Merge pull request #1357 from bjorn3/build_system_rework6

Support testing of cg_clif in rust's CI
author: bjorn3 <17426603+bjorn3@users.noreply.github.com> 2023-06-15 19:37:23 +0200
committer: GitHub <noreply@github.com> 2023-06-15 19:37:23 +0200
commit: f2895f314342814ff4ee87b73cf4b3eefcf13868 (patch)
tree: 5bc67aff79b182c57f006bdbe45e132e87f1ff2e
parent: 45781e107c37524386478b02082700f09bd10d78 (diff)
parent: e9bd63af3cfc192f0f998debbf5ab3e597781cec (diff)
download: rust-f2895f314342814ff4ee87b73cf4b3eefcf13868.tar.gz
rust-f2895f314342814ff4ee87b73cf4b3eefcf13868.zip
35 files changed, 1602 insertions, 258 deletions
diff --git a/.cirrus.yml b/.cirrus.yml
index 1405ea74903..8b4efd4e394 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -10,7 +10,7 @@ task:
     folder: target
   prepare_script:
     - . $HOME/.cargo/env
-    - ./y.rs prepare
+    - ./y.sh prepare
   test_script:
     - . $HOME/.cargo/env
-    - ./y.rs test
+    - ./y.sh test
diff --git a/.github/workflows/abi-cafe.yml b/.github/workflows/abi-cafe.yml
index 3c40555669c..12aa69d3c79 100644
--- a/.github/workflows/abi-cafe.yml
+++ b/.github/workflows/abi-cafe.yml
@@ -46,12 +46,12 @@ jobs:
       run: rustup set default-host x86_64-pc-windows-gnu
 
     - name: Prepare dependencies
-      run: ./y.rs prepare
+      run: ./y.sh prepare
 
     - name: Build
-      run: ./y.rs build --sysroot none
+      run: ./y.sh build --sysroot none
 
     - name: Test abi-cafe
       env:
         TARGET_TRIPLE: ${{ matrix.env.TARGET_TRIPLE }}
-      run: ./y.rs abi-cafe
+      run: ./y.sh abi-cafe
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index abcd1affdee..8e6c1e8ade0 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -19,7 +19,7 @@ jobs:
     - name: Rustfmt
       run: |
         cargo fmt --check
-        rustfmt --check build_system/mod.rs
+        rustfmt --check build_system/main.rs
         rustfmt --check example/*
 
 
@@ -91,15 +91,15 @@ jobs:
         sudo apt-get install -y gcc-s390x-linux-gnu qemu-user
 
     - name: Prepare dependencies
-      run: ./y.rs prepare
+      run: ./y.sh prepare
 
     - name: Build
-      run: ./y.rs build --sysroot none
+      run: ./y.sh build --sysroot none
 
     - name: Test
       env:
         TARGET_TRIPLE: ${{ matrix.env.TARGET_TRIPLE }}
-      run: ./y.rs test
+      run: ./y.sh test
 
     - name: Install LLVM standard library
       run: rustup target add ${{ matrix.env.TARGET_TRIPLE }}
@@ -111,7 +111,7 @@ jobs:
       if: matrix.os != 'windows-latest' || matrix.env.TARGET_TRIPLE != 'x86_64-pc-windows-gnu'
       env:
         TARGET_TRIPLE: ${{ matrix.env.TARGET_TRIPLE }}
-      run: ./y.rs test --sysroot llvm --no-unstable-features
+      run: ./y.sh test --sysroot llvm --no-unstable-features
 
 
   # This job doesn't use cg_clif in any way. It checks that all cg_clif tests work with cg_llvm too.
@@ -165,13 +165,13 @@ jobs:
       run: cargo install hyperfine || true
 
     - name: Prepare dependencies
-      run: ./y.rs prepare
+      run: ./y.sh prepare
 
     - name: Build
-      run: CI_OPT=1 ./y.rs build --sysroot none
+      run: CI_OPT=1 ./y.sh build --sysroot none
 
     - name: Benchmark
-      run: CI_OPT=1 ./y.rs bench
+      run: CI_OPT=1 ./y.sh bench
 
 
   dist:
@@ -224,13 +224,13 @@ jobs:
         sudo apt-get install -y gcc-mingw-w64-x86-64 wine-stable
 
     - name: Prepare dependencies
-      run: ./y.rs prepare
+      run: ./y.sh prepare
 
     - name: Build backend
-      run: CI_OPT=1 ./y.rs build --sysroot none
+      run: CI_OPT=1 ./y.sh build --sysroot none
 
     - name: Build sysroot
-      run: CI_OPT=1 ./y.rs build
+      run: CI_OPT=1 ./y.sh build
 
     - name: Package prebuilt cg_clif
       run: tar cvfJ cg_clif.tar.xz dist
diff --git a/.github/workflows/rustc.yml b/.github/workflows/rustc.yml
index b2f772c4fc4..b49dc3aff7a 100644
--- a/.github/workflows/rustc.yml
+++ b/.github/workflows/rustc.yml
@@ -18,7 +18,7 @@ jobs:
         key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('rust-toolchain', '**/Cargo.lock') }}
 
     - name: Prepare dependencies
-      run: ./y.rs prepare
+      run: ./y.sh prepare
 
     - name: Test
       run: ./scripts/test_bootstrap.sh
@@ -38,7 +38,7 @@ jobs:
         key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('rust-toolchain', '**/Cargo.lock') }}
 
     - name: Prepare dependencies
-      run: ./y.rs prepare
+      run: ./y.sh prepare
 
     - name: Test
       run: ./scripts/test_rustc_tests.sh
diff --git a/.gitignore b/.gitignore
index e5d10a937ae..e6ac8c8408d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 /target
+/build_system/target
 **/*.rs.bk
 *.rlib
 *.o
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 7c8703cba50..60cb51d5663 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -6,9 +6,10 @@
     "rust-analyzer.imports.granularity.enforce": true,
     "rust-analyzer.imports.granularity.group": "module",
     "rust-analyzer.imports.prefix": "crate",
-    "rust-analyzer.cargo.features": ["unstable-features", "__check_build_system_using_ra"],
+    "rust-analyzer.cargo.features": ["unstable-features"],
     "rust-analyzer.linkedProjects": [
         "./Cargo.toml",
+        "./build_system/Cargo.toml",
         {
             "crates": [
                 {
diff --git a/Cargo.toml b/Cargo.toml
index 145b1150423..1c1f2d8577b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,13 +3,6 @@ name = "rustc_codegen_cranelift"
 version = "0.1.0"
 edition = "2021"
 
-[[bin]]
-# This is used just to teach rust-analyzer how to check the build system. required-features is used
-# to disable it for regular builds.
-name = "y"
-path = "./y.rs"
-required-features = ["__check_build_system_using_ra"]
-
 [lib]
 crate-type = ["dylib"]
 
@@ -45,7 +38,6 @@ smallvec = "1.8.1"
 unstable-features = ["jit", "inline_asm"]
 jit = ["cranelift-jit", "libloading"]
 inline_asm = []
-__check_build_system_using_ra = []
 
 [package.metadata.rust-analyzer]
 rustc_private = true
diff --git a/Readme.md b/Readme.md
index 7e9945578a5..9469feea0cb 100644
--- a/Readme.md
+++ b/Readme.md
@@ -10,8 +10,8 @@ If not please open an issue.
 ```bash
 $ git clone https://github.com/bjorn3/rustc_codegen_cranelift
 $ cd rustc_codegen_cranelift
-$ ./y.rs prepare
-$ ./y.rs build
+$ ./y.sh prepare
+$ ./y.sh build
 ```
 
