fn main() {
    let arch = std::env::var("LBOS_ARCH").unwrap_or("virt".to_string());
    println!("cargo:rerun-if-env-changed=LBOS_ARCH");
    println!("cargo:rustc-cfg=feature=\"arch_{}\"", arch);

    println!("cargo:rerun-if-changed=src/arch/{}/asm", arch);

    if arch == "ppc32" {
        let mut cc_build = cc::Build::new();
        let cc_build = cc_build
            .file(format!("src/arch/{}/asm/realmode.S", arch))
            .file(format!("src/arch/{}/asm/trap.S", arch));

        match &arch[..] {
            "ppc32" => {
                cc_build
                    .flag("-mcpu=powerpc")
                    .flag("-m32")
                    .flag("-nostdlib")
                    .flag("-msoft-float");
            },
            _ => panic!("unknown architecture: {}", arch),
        }

        cc_build.compile("vap_asm");

        // link to the assembly file
        println!("cargo:rustc-link-lib=static=vap_asm");
    }

    // specify the linker.ld script
    println!("cargo:rustc-link-arg=-Tsrc/arch/{arch}/asm/linker.ld");
}