From 78e88c2e81d4be363c1152d16df6a631c9d02521 Mon Sep 17 00:00:00 2001
From: Eugene Rossokha <hsugeneyos@gmail.com>
Date: Mon, 17 Mar 2025 19:47:15 +0200
Subject: [PATCH] Restrict the target to .freestanding/.none/supported cpu

---
 build.zig | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/build.zig b/build.zig
index 9c3835c..423c0f9 100644
--- a/build.zig
+++ b/build.zig
@@ -46,13 +46,29 @@ fn insertFakeLinuxImageHeader(step: *std.Build.Step, opts: std.Build.Step.MakeOp
     _ = opts;
 }
 
+pub const SupportedArchitecture = enum {
+    riscv64,
+
+    pub fn toTargetCpuArch(self: @This()) std.Target.Cpu.Arch {
+        return switch (self) {
+            .riscv64 => .riscv64,
+        };
+    }
+};
+
 pub fn build(b: *std.Build) anyerror!void {
     const optimize = b.standardOptimizeOption(.{ .preferred_optimize_mode = .ReleaseFast });
-    const target = b.standardTargetOptions(.{ .default_target = .{
-        .cpu_arch = .riscv64,
+
+    const cpu_arch = (b.option(
+        SupportedArchitecture,
+        "cpu_arch",
+        "Specify the cpu architecture",
+    ) orelse SupportedArchitecture.riscv64).toTargetCpuArch();
+    const target = b.resolveTargetQuery(.{
+        .cpu_arch = cpu_arch,
         .os_tag = .freestanding,
         .abi = .none,
-    } });
+    });
 
     const kernel_module = b.addModule("kernel", .{ .optimize = optimize, .target = target, .pic = true, .red_zone = false, .code_model = .medium, .root_source_file = b.path("src/kernel.zig") });
 
-- 
2.53.0