 To run the test suite replace the last command with:
@@ -20,7 +20,7 @@ To run the test suite replace the last command with:
 $ ./test.sh
 ```
 
-For more docs on how to build and test see [build_system/usage.txt](build_system/usage.txt) or the help message of `./y.rs`.
+For more docs on how to build and test see [build_system/usage.txt](build_system/usage.txt) or the help message of `./y.sh`.
 
 ## Precompiled builds
 
@@ -35,7 +35,7 @@ If you want to use `cargo clif build` instead of having to specify the full path
 
 rustc_codegen_cranelift can be used as a near-drop-in replacement for `cargo build` or `cargo run` for existing projects.
 
-Assuming `$cg_clif_dir` is the directory you cloned this repo into and you followed the instructions (`y.rs prepare` and `y.rs build` or `test.sh`).
+Assuming `$cg_clif_dir` is the directory you cloned this repo into and you followed the instructions (`y.sh prepare` and `y.sh build` or `test.sh`).
 
 In the directory with your project (where you can do the usual `cargo build`), run:
 
diff --git a/build_sysroot/Cargo.toml b/build_sysroot/Cargo.toml
deleted file mode 100644
index ea9d1c8df1c..00000000000
--- a/build_sysroot/Cargo.toml
+++ /dev/null
@@ -1,36 +0,0 @@
-[package]
-name = "sysroot"
-version = "0.0.0"
-
-[dependencies]
-core = { path = "./sysroot_src/library/core" }
-alloc = { path = "./sysroot_src/library/alloc" }
-std = { path = "./sysroot_src/library/std", features = ["panic_unwind", "backtrace"] }
-test = { path = "./sysroot_src/library/test" }
-proc_macro = { path = "./sysroot_src/library/proc_macro" }
-
-compiler_builtins = { version = "0.1.87", default-features = false, features = ["no-asm"] }
-
-[patch.crates-io]
-rustc-std-workspace-core = { path = "./sysroot_src/library/rustc-std-workspace-core" }
-rustc-std-workspace-alloc = { path = "./sysroot_src/library/rustc-std-workspace-alloc" }
-rustc-std-workspace-std = { path = "./sysroot_src/library/rustc-std-workspace-std" }
-
-[profile.dev]
-lto = "off"
-
-[profile.release]
-debug = true
-incremental = true
-lto = "off"
-
-# Mandatory for correctly compiling compiler-builtins
-[profile.dev.package.compiler_builtins]
-debug-assertions = false
-overflow-checks = false
-codegen-units = 10000
-
-[profile.release.package.compiler_builtins]
-debug-assertions = false
-overflow-checks = false
-codegen-units = 10000
diff --git a/build_sysroot/src/lib.rs b/build_sysroot/src/lib.rs
deleted file mode 100644
index 0c9ac1ac8e4..00000000000
--- a/build_sysroot/src/lib.rs
+++ /dev/null
@@ -1 +0,0 @@
-#![no_std]
diff --git a/build_system/Cargo.lock b/build_system/Cargo.lock
new file mode 100644
index 00000000000..86268e19160
--- /dev/null
+++ b/build_system/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "y"
+version = "0.1.0"
diff --git a/build_system/Cargo.toml b/build_system/Cargo.toml
new file mode 100644
index 00000000000..f47b9bc5540
--- /dev/null
+++ b/build_system/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "y"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "y"
+path = "main.rs"
+
+[features]
+unstable-features = [] # for rust-analyzer
+
+# Do not add any dependencies
diff --git a/build_system/abi_cafe.rs b/build_system/abi_cafe.rs
index 9634430d116..29c127bf50e 100644
--- a/build_system/abi_cafe.rs
+++ b/build_system/abi_cafe.rs
@@ -4,10 +4,15 @@ use super::prepare::GitRepo;
 use super::utils::{spawn_and_wait, CargoProject, Compiler};
 use super::{CodegenBackend, SysrootKind};
 
-static ABI_CAFE_REPO: GitRepo =
-    GitRepo::github("Gankra", "abi-cafe", "4c6dc8c9c687e2b3a760ff2176ce236872b37212", "abi-cafe");
+static ABI_CAFE_REPO: GitRepo = GitRepo::github(
+    "Gankra",
+    "abi-cafe",
+    "4c6dc8c9c687e2b3a760ff2176ce236872b37212",
+    "588df6d66abbe105",
+    "abi-cafe",
+);
 
-static ABI_CAFE: CargoProject = CargoProject::new(&ABI_CAFE_REPO.source_dir(), "abi_cafe");
+static ABI_CAFE: CargoProject = CargoProject::new(&ABI_CAFE_REPO.source_dir(), "abi_cafe_target");
 
 pub(crate) fn run(
     channel: &str,
@@ -18,6 +23,7 @@ pub(crate) fn run(
     bootstrap_host_compiler: &Compiler,
 ) {
     ABI_CAFE_REPO.fetch(dirs);
+    ABI_CAFE_REPO.patch(dirs);
 
     eprintln!("Building sysroot for abi-cafe");
     build_sysroot::build_sysroot(
diff --git a/build_system/bench.rs b/build_system/bench.rs
index d24803eb7c6..2bb11800034 100644
--- a/build_system/bench.rs
+++ b/build_system/bench.rs
@@ -10,6 +10,7 @@ static SIMPLE_RAYTRACER_REPO: GitRepo = GitRepo::github(
     "ebobby",
     "simple-raytracer",
     "804a7a21b9e673a482797aa289a18ed480e4d813",
+    "ad6f59a2331a3f56",
     "<none>",
 );
 
@@ -24,9 +25,8 @@ fn benchmark_simple_raytracer(dirs: &Dirs, bootstrap_host_compiler: &Compiler) {
         std::process::exit(1);
     }
 
-    if !SIMPLE_RAYTRACER_REPO.source_dir().to_path(dirs).exists() {
-        SIMPLE_RAYTRACER_REPO.fetch(dirs);
-    }
+    SIMPLE_RAYTRACER_REPO.fetch(dirs);
+    SIMPLE_RAYTRACER_REPO.patch(dirs);
 
     let bench_runs = env::var("BENCH_RUNS").unwrap_or_else(|_| "10".to_string()).parse().unwrap();
 
diff --git a/build_system/build_backend.rs b/build_system/build_backend.rs
index b88489a341c..6855c1a7fc5 100644
--- a/build_system/build_backend.rs
+++ b/build_system/build_backend.rs
@@ -3,7 +3,7 @@ use std::path::PathBuf;
 
 use super::path::{Dirs, RelPath};
 use super::rustc_info::get_file_name;
-use super::utils::{is_ci, is_ci_opt, CargoProject, Compiler};
+use super::utils::{is_ci, is_ci_opt, maybe_incremental, CargoProject, Compiler};
 
 pub(crate) static CG_CLIF: CargoProject = CargoProject::new(&RelPath::SOURCE, "cg_clif");
 
@@ -14,8 +14,7 @@ pub(crate) fn build_backend(
     use_unstable_features: bool,
 ) -> PathBuf {
     let mut cmd = CG_CLIF.build(&bootstrap_host_compiler, dirs);
-
-    cmd.env("CARGO_BUILD_INCREMENTAL", "true"); // Force incr comp even in release mode
+    maybe_incremental(&mut cmd);
 
     let mut rustflags = env::var("RUSTFLAGS").unwrap_or_default();
 
@@ -23,9 +22,6 @@ pub(crate) fn build_backend(
         // Deny warnings on CI
         rustflags += " -Dwarnings";
 
-        // Disabling incr comp reduces cache size and incr comp doesn't save as much on CI anyway
-        cmd.env("CARGO_BUILD_INCREMENTAL", "false");
-
         if !is_ci_opt() {
             cmd.env("CARGO_PROFILE_RELEASE_DEBUG_ASSERTIONS", "true");
             cmd.env("CARGO_PROFILE_RELEASE_OVERFLOW_CHECKS", "true");
diff --git a/build_system/build_sysroot.rs b/build_system/build_sysroot.rs
index dab9c77d1a4..74bba9ed5eb 100644
--- a/build_system/build_sysroot.rs
+++ b/build_system/build_sysroot.rs
@@ -1,10 +1,12 @@
 use std::fs;
 use std::path::{Path, PathBuf};
-use std::process::{self, Command};
+use std::process::Command;
 
 use super::path::{Dirs, RelPath};
-use super::rustc_info::{get_file_name, get_rustc_version};
