From e1e736b2a3fb1322a34387d251aa1a78f81be78b Mon Sep 17 00:00:00 2001
From: Nilstrieb <48135649+Nilstrieb@users.noreply.github.com>
Date: Thu, 28 Jul 2022 21:40:33 +0200
Subject: [PATCH] Clone the `src/llvm-project` submodule if profiling is
 enabled

To compile rustc with profiling information, `compiler-rt` from
LLVM is required. Building it requires the `src/llvm-project` submodule
to be initialized and updated.
---
 src/bootstrap/compile.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/bootstrap/compile.rs b/src/bootstrap/compile.rs
index aa7cda46bda..dd2b9d59366 100644
--- a/src/bootstrap/compile.rs
+++ b/src/bootstrap/compile.rs
@@ -111,6 +111,11 @@ impl Step for Std {
 
         builder.update_submodule(&Path::new("library").join("stdarch"));
 
+        // Profiler information requires LLVM's compiler-rt
+        if builder.config.profiler {
+            builder.update_submodule(&Path::new("src/llvm-project"));
+        }
+
         let mut target_deps = builder.ensure(StartupObjects { compiler, target });
 
         let compiler_to_use = builder.compiler_for(compiler.stage, compiler.host, target);