Auto merge of #76573 - Mark-Simulacrum:bootstrap-with-external-llvm, …

…r=alexcrichton

Only copy LLVM into rust-dev with internal LLVM

This avoids needing to figure out where to locate each of the components with an
external LLVM. This component isn't manifested for rustup consumption and
generally shouldn't matter for anyone except Rust's CI, so it is fine for it to not be
complete elsewhere.

Fixes #76572.

r? `@alexcrichton`

src/bootstrap/dist.rs

@@ -2524,6 +2524,14 @@ impl Step for RustDev {
     fn run(self, builder: &Builder<'_>) -> Option<PathBuf> {
         let target = self.target;
 
+        /* run only if llvm-config isn't used */
+        if let Some(config) = builder.config.target_config.get(&target) {
+            if let Some(ref _s) = config.llvm_config {
+                builder.info(&format!("Skipping RustDev ({}): external LLVM", target));
+                return None;
+            }
+        }
+
         builder.info(&format!("Dist RustDev ({})", target));
         let _time = timeit(builder);
         let src = builder.src.join("src/llvm-project/llvm");
@@ -2536,6 +2544,7 @@ impl Step for RustDev {
         // Prepare the image directory
         let dst_bindir = image.join("bin");
         t!(fs::create_dir_all(&dst_bindir));
+
         let exe = builder.llvm_out(target).join("bin").join(exe("llvm-config", target));
         builder.install(&exe, &dst_bindir, 0o755);
         builder.install(&builder.llvm_filecheck(target), &dst_bindir, 0o755);