-use super::utils::{remove_dir_if_exists, spawn_and_wait, try_hard_link, CargoProject, Compiler};
+use super::rustc_info::get_file_name;
+use super::utils::{
+    maybe_incremental, remove_dir_if_exists, spawn_and_wait, try_hard_link, CargoProject, Compiler,
+};
 use super::{CodegenBackend, SysrootKind};
 
 static DIST_DIR: RelPath = RelPath::DIST;
@@ -155,12 +157,9 @@ impl SysrootTarget {
     }
 }
 
-pub(crate) static ORIG_BUILD_SYSROOT: RelPath = RelPath::SOURCE.join("build_sysroot");
-pub(crate) static BUILD_SYSROOT: RelPath = RelPath::DOWNLOAD.join("sysroot");
-pub(crate) static SYSROOT_RUSTC_VERSION: RelPath = BUILD_SYSROOT.join("rustc_version");
-pub(crate) static SYSROOT_SRC: RelPath = BUILD_SYSROOT.join("sysroot_src");
+pub(crate) static STDLIB_SRC: RelPath = RelPath::BUILD.join("stdlib");
 pub(crate) static STANDARD_LIBRARY: CargoProject =
-    CargoProject::new(&BUILD_SYSROOT, "build_sysroot");
+    CargoProject::new(&STDLIB_SRC.join("library/sysroot"), "stdlib_target");
 pub(crate) static RTSTARTUP_SYSROOT: RelPath = RelPath::BUILD.join("rtstartup");
 
 #[must_use]
@@ -222,24 +221,6 @@ fn build_clif_sysroot_for_triple(
     mut compiler: Compiler,
     cg_clif_dylib_path: &CodegenBackend,
 ) -> SysrootTarget {
-    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");
-            process::exit(1);
-        }
-        Ok(source_version) => {
-            let rustc_version = get_rustc_version(&compiler.rustc);
-            if source_version != rustc_version {
-                eprintln!("The patched sysroot source is outdated");
-                eprintln!("Source version: {}", source_version.trim());
-                eprintln!("Rustc version:  {}", rustc_version.trim());
-                eprintln!("Hint: Try `./y.rs prepare` to update the patched sysroot source");
-                process::exit(1);
-            }
-        }
-    }
-
     let mut target_libs = SysrootTarget { triple: compiler.triple.clone(), libs: vec![] };
 
     if let Some(rtstartup_target_libs) = build_rtstartup(dirs, &compiler) {
@@ -274,10 +255,12 @@ fn build_clif_sysroot_for_triple(
     }
     compiler.rustflags += &rustflags;
     let mut build_cmd = STANDARD_LIBRARY.build(&compiler, dirs);
+    maybe_incremental(&mut build_cmd);
     if channel == "release" {
         build_cmd.arg("--release");
     }
-    build_cmd.arg("--locked");
+    build_cmd.arg("--features").arg("compiler-builtins-no-asm backtrace panic-unwind");
+    build_cmd.env("CARGO_PROFILE_RELEASE_DEBUG", "true");
     build_cmd.env("__CARGO_DEFAULT_LIB_METADATA", "cg_clif");
     if compiler.triple.contains("apple") {
         build_cmd.env("CARGO_PROFILE_RELEASE_SPLIT_DEBUGINFO", "packed");
@@ -300,13 +283,17 @@ fn build_clif_sysroot_for_triple(
 }
 
 fn build_rtstartup(dirs: &Dirs, compiler: &Compiler) -> Option<SysrootTarget> {
+    if !super::config::get_bool("keep_sysroot") {
+        super::prepare::prepare_stdlib(dirs, &compiler.rustc);
+    }
+
     if !compiler.triple.ends_with("windows-gnu") {
         return None;
     }
 
     RTSTARTUP_SYSROOT.ensure_fresh(dirs);
 
-    let rtstartup_src = SYSROOT_SRC.to_path(dirs).join("library").join("rtstartup");
+    let rtstartup_src = STDLIB_SRC.to_path(dirs).join("library").join("rtstartup");
     let mut target_libs = SysrootTarget { triple: compiler.triple.clone(), libs: vec![] };
 
     for file in ["rsbegin", "rsend"] {
diff --git a/build_system/mod.rs b/build_system/main.rs
index 0110011169d..3bc78d5db94 100644
--- a/build_system/mod.rs
+++ b/build_system/main.rs
@@ -1,3 +1,7 @@
+#![warn(rust_2018_idioms)]
+#![warn(unused_lifetimes)]
+#![warn(unreachable_pub)]
+
 use std::env;
 use std::path::PathBuf;
 use std::process;
@@ -37,19 +41,19 @@ enum Command {
 }
 
 #[derive(Copy, Clone, Debug)]
-pub(crate) enum SysrootKind {
+enum SysrootKind {
     None,
     Clif,
     Llvm,
 }
 
 #[derive(Clone, Debug)]
-pub(crate) enum CodegenBackend {
+enum CodegenBackend {
     Local(PathBuf),
     Builtin(String),
 }
 
-pub(crate) fn main() {
+fn main() {
     if env::var("RUST_BACKTRACE").is_err() {
         env::set_var("RUST_BACKTRACE", "1");
     }
@@ -81,17 +85,24 @@ pub(crate) fn main() {
     };
 
     let mut out_dir = PathBuf::from(".");
+    let mut download_dir = None;
     let mut channel = "release";
     let mut sysroot_kind = SysrootKind::Clif;
     let mut use_unstable_features = true;
     let mut frozen = false;
+    let mut skip_tests = vec![];
     let mut use_backend = None;
     while let Some(arg) = args.next().as_deref() {
         match arg {
             "--out-dir" => {
                 out_dir = PathBuf::from(args.next().unwrap_or_else(|| {
                     arg_error!("--out-dir requires argument");
-                }))
+                }));
+            }
+            "--download-dir" => {
+                download_dir = Some(PathBuf::from(args.next().unwrap_or_else(|| {
+                    arg_error!("--download-dir requires argument");
+                })));
             }
             "--debug" => channel = "debug",
             "--sysroot" => {
@@ -105,6 +116,12 @@ pub(crate) fn main() {
             }
             "--no-unstable-features" => use_unstable_features = false,
             "--frozen" => frozen = true,
+            "--skip-test" => {
+                // FIXME check that all passed in tests actually exist
+                skip_tests.push(args.next().unwrap_or_else(|| {
+                    arg_error!("--skip-test requires argument");
+                }));
+            }
             "--use-backend" => {
                 use_backend = Some(match args.next() {
                     Some(name) => name,
@@ -116,6 +133,22 @@ pub(crate) fn main() {
         }
     }
 
+    let current_dir = std::env::current_dir().unwrap();
+    out_dir = current_dir.join(out_dir);
+
+    if command == Command::Prepare {
+        prepare::prepare(&path::Dirs {
+            source_dir: current_dir.clone(),
+            download_dir: download_dir
+                .map(|dir| current_dir.join(dir))
+                .unwrap_or_else(|| out_dir.join("download")),
+            build_dir: PathBuf::from("dummy_do_not_use"),
+            dist_dir: PathBuf::from("dummy_do_not_use"),
+            frozen,
+        });
+        process::exit(0);
+    }
+
     let rustup_toolchain_name = match (env::var("CARGO"), env::var("RUSTC"), env::var("RUSTDOC")) {
         (Ok(_), Ok(_), Ok(_)) => None,
         (Err(_), Err(_), Err(_)) => Some(rustc_info::get_toolchain_name()),
@@ -147,12 +180,11 @@ pub(crate) fn main() {
         .or_else(|| config::get_value("target"))
         .unwrap_or_else(|| bootstrap_host_compiler.triple.clone());
 
-    // FIXME allow changing the location of these dirs using cli arguments
