From 3cc7ed909caf6e59f925753016dfe5c53520088a Mon Sep 17 00:00:00 2001
From: Red Bear OS <build@redbearos.org>
Date: Sun, 28 Jun 2026 04:40:40 +0300
Subject: [PATCH] bios: add -Zunstable-options for custom JSON target spec

Rust nightly requires -Zunstable-options for custom target JSON specs
(such as x86-unknown-none.json). Without it, the build fails with:
  error: error loading target specification: custom targets are
  unstable and require `-Zunstable-options`

UEFI already uses the built-in x86_64-unknown-uefi target, so it
didn't need this flag. The kernel recipe already has this fix; the
bootloader BIOS Makefile was missing it.
---
 mk/x86-unknown-none.mk | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mk/x86-unknown-none.mk b/mk/x86-unknown-none.mk
index 16e949de93..7071d8738b 100644
--- a/mk/x86-unknown-none.mk
+++ b/mk/x86-unknown-none.mk
@@ -7,7 +7,7 @@ all: $(BUILD)/bootloader.bin
 
 $(BUILD)/libbootloader.a: $(SOURCE)/Cargo.toml $(SOURCE)/Cargo.lock $(shell find $(SOURCE)/src -type f)
 	mkdir -p "$(BUILD)"
-	env RUSTFLAGS="--cfg aes_force_soft" \
+	env RUSTFLAGS="--cfg aes_force_soft -Zunstable-options" \
 	cargo rustc \
 		--manifest-path="$<" \
 		-Z build-std=core,alloc \
@@ -20,7 +20,7 @@ $(BUILD)/libbootloader.a: $(SOURCE)/Cargo.toml $(SOURCE)/Cargo.lock $(shell find
 
 $(BUILD)/libbootloader-live.a: $(SOURCE)/Cargo.toml $(SOURCE)/Cargo.lock $(shell find $(SOURCE)/src -type f)
 	mkdir -p "$(BUILD)"
-	env RUSTFLAGS="--cfg aes_force_soft" \
+	env RUSTFLAGS="--cfg aes_force_soft -Zunstable-options" \
 	cargo rustc \
 		--manifest-path="$<" \
 		-Z build-std=core,alloc \