From d21adb9158d1b3628855f49c58a3b65fc24c4332 Mon Sep 17 00:00:00 2001
From: Nadrieril <nadrieril+git@gmail.com>
Date: Thu, 4 Dec 2025 20:21:27 +0100
Subject: [PATCH] bootstrap: add `rustc-dev` install target

---
 src/bootstrap/src/core/build_steps/dist.rs    |  4 ++--
 src/bootstrap/src/core/build_steps/install.rs | 11 +++++++++++
 src/bootstrap/src/core/builder/mod.rs         |  1 +
 3 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/bootstrap/src/core/build_steps/dist.rs b/src/bootstrap/src/core/build_steps/dist.rs
index 40149ee09427c..caf0af35e401d 100644
--- a/src/bootstrap/src/core/build_steps/dist.rs
+++ b/src/bootstrap/src/core/build_steps/dist.rs
@@ -892,8 +892,8 @@ impl Step for Std {
 #[derive(Debug, Clone, Hash, PartialEq, Eq)]
 pub struct RustcDev {
     /// The compiler that will build rustc which will be shipped in this component.
-    build_compiler: Compiler,
-    target: TargetSelection,
+    pub build_compiler: Compiler,
+    pub target: TargetSelection,
 }
 
 impl RustcDev {
diff --git a/src/bootstrap/src/core/build_steps/install.rs b/src/bootstrap/src/core/build_steps/install.rs
index d52cc52abbd3e..d23fe029bcc7e 100644
--- a/src/bootstrap/src/core/build_steps/install.rs
+++ b/src/bootstrap/src/core/build_steps/install.rs
@@ -279,6 +279,17 @@ install!((self, builder, _config),
         });
         install_sh(builder, "rustc", self.build_compiler, Some(self.target), &tarball);
     };
+    RustcDev, alias = "rustc-dev", Self::should_build(_config), IS_HOST: true, {
+        if let Some(tarball) = builder.ensure(dist::RustcDev {
+            build_compiler: self.build_compiler, target: self.target
+        }) {
+            install_sh(builder, "rustc-dev", self.build_compiler, Some(self.target), &tarball);
+        } else {
+            builder.info(
+                &format!("skipping Install RustcDev stage{} ({})", self.build_compiler.stage + 1, self.target),
+            );
+        }
+    };
     RustcCodegenCranelift, alias = "rustc-codegen-cranelift", Self::should_build(_config), IS_HOST: true, {
         if let Some(tarball) = builder.ensure(dist::CraneliftCodegenBackend {
             compilers: RustcPrivateCompilers::from_build_compiler(builder, self.build_compiler, self.target),
diff --git a/src/bootstrap/src/core/builder/mod.rs b/src/bootstrap/src/core/builder/mod.rs
index 961d0cd855ae3..0bf70883a47ae 100644
--- a/src/bootstrap/src/core/builder/mod.rs
+++ b/src/bootstrap/src/core/builder/mod.rs
@@ -998,6 +998,7 @@ impl<'a> Builder<'a> {
                 // binary path, we must install rustc before the tools. Otherwise, the rust-installer will
                 // install the same binaries twice for each tool, leaving backup files (*.old) as a result.
                 install::Rustc,
+                install::RustcDev,
                 install::Cargo,
                 install::RustAnalyzer,
                 install::Rustfmt,