From a39e96407a579abbf4c273dc41692b69717b2aa8 Mon Sep 17 00:00:00 2001
From: lzutao <taolzu@gmail.com>
Date: Sat, 21 Mar 2020 21:54:01 +0700
Subject: [PATCH] Remove CARGO_BUILD_TARGET from bootstrap.py

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

diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index 50e1726240fff..d5efed61b541e 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -664,6 +664,10 @@ def build_bootstrap(self):
         if self.clean and os.path.exists(build_dir):
             shutil.rmtree(build_dir)
         env = os.environ.copy()
+        # `CARGO_BUILD_TARGET` breaks bootstrap build.
+        # See also: <https://github.com/rust-lang/rust/issues/70208>.
+        if "CARGO_BUILD_TARGET" in env:
+            del env["CARGO_BUILD_TARGET"]
         env["RUSTC_BOOTSTRAP"] = '1'
         env["CARGO_TARGET_DIR"] = build_dir
         env["RUSTC"] = self.rustc()