From becf664e4930ce59fb01905e4c6af38c2df5382e 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: Wed, 9 Oct 2024 18:52:28 +0800
Subject: [PATCH] Match std RUSTFLAGS for host and target for `mir-opt` test

---
 src/bootstrap/src/core/build_steps/test.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/bootstrap/src/core/build_steps/test.rs b/src/bootstrap/src/core/build_steps/test.rs
index 7a49b68b91e65..5bf4f19b3c417 100644
--- a/src/bootstrap/src/core/build_steps/test.rs
+++ b/src/bootstrap/src/core/build_steps/test.rs
@@ -1697,7 +1697,11 @@ NOTE: if you're sure you want to do this, please open an issue as to why. In the
         builder.ensure(TestHelpers { target: compiler.host });
 
         // ensure that `libproc_macro` is available on the host.
-        builder.ensure(compile::Std::new(compiler, compiler.host));
+        if suite == "mir-opt" {
+            builder.ensure(compile::Std::new_for_mir_opt_tests(compiler, compiler.host));
+        } else {
+            builder.ensure(compile::Std::new(compiler, compiler.host));
+        }
 
         // As well as the target
         if suite != "mir-opt" {