Patch coretests separately from the standard library source

build_system/prepare.rs

@@ -6,6 +6,7 @@ use std::process::Command;
 use super::build_sysroot::{BUILD_SYSROOT, ORIG_BUILD_SYSROOT, SYSROOT_RUSTC_VERSION, SYSROOT_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) {
@@ -13,8 +14,10 @@ pub(crate) fn prepare(dirs: &Dirs) {
 
     spawn_and_wait(super::build_backend::CG_CLIF.fetch("cargo", "rustc", dirs));
 
-    prepare_sysroot(dirs);
+    prepare_stdlib(dirs);
     spawn_and_wait(super::build_sysroot::STANDARD_LIBRARY.fetch("cargo", "rustc", dirs));
+
+    prepare_coretests(dirs);
     spawn_and_wait(super::tests::LIBCORE_TESTS.fetch("cargo", "rustc", dirs));
 
     super::tests::RAND_REPO.fetch(dirs);
@@ -25,11 +28,11 @@ pub(crate) fn prepare(dirs: &Dirs) {
     spawn_and_wait(super::tests::PORTABLE_SIMD.fetch("cargo", "rustc", dirs));
 }
 
-fn prepare_sysroot(dirs: &Dirs) {
+fn prepare_stdlib(dirs: &Dirs) {
     let sysroot_src_orig = get_default_sysroot(Path::new("rustc")).join("lib/rustlib/src/rust");
     assert!(sysroot_src_orig.exists());
 
-    eprintln!("[COPY] sysroot src");
+    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);
@@ -47,7 +50,25 @@ fn prepare_sysroot(dirs: &Dirs) {
     eprintln!("[GIT] init");
     init_git_repo(&SYSROOT_SRC.to_path(dirs));
 
-    apply_patches(dirs, "sysroot", &SYSROOT_SRC.to_path(dirs));
+    apply_patches(dirs, "stdlib", &SYSROOT_SRC.to_path(dirs));
+}
+
+fn prepare_coretests(dirs: &Dirs) {
+    let sysroot_src_orig = get_default_sysroot(Path::new("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));
 }
 
 pub(crate) struct GitRepo {

build_system/tests.rs

@@ -1,4 +1,4 @@
-use super::build_sysroot::{self, SYSROOT_SRC};
+use super::build_sysroot;
 use super::config;
 use super::path::{Dirs, RelPath};
 use super::prepare::GitRepo;
@@ -114,8 +114,9 @@ pub(crate) static PORTABLE_SIMD_REPO: GitRepo = GitRepo::github(
 pub(crate) static PORTABLE_SIMD: CargoProject =
     CargoProject::new(&PORTABLE_SIMD_REPO.source_dir(), "portable_simd");
 
-pub(crate) static LIBCORE_TESTS: CargoProject =
-    CargoProject::new(&SYSROOT_SRC.join("library/core/tests"), "core_tests");
+pub(crate) static LIBCORE_TESTS_SRC: RelPath = RelPath::DOWNLOAD.join("coretests_src");
+
+pub(crate) static LIBCORE_TESTS: CargoProject = CargoProject::new(&LIBCORE_TESTS_SRC, "core_tests");
 
 const EXTENDED_SYSROOT_SUITE: &[TestCase] = &[
     TestCase::custom("test.rust-random/rand", &|runner| {

patches/0022-coretests-Disable-not-compiling-tests.patch

@@ -13,14 +13,14 @@ Subject: [PATCH] [core] Disable not compiling tests
  6 files changed, 16 insertions(+), 1 deletion(-)
  create mode 100644 library/core/tests/Cargo.toml
 
-diff --git a/library/core/tests/Cargo.toml b/library/core/tests/Cargo.toml
+diff --git a/Cargo.toml b/Cargo.toml
 new file mode 100644
 index 0000000..46fd999
 --- /dev/null
-+++ b/library/core/tests/Cargo.toml
++++ b/Cargo.toml
 @@ -0,0 +1,12 @@
 +[package]
-+name = "core"
++name = "coretests"
 +version = "0.0.0"
 +edition = "2021"
 +
@@ -31,10 +31,10 @@ index 0000000..46fd999
 +[dependencies]
 +rand = { version = "0.8.5", default-features = false }
 +rand_xorshift = { version = "0.3.0", default-features = false }
-diff --git a/library/core/tests/lib.rs b/library/core/tests/lib.rs
+diff --git a/lib.rs b/lib.rs
 index 42a26ae..5ac1042 100644
---- a/library/core/tests/lib.rs
-+++ b/library/core/tests/lib.rs
+--- a/lib.rs
++++ b/lib.rs
 @@ -1,3 +1,4 @@
 +#![cfg(test)]
  #![feature(alloc_layout_extra)]

patches/0023-coretests-Ignore-failing-tests.patch

@@ -10,10 +10,10 @@ Subject: [PATCH] [core] Ignore failing tests
  library/core/tests/time.rs       |  1 +
  4 files changed, 18 insertions(+), 2 deletions(-)
 