-    let current_dir = std::env::current_dir().unwrap();
-    out_dir = current_dir.join(out_dir);
     let dirs = path::Dirs {
         source_dir: current_dir.clone(),
-        download_dir: out_dir.join("download"),
+        download_dir: download_dir
+            .map(|dir| current_dir.join(dir))
+            .unwrap_or_else(|| out_dir.join("download")),
         build_dir: out_dir.join("build"),
         dist_dir: out_dir.join("dist"),
         frozen,
@@ -169,11 +201,6 @@ pub(crate) fn main() {
         std::fs::File::create(target).unwrap();
     }
 
-    if command == Command::Prepare {
-        prepare::prepare(&dirs, &bootstrap_host_compiler.rustc);
-        process::exit(0);
-    }
-
     env::set_var("RUSTC", "rustc_should_be_set_explicitly");
     env::set_var("RUSTDOC", "rustdoc_should_be_set_explicitly");
 
@@ -197,6 +224,7 @@ pub(crate) fn main() {
                 channel,
                 sysroot_kind,
                 use_unstable_features,
+                &skip_tests.iter().map(|test| &**test).collect::<Vec<_>>(),
                 &cg_clif_dylib,
                 &bootstrap_host_compiler,
                 rustup_toolchain_name.as_deref(),
diff --git a/build_system/prepare.rs b/build_system/prepare.rs
index ac2dc47dd7f..e31e39a483f 100644
--- a/build_system/prepare.rs
+++ b/build_system/prepare.rs
@@ -3,69 +3,60 @@ use std::fs;
 use std::path::{Path, PathBuf};
 use std::process::Command;
 
-use super::build_sysroot::{BUILD_SYSROOT, ORIG_BUILD_SYSROOT, SYSROOT_RUSTC_VERSION, SYSROOT_SRC};
+use super::build_sysroot::STDLIB_SRC;
 use super::path::{Dirs, RelPath};
-use super::rustc_info::{get_default_sysroot, get_rustc_version};
-use super::tests::LIBCORE_TESTS_SRC;
-use super::utils::{copy_dir_recursively, git_command, retry_spawn_and_wait, spawn_and_wait};
-
-pub(crate) fn prepare(dirs: &Dirs, rustc: &Path) {
-    RelPath::DOWNLOAD.ensure_fresh(dirs);
-
-    prepare_stdlib(dirs, rustc);
-    prepare_coretests(dirs, rustc);
+use super::rustc_info::get_default_sysroot;
+use super::utils::{
+    copy_dir_recursively, git_command, remove_dir_if_exists, retry_spawn_and_wait, spawn_and_wait,
+};
 
+pub(crate) fn prepare(dirs: &Dirs) {
+    RelPath::DOWNLOAD.ensure_exists(dirs);
     super::tests::RAND_REPO.fetch(dirs);
     super::tests::REGEX_REPO.fetch(dirs);
     super::tests::PORTABLE_SIMD_REPO.fetch(dirs);
 }
 
-fn prepare_stdlib(dirs: &Dirs, rustc: &Path) {
-    let sysroot_src_orig = get_default_sysroot(rustc).join("lib/rustlib/src/rust");
-    assert!(sysroot_src_orig.exists());
-
-    eprintln!("[COPY] stdlib src");
-
-    // FIXME ensure builds error out or update the copy if any of the files copied here change
-    BUILD_SYSROOT.ensure_fresh(dirs);
-    copy_dir_recursively(&ORIG_BUILD_SYSROOT.to_path(dirs), &BUILD_SYSROOT.to_path(dirs));
-
-    fs::create_dir_all(SYSROOT_SRC.to_path(dirs).join("library")).unwrap();
-    copy_dir_recursively(
-        &sysroot_src_orig.join("library"),
-        &SYSROOT_SRC.to_path(dirs).join("library"),
-    );
-
-    let rustc_version = get_rustc_version(rustc);
-    fs::write(SYSROOT_RUSTC_VERSION.to_path(dirs), &rustc_version).unwrap();
-
-    eprintln!("[GIT] init");
-    init_git_repo(&SYSROOT_SRC.to_path(dirs));
-
-    apply_patches(dirs, "stdlib", &SYSROOT_SRC.to_path(dirs));
-}
-
-fn prepare_coretests(dirs: &Dirs, rustc: &Path) {
+pub(crate) fn prepare_stdlib(dirs: &Dirs, rustc: &Path) {
     let sysroot_src_orig = get_default_sysroot(rustc).join("lib/rustlib/src/rust");
     assert!(sysroot_src_orig.exists());
 
-    eprintln!("[COPY] coretests src");
-
-    fs::create_dir_all(LIBCORE_TESTS_SRC.to_path(dirs)).unwrap();
-    copy_dir_recursively(
-        &sysroot_src_orig.join("library/core/tests"),
-        &LIBCORE_TESTS_SRC.to_path(dirs),
-    );
-
-    eprintln!("[GIT] init");
-    init_git_repo(&LIBCORE_TESTS_SRC.to_path(dirs));
-
-    apply_patches(dirs, "coretests", &LIBCORE_TESTS_SRC.to_path(dirs));
+    apply_patches(dirs, "stdlib", &sysroot_src_orig, &STDLIB_SRC.to_path(dirs));
+
+    std::fs::write(
+        STDLIB_SRC.to_path(dirs).join("Cargo.toml"),
+        r#"
+[workspace]
+members = ["./library/sysroot"]
+
+[patch.crates-io]
+rustc-std-workspace-core = { path = "./library/rustc-std-workspace-core" }
+rustc-std-workspace-alloc = { path = "./library/rustc-std-workspace-alloc" }
+rustc-std-workspace-std = { path = "./library/rustc-std-workspace-std" }
+
+# Mandatory for correctly compiling compiler-builtins
+[profile.dev.package.compiler_builtins]
+debug-assertions = false
+overflow-checks = false
+codegen-units = 10000
+
+[profile.release.package.compiler_builtins]
+debug-assertions = false
+overflow-checks = false
+codegen-units = 10000
+"#,
+    )
+    .unwrap();
+
+    let source_lockfile = RelPath::PATCHES.to_path(dirs).join("stdlib-lock.toml");
+    let target_lockfile = STDLIB_SRC.to_path(dirs).join("Cargo.lock");
+    fs::copy(source_lockfile, target_lockfile).unwrap();
 }
 
 pub(crate) struct GitRepo {
     url: GitRepoUrl,
     rev: &'static str,
+    content_hash: &'static str,
     patch_name: &'static str,
 }
 
@@ -73,35 +64,107 @@ enum GitRepoUrl {
     Github { user: &'static str, repo: &'static str },
 }
 
+// Note: This uses a hasher which is not cryptographically secure. This is fine as the hash is meant
+// to protect against accidental modification and outdated downloads, not against manipulation.
+fn hash_file(file: &std::path::Path) -> u64 {
+    let contents = std::fs::read(file).unwrap();
+    #[allow(deprecated)]
+    let mut hasher = std::hash::SipHasher::new();
+    std::hash::Hash::hash(&contents, &mut hasher);
+    std::hash::Hasher::finish(&hasher)
+}
+
+fn hash_dir(dir: &std::path::Path) -> u64 {
+    let mut sub_hashes = std::collections::BTreeMap::new();
+    for entry in std::fs::read_dir(dir).unwrap() {
+        let entry = entry.unwrap();
+        if entry.file_type().unwrap().is_dir() {
+            sub_hashes
+                .insert(entry.file_name().to_str().unwrap().to_owned(), hash_dir(&entry.path()));
+        } else {
+            sub_hashes
+                .insert(entry.file_name().to_str().unwrap().to_owned(), hash_file(&entry.path()));
+        }
+    }
+    #[allow(deprecated)]
+    let mut hasher = std::hash::SipHasher::new();
+    std::hash::Hash::hash(&sub_hashes, &mut hasher);
+    std::hash::Hasher::finish(&hasher)
+}
+
 impl GitRepo {
     pub(crate) const fn github(
         user: &'static str,
         repo: &'static str,
         rev: &'static str,
+        content_hash: &'static str,
         patch_name: &'static str,
     ) -> GitRepo {
-        GitRepo { url: GitRepoUrl::Github { user, repo }, rev, patch_name }
+        GitRepo { url: GitRepoUrl::Github { user, repo }, rev, content_hash, patch_name }
+    }
+
+    fn download_dir(&self, dirs: &Dirs) -> PathBuf {
