From a4b9aa3e6e46bdf0674b64940eaf89498fa46223 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=AE=B8=E6=9D=B0=E5=8F=8B=20Jieyou=20Xu=20=28Joe=29?=
 <39484203+jieyouxu@users.noreply.github.com>
Date: Sun, 12 Jan 2025 11:43:06 +0800
Subject: [PATCH] bootstrap.py: build bootstrap binary with
 `--features=tracing` if `BOOTSTRAP_TRACING` env var is set

---
 src/bootstrap/bootstrap.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index 89415afbe3bc..76ee40c6f45f 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -1129,6 +1129,10 @@ class RustBuild(object):
             "-Zroot-dir=" + self.rust_root,
         ]
         args.extend("--verbose" for _ in range(self.verbose))
+
+        if "BOOTSTRAP_TRACING" in env:
+            args.append("--features=tracing")
+
         if self.use_locked_deps:
             args.append("--locked")
         if self.use_vendored_sources: