tiny_os/build.rs

fn main() {
    println!("cargo:rerun-if-changed=build.rs");

    struct TargetConfig {
        target: &'static str,
        lds:    &'static str,
    }

    const TARGET_LDS: &[TargetConfig] = &[
        TargetConfig {
            target: "riscv64",
            lds:    "src/arch/riscv/linker.ld",
        },
        TargetConfig {
            target: "riscv32",
            lds:    "src/arch/riscv/linker.ld",
        },
    ];

    let target = std::env::var("TARGET").unwrap();
    for cfg in TARGET_LDS {
        if target.starts_with(cfg.target) {
            println!("cargo:rerun-if-changed={}", cfg.lds);
            println!("cargo:rustc-link-arg=-T{}", cfg.lds);
            return;
        }
    }

    panic!("Unsupported target: {}", target);
}