+        match self.url {
+            GitRepoUrl::Github { user: _, repo } => RelPath::DOWNLOAD.join(repo).to_path(dirs),
+        }
     }
 
     pub(crate) const fn source_dir(&self) -> RelPath {
         match self.url {
-            GitRepoUrl::Github { user: _, repo } => RelPath::DOWNLOAD.join(repo),
+            GitRepoUrl::Github { user: _, repo } => RelPath::BUILD.join(repo),
         }
     }
 
     pub(crate) fn fetch(&self, dirs: &Dirs) {
+        let download_dir = self.download_dir(dirs);
+
+        if download_dir.exists() {
+            let actual_hash = format!("{:016x}", hash_dir(&download_dir));
+            if actual_hash == self.content_hash {
+                println!("[FRESH] {}", download_dir.display());
+                return;
+            } else {
+                println!(
+                    "Mismatched content hash for {download_dir}: {actual_hash} != {content_hash}. Downloading again.",
+                    download_dir = download_dir.display(),
+                    content_hash = self.content_hash,
+                );
+            }
+        }
+
         match self.url {
             GitRepoUrl::Github { user, repo } => {
-                clone_repo_shallow_github(
-                    dirs,
-                    &self.source_dir().to_path(dirs),
-                    user,
-                    repo,
-                    self.rev,
-                );
+                clone_repo_shallow_github(dirs, &download_dir, user, repo, self.rev);
             }
         }
-        apply_patches(dirs, self.patch_name, &self.source_dir().to_path(dirs));
+
+        let source_lockfile =
+            RelPath::PATCHES.to_path(dirs).join(format!("{}-lock.toml", self.patch_name));
+        let target_lockfile = download_dir.join("Cargo.lock");
+        if source_lockfile.exists() {
+            fs::copy(source_lockfile, target_lockfile).unwrap();
+        } else {
+            assert!(target_lockfile.exists());
+        }
+
+        let actual_hash = format!("{:016x}", hash_dir(&download_dir));
+        if actual_hash != self.content_hash {
+            println!(
+                "Download of {download_dir} failed with mismatched content hash: {actual_hash} != {content_hash}",
+                download_dir = download_dir.display(),
+                content_hash = self.content_hash,
+            );
+            std::process::exit(1);
+        }
+    }
+
+    pub(crate) fn patch(&self, dirs: &Dirs) {
+        apply_patches(
+            dirs,
+            self.patch_name,
+            &self.download_dir(dirs),
+            &self.source_dir().to_path(dirs),
+        );
     }
 }
 
@@ -118,6 +181,8 @@ fn clone_repo(download_dir: &Path, repo: &str, rev: &str) {
     let mut checkout_cmd = git_command(download_dir, "checkout");
     checkout_cmd.arg("-q").arg(rev);
     spawn_and_wait(checkout_cmd);
+
+    std::fs::remove_dir_all(download_dir.join(".git")).unwrap();
 }
 
 fn clone_repo_shallow_github(dirs: &Dirs, download_dir: &Path, user: &str, repo: &str, rev: &str) {
@@ -165,8 +230,6 @@ fn clone_repo_shallow_github(dirs: &Dirs, download_dir: &Path, user: &str, repo:
     // Rename unpacked dir to the expected name
     std::fs::rename(archive_dir, &download_dir).unwrap();
 
-    init_git_repo(&download_dir);
-
     // Cleanup
     std::fs::remove_file(archive_file).unwrap();
 }
@@ -205,7 +268,22 @@ fn get_patches(dirs: &Dirs, crate_name: &str) -> Vec<PathBuf> {
     patches
 }
 
-fn apply_patches(dirs: &Dirs, crate_name: &str, target_dir: &Path) {
+pub(crate) fn apply_patches(dirs: &Dirs, crate_name: &str, source_dir: &Path, target_dir: &Path) {
+    // FIXME avoid copy and patch if src, patches and target are unchanged
+
+    eprintln!("[COPY] {crate_name} source");
+
+    remove_dir_if_exists(target_dir);
+    fs::create_dir_all(target_dir).unwrap();
+    if crate_name == "stdlib" {
+        fs::create_dir(target_dir.join("library")).unwrap();
+        copy_dir_recursively(&source_dir.join("library"), &target_dir.join("library"));
+    } else {
+        copy_dir_recursively(source_dir, target_dir);
+    }
+
+    init_git_repo(target_dir);
+
     if crate_name == "<none>" {
         return;
     }
diff --git a/build_system/rustc_info.rs b/build_system/rustc_info.rs
index 42cec0c6935..5b71504e90a 100644
--- a/build_system/rustc_info.rs
+++ b/build_system/rustc_info.rs
@@ -1,12 +1,6 @@
 use std::path::{Path, PathBuf};
 use std::process::{Command, Stdio};
 
-pub(crate) fn get_rustc_version(rustc: &Path) -> String {
-    let version_info =
-        Command::new(rustc).stderr(Stdio::inherit()).args(&["-V"]).output().unwrap().stdout;
-    String::from_utf8(version_info).unwrap()
-}
-
 pub(crate) fn get_host_triple(rustc: &Path) -> String {
     let version_info =
         Command::new(rustc).stderr(Stdio::inherit()).args(&["-vV"]).output().unwrap().stdout;
diff --git a/build_system/tests.rs b/build_system/tests.rs
index 7efb960697e..08d8f708c7d 100644
--- a/build_system/tests.rs
+++ b/build_system/tests.rs
@@ -1,12 +1,14 @@
 use super::build_sysroot;
 use super::config;
 use super::path::{Dirs, RelPath};
-use super::prepare::GitRepo;
+use super::prepare::{apply_patches, GitRepo};
+use super::rustc_info::get_default_sysroot;
 use super::utils::{spawn_and_wait, spawn_and_wait_with_input, CargoProject, Compiler};
 use super::{CodegenBackend, SysrootKind};
 use std::env;
 use std::ffi::OsStr;
 use std::fs;
+use std::path::PathBuf;
 use std::process::Command;
 
 static BUILD_EXAMPLE_OUT_DIR: RelPath = RelPath::BUILD.join("example");
@@ -17,7 +19,7 @@ struct TestCase {
 }
 
 enum TestCaseCmd {
-    Custom { func: &'static dyn Fn(&TestRunner) },
+    Custom { func: &'static dyn Fn(&TestRunner<'_>) },
     BuildLib { source: &'static str, crate_types: &'static str },
     BuildBinAndRun { source: &'static str, args: &'static [&'static str] },
     JitBin { source: &'static str, args: &'static str },
@@ -25,7 +27,7 @@ enum TestCaseCmd {
 
 impl TestCase {
     // FIXME reduce usage of custom test case commands
-    const fn custom(config: &'static str, func: &'static dyn Fn(&TestRunner)) -> Self {
+    const fn custom(config: &'static str, func: &'static dyn Fn(&TestRunner<'_>)) -> Self {
         Self { config, cmd: TestCaseCmd::Custom { func } }
     }
 
@@ -94,32 +96,45 @@ const BASE_SYSROOT_SUITE: &[TestCase] = &[
 
 // FIXME(rust-random/rand#1293): Newer rand versions fail to test on Windows. Update once this is
 // fixed.
-pub(crate) static RAND_REPO: GitRepo =
-    GitRepo::github("rust-random", "rand", "50b9a447410860af8d6db9a208c3576886955874", "rand");
+pub(crate) static RAND_REPO: GitRepo = GitRepo::github(
+    "rust-random",
+    "rand",
+    "50b9a447410860af8d6db9a208c3576886955874",
+    "446203b96054891e",
+    "rand",
