&self, command: &str, cargo: &Path) -> Command {
+    fn base_cmd(&self, command: &str, cargo: &Path, dirs: &Dirs) -> Command {
         let mut cmd = Command::new(cargo);
 
         cmd.arg(command)
             .arg("--manifest-path")
-            .arg(self.manifest_path())
+            .arg(self.manifest_path(dirs))
             .arg("--target-dir")
-            .arg(self.target_dir());
+            .arg(self.target_dir(dirs));
 
         cmd
     }
 
-    fn build_cmd(&self, command: &str, compiler: &Compiler) -> Command {
-        let mut cmd = self.base_cmd(command, &compiler.cargo);
+    fn build_cmd(&self, command: &str, compiler: &Compiler, dirs: &Dirs) -> Command {
+        let mut cmd = self.base_cmd(command, &compiler.cargo, dirs);
 
         cmd.arg("--target").arg(&compiler.triple);
 
@@ -97,32 +97,32 @@ impl CargoProject {
     }
 
     #[must_use]
-    pub(crate) fn fetch(&self, cargo: impl AsRef<Path>) -> Command {
+    pub(crate) fn fetch(&self, cargo: impl AsRef<Path>, dirs: &Dirs) -> Command {
         let mut cmd = Command::new(cargo.as_ref());
 
-        cmd.arg("fetch").arg("--manifest-path").arg(self.manifest_path());
+        cmd.arg("fetch").arg("--manifest-path").arg(self.manifest_path(dirs));
 
         cmd
     }
 
     #[must_use]
-    pub(crate) fn clean(&self, cargo: &Path) -> Command {
-        self.base_cmd("clean", cargo)
+    pub(crate) fn clean(&self, cargo: &Path, dirs: &Dirs) -> Command {
+        self.base_cmd("clean", cargo, dirs)
     }
 
     #[must_use]
-    pub(crate) fn build(&self, compiler: &Compiler) -> Command {
-        self.build_cmd("build", compiler)
+    pub(crate) fn build(&self, compiler: &Compiler, dirs: &Dirs) -> Command {
+        self.build_cmd("build", compiler, dirs)
     }
 
     #[must_use]
-    pub(crate) fn test(&self, compiler: &Compiler) -> Command {
-        self.build_cmd("test", compiler)
+    pub(crate) fn test(&self, compiler: &Compiler, dirs: &Dirs) -> Command {
+        self.build_cmd("test", compiler, dirs)
     }
 
     #[must_use]
-    pub(crate) fn run(&self, compiler: &Compiler) -> Command {
-        self.build_cmd("run", compiler)
+    pub(crate) fn run(&self, compiler: &Compiler, dirs: &Dirs) -> Command {
+        self.build_cmd("run", compiler, dirs)
     }
 }