mmu: first attempt to get it enabled

Signed-off-by: Sean Cross <sean@xobs.io>

build.rs

@@ -6,6 +6,18 @@ use std::path::PathBuf;
 
 fn main() {
     let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
+    let target = env::var("TARGET").unwrap();
+    let name = env::var("CARGO_PKG_NAME").unwrap();
+
+    if target.starts_with("riscv") {
+        fs::copy(
+            format!("bin/{}.a", target),
+            out_dir.join(format!("lib{}.a", name)),
+        ).unwrap();
+
+        println!("cargo:rustc-link-lib=static={}", name);
+        println!("cargo:rustc-link-search={}", out_dir.display());
+    }
 
     // Put the linker script somewhere the linker can find it
     fs::File::create(out_dir.join("memory.x"))