+);
 
-pub(crate) static RAND: CargoProject = CargoProject::new(&RAND_REPO.source_dir(), "rand");
+pub(crate) static RAND: CargoProject = CargoProject::new(&RAND_REPO.source_dir(), "rand_target");
 
-pub(crate) static REGEX_REPO: GitRepo =
-    GitRepo::github("rust-lang", "regex", "32fed9429eafba0ae92a64b01796a0c5a75b88c8", "regex");
+pub(crate) static REGEX_REPO: GitRepo = GitRepo::github(
+    "rust-lang",
+    "regex",
+    "32fed9429eafba0ae92a64b01796a0c5a75b88c8",
+    "fcc4df7c5b902633",
+    "regex",
+);
 
-pub(crate) static REGEX: CargoProject = CargoProject::new(&REGEX_REPO.source_dir(), "regex");
+pub(crate) static REGEX: CargoProject = CargoProject::new(&REGEX_REPO.source_dir(), "regex_target");
 
 pub(crate) static PORTABLE_SIMD_REPO: GitRepo = GitRepo::github(
     "rust-lang",
     "portable-simd",
     "ad8afa8c81273b3b49acbea38cd3bcf17a34cf2b",
+    "800548f8000e31bd",
     "portable-simd",
 );
 
 pub(crate) static PORTABLE_SIMD: CargoProject =
-    CargoProject::new(&PORTABLE_SIMD_REPO.source_dir(), "portable_simd");
+    CargoProject::new(&PORTABLE_SIMD_REPO.source_dir(), "portable-simd_target");
 
-pub(crate) static LIBCORE_TESTS_SRC: RelPath = RelPath::DOWNLOAD.join("coretests_src");
+static LIBCORE_TESTS_SRC: RelPath = RelPath::BUILD.join("coretests");
 
-pub(crate) static LIBCORE_TESTS: CargoProject = CargoProject::new(&LIBCORE_TESTS_SRC, "core_tests");
+static LIBCORE_TESTS: CargoProject = CargoProject::new(&LIBCORE_TESTS_SRC, "coretests_target");
 
 const EXTENDED_SYSROOT_SUITE: &[TestCase] = &[
     TestCase::custom("test.rust-random/rand", &|runner| {
+        RAND_REPO.patch(&runner.dirs);
+
         RAND.clean(&runner.dirs);
 
         if runner.is_native {
@@ -134,6 +149,17 @@ const EXTENDED_SYSROOT_SUITE: &[TestCase] = &[
         }
     }),
     TestCase::custom("test.libcore", &|runner| {
+        apply_patches(
+            &runner.dirs,
+            "coretests",
+            &runner.stdlib_source.join("library/core/tests"),
+            &LIBCORE_TESTS_SRC.to_path(&runner.dirs),
+        );
+
+        let source_lockfile = RelPath::PATCHES.to_path(&runner.dirs).join("coretests-lock.toml");
+        let target_lockfile = LIBCORE_TESTS_SRC.to_path(&runner.dirs).join("Cargo.lock");
+        fs::copy(source_lockfile, target_lockfile).unwrap();
+
         LIBCORE_TESTS.clean(&runner.dirs);
 
         if runner.is_native {
@@ -148,6 +174,8 @@ const EXTENDED_SYSROOT_SUITE: &[TestCase] = &[
         }
     }),
     TestCase::custom("test.regex-shootout-regex-dna", &|runner| {
+        REGEX_REPO.patch(&runner.dirs);
+
         REGEX.clean(&runner.dirs);
 
         let mut build_cmd = REGEX.build(&runner.target_compiler, &runner.dirs);
@@ -180,6 +208,8 @@ const EXTENDED_SYSROOT_SUITE: &[TestCase] = &[
         }
     }),
     TestCase::custom("test.regex", &|runner| {
+        REGEX_REPO.patch(&runner.dirs);
+
         REGEX.clean(&runner.dirs);
 
         if runner.is_native {
@@ -196,6 +226,8 @@ const EXTENDED_SYSROOT_SUITE: &[TestCase] = &[
         }
     }),
     TestCase::custom("test.portable-simd", &|runner| {
+        PORTABLE_SIMD_REPO.patch(&runner.dirs);
+
         PORTABLE_SIMD.clean(&runner.dirs);
 
         let mut build_cmd = PORTABLE_SIMD.build(&runner.target_compiler, &runner.dirs);
@@ -215,12 +247,17 @@ pub(crate) fn run_tests(
     channel: &str,
     sysroot_kind: SysrootKind,
     use_unstable_features: bool,
+    skip_tests: &[&str],
     cg_clif_dylib: &CodegenBackend,
     bootstrap_host_compiler: &Compiler,
     rustup_toolchain_name: Option<&str>,
     target_triple: String,
 ) {
-    if config::get_bool("testsuite.no_sysroot") {
+    let stdlib_source =
+        get_default_sysroot(&bootstrap_host_compiler.rustc).join("lib/rustlib/src/rust");
+    assert!(stdlib_source.exists());
+
+    if config::get_bool("testsuite.no_sysroot") && !skip_tests.contains(&"testsuite.no_sysroot") {
         let target_compiler = build_sysroot::build_sysroot(
             dirs,
             channel,
@@ -235,7 +272,9 @@ pub(crate) fn run_tests(
             dirs.clone(),
             target_compiler,
             use_unstable_features,
+            skip_tests,
             bootstrap_host_compiler.triple == target_triple,
+            stdlib_source.clone(),
         );
 
         BUILD_EXAMPLE_OUT_DIR.ensure_fresh(dirs);
@@ -244,8 +283,10 @@ pub(crate) fn run_tests(
         eprintln!("[SKIP] no_sysroot tests");
     }
 
-    let run_base_sysroot = config::get_bool("testsuite.base_sysroot");
-    let run_extended_sysroot = config::get_bool("testsuite.extended_sysroot");
+    let run_base_sysroot = config::get_bool("testsuite.base_sysroot")
+        && !skip_tests.contains(&"testsuite.base_sysroot");
+    let run_extended_sysroot = config::get_bool("testsuite.extended_sysroot")
+        && !skip_tests.contains(&"testsuite.extended_sysroot");
 
     if run_base_sysroot || run_extended_sysroot {
         let mut target_compiler = build_sysroot::build_sysroot(
@@ -265,7 +306,9 @@ pub(crate) fn run_tests(
             dirs.clone(),
             target_compiler,
             use_unstable_features,
+            skip_tests,
             bootstrap_host_compiler.triple == target_triple,
+            stdlib_source,
         );
 
         if run_base_sysroot {
@@ -282,20 +325,24 @@ pub(crate) fn run_tests(
     }
 }
 
-struct TestRunner {
+struct TestRunner<'a> {
     is_native: bool,
     jit_supported: bool,
     use_unstable_features: bool,
+    skip_tests: &'a [&'a str],
     dirs: Dirs,
     target_compiler: Compiler,
+    stdlib_source: PathBuf,
 }
 
-impl TestRunner {
+impl<'a> TestRunner<'a> {
     fn new(
         dirs: Dirs,
         mut target_compiler: Compiler,
         use_unstable_features: bool,
+        skip_tests: &'a [&'a str],
         is_native: bool,
+        stdlib_source: PathBuf,
     ) -> Self {
         if let Ok(rustflags) = env::var("RUSTFLAGS") {
             target_compiler.rustflags.push(' ');
@@ -316,7 +363,15 @@ impl TestRunner {
             && target_compiler.triple.contains("x86_64")
             && !target_compiler.triple.contains("windows");
 
-        Self { is_native, jit_supported, use_unstable_features, dirs, target_compiler }
+        Self {
+            is_native,
+            jit_supported,
+            use_unstable_features,
+            skip_tests,
+            dirs,
+            target_compiler,
+            stdlib_source,
+        }
     }
 
     fn run_testsuite(&self, tests: &[TestCase]) {
@@ -325,7 +380,10 @@ impl TestRunner {
             let tag = tag.to_uppercase();
             let is_jit_test = tag == "JIT";
 
-            if !config::get_bool(config) || (is_jit_test && !self.jit_supported) {
+            if !config::get_bool(config)
+                || (is_jit_test && !self.jit_supported)
