Auto merge of #141899 - Kobzol:stdarch-josh, r=Amanieu

Turn `stdarch` into a Josh subtree

In a similar vein as https://github.com/rust-lang/rust/pull/141229, this PR makes the `stdarch` repository a Josh subtree (it was previously a submodule). The initial commit of `stdarch` upon this is based is `5a7342fc16b208b1b16624e886937ed8509a6506`, which is the previous commit SHA of the `stdarch` submodule. The sync was performed according to https://hackmd.io/7pOuxnkdQDaL1Y1FQr65xg.

This was decided in https://github.com/rust-lang/stdarch/issues/1655.

Test pull PR on my fork: https://github.com/Kobzol/stdarch/pull/1
Test push PR on my fork: https://github.com/Kobzol/rust/pull/59

I plan to use the same Rust (miri-inspired) tooling that we use for `rustc-dev-guide` to enable pulls/pushes on stdarch.

Note that this repository currently doesn't have any stdarch-specific tests, so before that, the subtree should only be modified through this repository only when dealing with changes that contain "cyclical dependencies" between stdarch and rustc. The long term vision is to integrate stdarch into rust-lang/rust completely.

CC `@Amanieu`

try-job: aarch64-apple
try-job: aarch64-gnu
try-job: `x86_64-msvc-*`
try-job: x86_64-gnu
try-job: x86_64-gnu-aux

4 files changed, 1 insertions, 7 deletions

diff --git a/src/bootstrap/src/core/build_steps/check.rs b/src/bootstrap/src/core/build_steps/check.rs
index fcd4f4078ad..65d25d3fb7e 100644
--- a/src/bootstrap/src/core/build_steps/check.rs
+++ b/src/bootstrap/src/core/build_steps/check.rs
@@ -67,8 +67,6 @@ impl Step for Std {
             return;
         }
 
-        builder.require_submodule("library/stdarch", None);
-
         let stage = self.custom_stage.unwrap_or(builder.top_stage);
 
         let target = self.target;
diff --git a/src/bootstrap/src/core/build_steps/clippy.rs b/src/bootstrap/src/core/build_steps/clippy.rs
index ebf0caccfbc..29a5e1f480b 100644
--- a/src/bootstrap/src/core/build_steps/clippy.rs
+++ b/src/bootstrap/src/core/build_steps/clippy.rs
@@ -141,8 +141,6 @@ impl Step for Std {
     }
 
     fn run(self, builder: &Builder<'_>) {
-        builder.require_submodule("library/stdarch", None);
-
         let target = self.target;
         let compiler = builder.compiler(builder.top_stage, builder.config.host_target);
 
diff --git a/src/bootstrap/src/core/build_steps/compile.rs b/src/bootstrap/src/core/build_steps/compile.rs
index f6efb23e8d8..d25cba4f935 100644
--- a/src/bootstrap/src/core/build_steps/compile.rs
+++ b/src/bootstrap/src/core/build_steps/compile.rs
@@ -197,8 +197,6 @@ impl Step for Std {
             return;
         }
 
-        builder.require_submodule("library/stdarch", None);
-
         let mut target_deps = builder.ensure(StartupObjects { compiler, target });
 
         let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);
diff --git a/src/bootstrap/src/lib.rs b/src/bootstrap/src/lib.rs
index f44fe4548a1..cfa42f61d01 100644
--- a/src/bootstrap/src/lib.rs
+++ b/src/bootstrap/src/lib.rs
@@ -518,7 +518,7 @@ impl Build {
 
             // Make sure we update these before gathering metadata so we don't get an error about missing
             // Cargo.toml files.
-            let rust_submodules = ["library/backtrace", "library/stdarch"];
+            let rust_submodules = ["library/backtrace"];
             for s in rust_submodules {
                 build.require_submodule(
                     s,