From d91b8aa688b86f05d1c2c60b985edafdc1e54e17 Mon Sep 17 00:00:00 2001
From: Philipp Oppermann <dev@phil-opp.com>
Date: Thu, 27 Nov 2025 13:18:04 +0100
Subject: [PATCH] Use legacy symbol mangling for BIOS stage 2

---
 build.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/build.rs b/build.rs
index c83c6145..84663244 100644
--- a/build.rs
+++ b/build.rs
@@ -215,6 +215,10 @@ fn build_bios_stage_2() -> PathBuf {
     cmd.env_remove("RUSTFLAGS");
     cmd.env_remove("CARGO_ENCODED_RUSTFLAGS");
     cmd.env_remove("RUSTC_WORKSPACE_WRAPPER"); // used by clippy
+    cmd.env(
+        "RUSTFLAGS",
+        "-Csymbol-mangling-version=legacy -Zunstable-options",
+    );
     let status = cmd
         .status()
         .expect("failed to run cargo install for bios second stage");