+                || self.skip_tests.contains(&config)
+            {
                 eprintln!("[{tag}] {testname} (skipped)");
                 continue;
             } else {
diff --git a/build_system/usage.txt b/build_system/usage.txt
index 3bc18a93331..6d3b3a13d6e 100644
--- a/build_system/usage.txt
+++ b/build_system/usage.txt
@@ -1,11 +1,11 @@
 The build system of cg_clif.
 
 USAGE:
-    ./y.rs prepare [--out-dir DIR]
-    ./y.rs build [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--no-unstable-features] [--frozen]
-    ./y.rs test [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--no-unstable-features] [--frozen]
-    ./y.rs abi-cafe [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--no-unstable-features] [--frozen]
-    ./y.rs bench [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--no-unstable-features] [--frozen]
+    ./y.sh prepare [--out-dir DIR] [--download-dir DIR]
+    ./y.sh build [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--download-dir DIR] [--no-unstable-features] [--frozen]
+    ./y.sh test [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--download-dir DIR] [--no-unstable-features] [--frozen] [--skip-test TESTNAME]
+    ./y.sh abi-cafe [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--download-dir DIR] [--no-unstable-features] [--frozen]
+    ./y.sh bench [--debug] [--sysroot none|clif|llvm] [--out-dir DIR] [--download-dir DIR] [--no-unstable-features] [--frozen]
 
 OPTIONS:
     --debug
@@ -22,6 +22,9 @@ OPTIONS:
             Specify the directory in which the download, build and dist directories are stored.
             By default this is the working directory.
 
+    --download-dir DIR
+            Specify the directory in which the download directory is stored. Overrides --out-dir.
+
     --no-unstable-features
             Some features are not yet ready for production usage. This option will disable these
             features. This includes the JIT mode and inline assembly support.
@@ -29,6 +32,9 @@ OPTIONS:
     --frozen
             Require Cargo.lock and cache are up to date
 
+    --skip-test TESTNAME
+            Skip testing the TESTNAME test. The test name format is the same as config.txt.
+
     --use-backend NAME
             Use the existing Cranelift (or other) backend of the rustc with which we built.
             Warning: This is meant for use in rust's CI only!
@@ -37,7 +43,7 @@ REQUIREMENTS:
     * Rustup: By default rustup is used to install the right nightly version. If you don't want to
       use rustup, you can manually install the nightly version indicated by rust-toolchain.toml and
       point the CARGO, RUSTC and RUSTDOC env vars to the right executables.
-    * Git: `./y.rs prepare` uses git for applying patches and on Windows for downloading test repos.
-    * Curl and tar (non-Windows only): Used by `./y.rs prepare` to download a single commit for
+    * Git: `./y.sh prepare` uses git for applying patches and on Windows for downloading test repos.
+    * Curl and tar (non-Windows only): Used by `./y.sh prepare` to download a single commit for
       repos. Git will be used to clone the whole repo when using Windows.
-    * [Hyperfine](https://github.com/sharkdp/hyperfine/): Used for benchmarking with `./y.rs bench`.
+    * [Hyperfine](https://github.com/sharkdp/hyperfine/): Used for benchmarking with `./y.sh bench`.
diff --git a/build_system/utils.rs b/build_system/utils.rs
index 3e12ed22ef6..41fc366e290 100644
--- a/build_system/utils.rs
+++ b/build_system/utils.rs
@@ -81,7 +81,8 @@ impl CargoProject {
             .arg("--manifest-path")
             .arg(self.manifest_path(dirs))
             .arg("--target-dir")
-            .arg(self.target_dir(dirs));
+            .arg(self.target_dir(dirs))
+            .arg("--locked");
 
         if dirs.frozen {
             cmd.arg("--frozen");
@@ -257,3 +258,13 @@ pub(crate) fn is_ci() -> bool {
 pub(crate) fn is_ci_opt() -> bool {
     env::var("CI_OPT").is_ok()
 }
+
+pub(crate) fn maybe_incremental(cmd: &mut Command) {
+    if is_ci() || std::env::var("CARGO_BUILD_INCREMENTAL").map_or(false, |val| val == "false") {
+        // Disabling incr comp reduces cache size and incr comp doesn't save as much on CI anyway
+        cmd.env("CARGO_BUILD_INCREMENTAL", "false");
+    } else {
+        // Force incr comp even in release mode unless in CI or incremental builds are explicitly disabled
+        cmd.env("CARGO_BUILD_INCREMENTAL", "true");
+    }
+}
diff --git a/clean_all.sh b/clean_all.sh
index cdfc2e143e6..19405a53d1c 100755
--- a/clean_all.sh
+++ b/clean_all.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -e
 
-rm -rf target/ download/ build/ dist/ y.bin y.bin.dSYM y.exe y.pdb
+rm -rf target/ build_system/target download/ build/ dist/ y.bin y.bin.dSYM y.exe y.pdb
 
 # Kept for now in case someone updates their checkout of cg_clif before running clean_all.sh
 # FIXME remove at some point in the future
diff --git a/docs/usage.md b/docs/usage.md
index 4c2b0fa1704..c6210f958d6 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -2,7 +2,7 @@
 
 rustc_codegen_cranelift can be used as a near-drop-in replacement for `cargo build` or `cargo run` for existing projects.
 
-Assuming `$cg_clif_dir` is the directory you cloned this repo into and you followed the instructions (`y.rs prepare` and `y.rs build` or `test.sh`).
+Assuming `$cg_clif_dir` is the directory you cloned this repo into and you followed the instructions (`y.sh prepare` and `y.sh build` or `test.sh`).
 
 ## Cargo
 
diff --git a/patches/coretests-lock.toml b/patches/coretests-lock.toml
new file mode 100644
index 00000000000..af8f28a193b
--- /dev/null
+++ b/patches/coretests-lock.toml
@@ -0,0 +1,35 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "coretests"
+version = "0.0.0"
+dependencies = [
+ "rand",
+ "rand_xorshift",
+]
+
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+
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+version = "0.3.0"
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+dependencies = [
+ "rand_core",
+]
diff --git a/patches/portable-simd-lock.toml b/patches/portable-simd-lock.toml
new file mode 100644
index 00000000000..e7db1fd2c7f
--- /dev/null
+++ b/patches/portable-simd-lock.toml
@@ -0,0 +1,304 @@
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+# It is not intended for manual editing.
+version = 3
+
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+version = "1.1.0"
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diff --git a/patches/rand-lock.toml b/patches/rand-lock.toml
new file mode 100644
index 00000000000..66c515731c5
--- /dev/null
+++ b/patches/rand-lock.toml
@@ -0,0 +1,346 @@
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+checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
