Auto merge of #138201 - jieyouxu:bootstrap-cycle, r=<try>

[DO NOT MERGE] debugging bootstrap cycle (too)

r? ghost

try-job: aarch64-apple

Author: bors

src/bootstrap/src/core/builder/mod.rs

@@ -1500,6 +1500,7 @@ impl<'a> Builder<'a> {
                 let mut out = String::new();
                 out += &format!("\n\nCycle in build detected when adding {step:?}\n");
                 for el in stack.iter().rev() {
+                    let el = el as &dyn Any;
                     out += &format!("\t{el:?}\n");
                 }
                 panic!("{}", out);

src/bootstrap/src/core/config/config.rs

@@ -48,6 +48,7 @@ pub(crate) const RUSTC_IF_UNCHANGED_ALLOWED_PATHS: &[&str] = &[
     ":!src/rustdoc-json-types",
     ":!tests",
     ":!triagebot.toml",
+    ":!src/bootstrap",
 ];
 
 macro_rules! check_ci_llvm {

src/ci/github-actions/jobs.yml

@@ -437,7 +437,7 @@ auto:
 
   - name: aarch64-apple
     env:
-      SCRIPT: ./x.py --stage 2 test --host=aarch64-apple-darwin --target=aarch64-apple-darwin
+      SCRIPT: BOOTSTRAP_TRACING=bootstrap=trace ./x.py --stage 2 test --host=aarch64-apple-darwin --target=aarch64-apple-darwin
       RUST_CONFIGURE_ARGS: >-
         --enable-sanitizers
         --enable-profiler