Rollup merge of rust-lang#130302 - onur-ozkan:130040-with-fixes, r=Kobzol

add llvm-bitcode-linker and llvm-tools bins to ci-rustc's sysroot

rust-lang#130040 is [reverted](rust-lang#130292) because adding component binaries directly to the dist tarball of the compiler caused conflicts (see rust-lang#130291 and rust-lang/rustup#4019). This PR solves the original problem without touching the dist tarball.

r? Kobzol

Author: Zalathar

src/bootstrap/src/core/build_steps/compile.rs

@@ -1760,6 +1760,49 @@ impl Step for Assemble {
             return target_compiler;
         }
 
+        // We prepend this bin directory to the user PATH when linking Rust binaries. To
+        // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
+        let libdir = builder.sysroot_libdir(target_compiler, target_compiler.host);
+        let libdir_bin = libdir.parent().unwrap().join("bin");
+        t!(fs::create_dir_all(&libdir_bin));
+
+        if builder.config.llvm_enabled(target_compiler.host) {
+            let llvm::LlvmResult { llvm_config, .. } =
+                builder.ensure(llvm::Llvm { target: target_compiler.host });
+            if !builder.config.dry_run() && builder.config.llvm_tools_enabled {
+                let llvm_bin_dir =
+                    command(llvm_config).arg("--bindir").run_capture_stdout(builder).stdout();
+                let llvm_bin_dir = Path::new(llvm_bin_dir.trim());
+
+                // Since we've already built the LLVM tools, install them to the sysroot.
+                // This is the equivalent of installing the `llvm-tools-preview` component via
+                // rustup, and lets developers use a locally built toolchain to
+                // build projects that expect llvm tools to be present in the sysroot
+                // (e.g. the `bootimage` crate).
+                for tool in LLVM_TOOLS {
+                    let tool_exe = exe(tool, target_compiler.host);
+                    let src_path = llvm_bin_dir.join(&tool_exe);
+                    // When using `download-ci-llvm`, some of the tools
+                    // may not exist, so skip trying to copy them.
+                    if src_path.exists() {
+                        builder.copy_link(&src_path, &libdir_bin.join(&tool_exe));
+                    }
+                }
+            }
+        }
+
+        let maybe_install_llvm_bitcode_linker = |compiler| {
+            if builder.config.llvm_bitcode_linker_enabled {
+                let src_path = builder.ensure(crate::core::build_steps::tool::LlvmBitcodeLinker {
+                    compiler,
+                    target: target_compiler.host,
+                    extra_features: vec![],
+                });
+                let tool_exe = exe("llvm-bitcode-linker", target_compiler.host);
+                builder.copy_link(&src_path, &libdir_bin.join(tool_exe));
+            }
+        };
+
         // If we're downloading a compiler from CI, we can use the same compiler for all stages other than 0.
         if builder.download_rustc() {
             builder.ensure(Std::new(target_compiler, target_compiler.host));
@@ -1772,6 +1815,9 @@ impl Step for Assemble {
             if target_compiler.stage == builder.top_stage {
                 builder.info(&format!("Creating a sysroot for stage{stage} compiler (use `rustup toolchain link 'name' build/host/stage{stage}`)", stage=target_compiler.stage));
             }
+
+            maybe_install_llvm_bitcode_linker(target_compiler);
+
             return target_compiler;
         }
 
@@ -1880,11 +1926,6 @@ impl Step for Assemble {
 
         copy_codegen_backends_to_sysroot(builder, build_compiler, target_compiler);
 
-        // We prepend this bin directory to the user PATH when linking Rust binaries. To
-        // avoid shadowing the system LLD we rename the LLD we provide to `rust-lld`.
-        let libdir = builder.sysroot_libdir(target_compiler, target_compiler.host);
-        let libdir_bin = libdir.parent().unwrap().join("bin");
-        t!(fs::create_dir_all(&libdir_bin));
         if let Some(lld_install) = lld_install {
             let src_exe = exe("lld", target_compiler.host);
             let dst_exe = exe("rust-lld", target_compiler.host);
@@ -1920,40 +1961,7 @@ impl Step for Assemble {
             );
         }
 
-        if builder.config.llvm_enabled(target_compiler.host) {
-            let llvm::LlvmResult { llvm_config, .. } =
-                builder.ensure(llvm::Llvm { target: target_compiler.host });
-            if !builder.config.dry_run() && builder.config.llvm_tools_enabled {
-                let llvm_bin_dir =
-                    command(llvm_config).arg("--bindir").run_capture_stdout(builder).stdout();
-                let llvm_bin_dir = Path::new(llvm_bin_dir.trim());
-
-                // Since we've already built the LLVM tools, install them to the sysroot.
-                // This is the equivalent of installing the `llvm-tools-preview` component via
-                // rustup, and lets developers use a locally built toolchain to
-                // build projects that expect llvm tools to be present in the sysroot
-                // (e.g. the `bootimage` crate).
-                for tool in LLVM_TOOLS {
-                    let tool_exe = exe(tool, target_compiler.host);
-                    let src_path = llvm_bin_dir.join(&tool_exe);
-                    // When using `download-ci-llvm`, some of the tools
-                    // may not exist, so skip trying to copy them.
-                    if src_path.exists() {
-                        builder.copy_link(&src_path, &libdir_bin.join(&tool_exe));
-                    }
-                }
-            }
-        }
-
-        if builder.config.llvm_bitcode_linker_enabled {
-            let src_path = builder.ensure(crate::core::build_steps::tool::LlvmBitcodeLinker {
-                compiler: build_compiler,
-                target: target_compiler.host,
-                extra_features: vec![],
-            });
-            let tool_exe = exe("llvm-bitcode-linker", target_compiler.host);
-            builder.copy_link(&src_path, &libdir_bin.join(tool_exe));
-        }
+        maybe_install_llvm_bitcode_linker(build_compiler);
 
         // Ensure that `libLLVM.so` ends up in the newly build compiler directory,
         // so that it can be found when the newly built `rustc` is run.