+
+[[package]]
+name = "xattr"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d1526bbe5aaeb5eb06885f4d987bcdfa5e23187055de9b83fe00156a821fabc"
+dependencies = [
+ "libc",
+]
diff --git a/build_sysroot/Cargo.lock b/patches/stdlib-lock.toml
index ef99acb8211..1dde9e54d7e 100644
--- a/build_sysroot/Cargo.lock
+++ b/patches/stdlib-lock.toml
@@ -30,9 +30,27 @@ version = "0.0.0"
 dependencies = [
  "compiler_builtins",
  "core",
+ "rand",
+ "rand_xorshift",
 ]
 
 [[package]]
+name = "auxv"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e50430f9beb8effb02399fa81c76eeaa26b05e4f03b09285cad8d079c1af5a3d"
+dependencies = [
+ "byteorder",
+ "gcc",
+]
+
+[[package]]
+name = "byteorder"
+version = "1.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+
+[[package]]
 name = "cc"
 version = "1.0.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -54,12 +72,27 @@ version = "0.1.93"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "76630810d973ecea3dbf611e1b7aecfb1012751ef1ff8de3998f89014a166781"
 dependencies = [
+ "cc",
  "rustc-std-workspace-core",
 ]
 
 [[package]]
 name = "core"
 version = "0.0.0"
+dependencies = [
+ "rand",
+ "rand_xorshift",
+]
+
+[[package]]
+name = "cupid"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8bad352a84b567cc38a5854e3aa8ee903cb8519a25d0b799b739bafffd1f91a1"
+dependencies = [
+ "gcc",
+ "rustc_version",
+]
 
 [[package]]
 name = "dlmalloc"
@@ -83,6 +116,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "gcc"
+version = "0.3.55"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f5f3913fa0bfe7ee1fd8248b6b9f42a5af4b9d65ec2dd2c3c26132b950ecfc2"
+
+[[package]]
 name = "getopts"
 version = "0.2.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -201,6 +240,39 @@ dependencies = [
 ]
 
 [[package]]
+name = "profiler_builtins"
+version = "0.0.0"
+dependencies = [
+ "cc",
+ "compiler_builtins",
+ "core",
+]
+
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+
+[[package]]
+name = "rand_xorshift"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d25bf25ec5ae4a3f1b92f929810509a2f53d7dca2f50b794ff57e3face536c8f"
+dependencies = [
+ "rand_core",
+]
+
+[[package]]
 name = "rustc-demangle"
 version = "0.1.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -232,6 +304,30 @@ dependencies = [
 ]
 
 [[package]]
+name = "rustc_version"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "138e3e0acb6c9fb258b19b67cb8abd63c00679d2851805ea151465464fe9030a"
+dependencies = [
+ "semver",
+]
+
+[[package]]
+name = "semver"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
+dependencies = [
+ "semver-parser",
+]
+
+[[package]]
+name = "semver-parser"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
+
+[[package]]
 name = "std"
 version = "0.0.0"
 dependencies = [
@@ -249,6 +345,9 @@ dependencies = [
  "object",
  "panic_abort",
  "panic_unwind",
+ "profiler_builtins",
+ "rand",
+ "rand_xorshift",
  "rustc-demangle",
  "std_detect",
  "unwind",
@@ -259,8 +358,11 @@ dependencies = [
 name = "std_detect"
 version = "0.1.5"
 dependencies = [
+ "auxv",
  "cfg-if",
  "compiler_builtins",
+ "cupid",
+ "libc",
  "rustc-std-workspace-alloc",
  "rustc-std-workspace-core",
 ]
@@ -269,9 +371,6 @@ dependencies = [
 name = "sysroot"
 version = "0.0.0"
 dependencies = [
- "alloc",
- "compiler_builtins",
- "core",
  "proc_macro",
  "std",
  "test",
diff --git a/scripts/rustup.sh b/scripts/rustup.sh
index 3cbeb6375de..e62788f2e50 100755
--- a/scripts/rustup.sh
+++ b/scripts/rustup.sh
@@ -32,12 +32,10 @@ case $1 in
 
         ./clean_all.sh
 
-        ./y.rs prepare
-
-        (cd download/sysroot && cargo update && cargo fetch && cp Cargo.lock ../../build_sysroot/)
+        ./y.sh prepare
         ;;
     "commit")
-        git add rust-toolchain build_sysroot/Cargo.lock
+        git add rust-toolchain
         git commit -m "Rustup to $(rustc -V)"
         ;;
     "push")
diff --git a/scripts/setup_rust_fork.sh b/scripts/setup_rust_fork.sh
index abb09775d21..15b16b42be5 100644
--- a/scripts/setup_rust_fork.sh
+++ b/scripts/setup_rust_fork.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -e
 
-./y.rs build --no-unstable-features
+./y.sh build --no-unstable-features
 
 echo "[SETUP] Rust fork"
 git clone https://github.com/rust-lang/rust.git || true
diff --git a/src/config.rs b/src/config.rs
index 263401e1c4b..9e92d656c76 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -82,6 +82,11 @@ impl BackendConfig {
 
         let mut config = BackendConfig::default();
         for opt in opts {
+            if opt.starts_with("-import-instr-limit") {
+                // Silently ignore -import-instr-limit. It is set by rust's build system even when
+                // testing cg_clif.
+                continue;
+            }
             if let Some((name, value)) = opt.split_once('=') {
                 match name {
                     "mode" => config.codegen_mode = value.parse()?,
diff --git a/test.sh b/test.sh
index 13e7784539d..6357eebf026 100755
--- a/test.sh
+++ b/test.sh
@@ -1,2 +1,2 @@
 #!/usr/bin/env bash
-exec ./y.rs test "$@"
+exec ./y.sh test "$@"
diff --git a/y.rs b/y.rs
index a68a10500f5..e806a64d943 100755
--- a/y.rs
+++ b/y.rs
@@ -1,35 +1,6 @@
 #!/usr/bin/env bash
 #![deny(unsafe_code)] /*This line is ignored by bash
 # This block is ignored by rustc
-set -e
-echo "[BUILD] y.rs" 1>&2
-rustc $0 -o ${0/.rs/.bin} -Cdebuginfo=1 --edition 2021
-exec ${0/.rs/.bin} $@
+echo "Warning: y.rs is a deprecated alias for y.sh" 1>&2
+exec ./y.sh "$@"
 */
-
-#![warn(rust_2018_idioms)]
-#![warn(unused_lifetimes)]
-#![warn(unreachable_pub)]
-
-//! The build system for cg_clif
-//!
-//! # Manual compilation
-//!
-//! If your system doesn't support shell scripts you can manually compile and run this file using
-//! for example:
-//!
-//! ```shell
-//! $ rustc y.rs -o y.bin
-//! $ ./y.bin
-//! ```
-//!
-//! # Naming
-//!
-//! The name `y.rs` was chosen to not conflict with rustc's `x.py`.
-
-#[path = "build_system/mod.rs"]
-mod build_system;
-
-fn main() {
-    build_system::main();
-}
diff --git a/y.sh b/y.sh
new file mode 100755
index 00000000000..bc925a23e2a
--- /dev/null
+++ b/y.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+set -e
+echo "[BUILD] build system" 1>&2
+rustc build_system/main.rs -o y.bin -Cdebuginfo=1 --edition 2021
+exec ./y.bin "$@"
author	bjorn3 <17426603+bjorn3@users.noreply.github.com>	2023-06-15 19:37:23 +0200
committer	GitHub <noreply@github.com>	2023-06-15 19:37:23 +0200
commit	f2895f314342814ff4ee87b73cf4b3eefcf13868 (patch)
tree	5bc67aff79b182c57f006bdbe45e132e87f1ff2e
parent	45781e107c37524386478b02082700f09bd10d78 (diff)
parent	e9bd63af3cfc192f0f998debbf5ab3e597781cec (diff)
download	rust-f2895f314342814ff4ee87b73cf4b3eefcf13868.tar.gz rust-f2895f314342814ff4ee87b73cf4b3eefcf13868.zip