Get sample to build using linker script.

Author: thejpster

samples/hello/.cargo/config.toml samples/.cargo/config.tomlsamples/hello/.cargo/config.toml renamed to samples/.cargo/config.toml

@@ -0,0 +1,21 @@
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    // Put `neotron-cortex-m.ld` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("neotron-cortex-m.ld"))
+        .unwrap()
+        .write_all(include_bytes!("../neotron-cortex-m.ld"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // By default, Cargo will re-run a build script whenever
+    // any file in the project changes. By specifying `neotron-cortex-m.ld`
+    // here, we ensure the build script is only re-run when
+    // `neotron-cortex-m.ld` is changed.
+    println!("cargo:rerun-if-changed=neotron-cortex-m.ld");
+}

samples/hello/build.rs

@@ -4,7 +4,7 @@
 extern crate neotron_sdk;
 
 #[no_mangle]
-extern "C" fn main() -> i32 {
+extern "C" fn neotron_main() -> i32 {
     let stdout = neotron_sdk::stdout();
     stdout.write(b"Hello, world\n").unwrap();
     0