-diff --git a/library/core/tests/array.rs b/library/core/tests/array.rs
+diff --git a/array.rs b/array.rs
 index 4bc44e9..8e3c7a4 100644
---- a/library/core/tests/array.rs
-+++ b/library/core/tests/array.rs
+--- a/array.rs
++++ b/array.rs
 @@ -242,6 +242,7 @@ fn iterator_drops() {
      assert_eq!(i.get(), 5);
  }
@@ -46,10 +46,10 @@ index 4bc44e9..8e3c7a4 100644
  
  #[test]
  fn cell_allows_array_cycle() {
-diff --git a/library/core/tests/atomic.rs b/library/core/tests/atomic.rs
+diff --git a/atomic.rs b/atomic.rs
 index 13b12db..96fe4b9 100644
---- a/library/core/tests/atomic.rs
-+++ b/library/core/tests/atomic.rs
+--- a/atomic.rs
++++ b/atomic.rs
 @@ -185,6 +185,7 @@ fn ptr_bitops() {
  }
  

patches/0027-coretests-128bit-atomic-operations.patch

@@ -0,0 +1,30 @@
+From ad7ffe71baba46865f2e65266ab025920dfdc20b Mon Sep 17 00:00:00 2001
+From: bjorn3 <bjorn3@users.noreply.github.com>
+Date: Thu, 18 Feb 2021 18:45:28 +0100
+Subject: [PATCH] Disable 128bit atomic operations
+
+Cranelift doesn't support them yet
+---
+ library/core/src/panic/unwind_safe.rs |  6 -----
+ library/core/src/sync/atomic.rs       | 38 ---------------------------
+ library/core/tests/atomic.rs          |  4 ---
+ 4 files changed, 4 insertions(+), 50 deletions(-)
+
+diff --git a/atomic.rs b/atomic.rs
+index b735957..ea728b6 100644
+--- a/atomic.rs
++++ b/atomic.rs
+@@ -185,10 +185,6 @@ fn atomic_alignment() {
+     assert_eq!(align_of::<AtomicU64>(), size_of::<AtomicU64>());
+     #[cfg(target_has_atomic = "64")]
+     assert_eq!(align_of::<AtomicI64>(), size_of::<AtomicI64>());
+-    #[cfg(target_has_atomic = "128")]
+-    assert_eq!(align_of::<AtomicU128>(), size_of::<AtomicU128>());
+-    #[cfg(target_has_atomic = "128")]
+-    assert_eq!(align_of::<AtomicI128>(), size_of::<AtomicI128>());
+     #[cfg(target_has_atomic = "ptr")]
+     assert_eq!(align_of::<AtomicUsize>(), size_of::<AtomicUsize>());
+     #[cfg(target_has_atomic = "ptr")]
+--
+2.26.2.7.g19db9cfb68
+

patches/0027-stdlib-128bit-atomic-operations.patch

@@ -85,21 +85,6 @@ index d9de37e..8293fce 100644
  
  macro_rules! atomic_int_ptr_sized {
      ( $($target_pointer_width:literal $align:literal)* ) => { $(
-diff --git a/library/core/tests/atomic.rs b/library/core/tests/atomic.rs
-index b735957..ea728b6 100644
---- a/library/core/tests/atomic.rs
-+++ b/library/core/tests/atomic.rs
-@@ -185,10 +185,6 @@ fn atomic_alignment() {
-     assert_eq!(align_of::<AtomicU64>(), size_of::<AtomicU64>());
-     #[cfg(target_has_atomic = "64")]
-     assert_eq!(align_of::<AtomicI64>(), size_of::<AtomicI64>());
--    #[cfg(target_has_atomic = "128")]
--    assert_eq!(align_of::<AtomicU128>(), size_of::<AtomicU128>());
--    #[cfg(target_has_atomic = "128")]
--    assert_eq!(align_of::<AtomicI128>(), size_of::<AtomicI128>());
-     #[cfg(target_has_atomic = "ptr")]
-     assert_eq!(align_of::<AtomicUsize>(), size_of::<AtomicUsize>());
-     #[cfg(target_has_atomic = "ptr")]
 --
 2.26.2.7.g19db9cfb68
 

patches/0028-coretests-Disable-long-running-tests.patch

@@ -7,10 +7,10 @@ Subject: [PATCH] Disable long running tests
  library/core/tests/slice.rs | 2 ++
  1 file changed, 2 insertions(+)
 
-diff --git a/library/core/tests/slice.rs b/library/core/tests/slice.rs
+diff --git a/slice.rs b/slice.rs
 index 8402833..84592e0 100644
---- a/library/core/tests/slice.rs
-+++ b/library/core/tests/slice.rs
+--- a/slice.rs
++++ b/slice.rs
 @@ -1809,6 +1809,7 @@ fn sort_unstable() {
      assert!(v == [0xDEADBEEF]);
  }

scripts/setup_rust_fork.sh

@@ -10,7 +10,7 @@ git fetch
 git checkout -- .
 git checkout "$(rustc -V | cut -d' ' -f3 | tr -d '(')"
 
-git -c user.name=Dummy -c user.email=dummy@example.com am ../patches/*-sysroot-*.patch
+git -c user.name=Dummy -c user.email=dummy@example.com am ../patches/*-stdlib-*.patch
 
 git apply - <<EOF
 diff --git a/library/alloc/Cargo.toml b/library/alloc/Cargo.toml