c64 0.1.0-alpha.1

Driver for the Commodore 64 platform
Documentation 
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fn main() {
    // `#[cfg]` in `build.rs` evaluates against the host (the machine running
    // the build script), not the Cargo target being built. To gate behaviour
    // on the target, inspect the `TARGET` env var that Cargo sets for us.
    // The C wrappers contain 6502 inline assembly that only `mos-c64-clang`
    // can compile, so we skip cc entirely on any other target (e.g. when
    // running `cargo test` against the host triple).
    let target = std::env::var("TARGET").expect("cargo always sets TARGET");
    if target == "mos-c64-none" {
        build_c();
    }
}

fn build_c() {
    cc::Build::new()
        .compiler("mos-c64-clang")
        .file("src/pac/basic.c")
        .file("src/pac/irq.c")
        .file("src/pac/kernal.c")
        .file("src/pac/register.c")
        .compile("asm");

    println!("cargo:rerun-if-changed=src/pac/basic.c");
    println!("cargo:rerun-if-changed=src/pac/irq.c");
    println!("cargo:rerun-if-changed=src/pac/kernal.c");
    println!("cargo:rerun-if-changed=src/pac/register.c");
}