Move linker script into SDK crate.

Breaking change to the SDK, so bump the version now.

Author: thejpster

Cargo.toml

@@ -3,7 +3,7 @@ description = "SDK for writing applications for Neotron OS"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 name = "neotron-sdk"
-version = "0.1.0"
+version = "0.2.0"
 authors = ["Jonathan 'theJPster' Pallant <neotron@thejpster.org.uk>"]
 
 [dependencies]

build.rs

@@ -0,0 +1,36 @@
+//! Build script for the Neotron SDK
+//!
+//! Sets up Rust to link with a Cortex-M linker script if you are building for
+//! an Arm bare-metal target.
+
+use std::io::prelude::*;
+
+fn main() {
+    let arch = std::env::var("CARGO_CFG_TARGET_ARCH").expect("CARGO_CFG_TARGET_ARCH variable");
+    let os = std::env::var("CARGO_CFG_TARGET_OS").expect("CARGO_CFG_TARGET_OS variable");
+    match (arch.as_str(), os.as_str()) {
+        ("arm", "none") => {
+            setup_cortexm_linker();
+        }
+        _ => {
+            // no script required
+        }
+    }
+}
+
+fn setup_cortexm_linker() {
+    // Put `neotron-cortex-m.ld` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &std::path::PathBuf::from(std::env::var_os("OUT_DIR").unwrap());
+    std::fs::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/neotron-cortex-m.ld neotron-cortex-m.ldsamples/neotron-cortex-m.ld renamed to neotron-cortex-m.ld

@@ -8,6 +8,9 @@ members = [
 ]
 resolver = "2"
 
+[workspace.dependencies]
+neotron-sdk = { path = "..", version = "0.2" }
+
 [profile.release]
 opt-level = "z"
 lto = "fat"

samples/Cargo.toml

@@ -19,6 +19,6 @@ arm-none-eabi-gcc \
     -nostartfiles \
     -ffreestanding \
     -mcpu=$CPU \
-    -Wl,-T../neotron-cortex-m.ld \
+    -Wl,-T../../neotron-cortex-m.ld \
     -o asmhello.elf \
     asmhello.S \

samples/asmhello/build.sh

@@ -28,7 +28,7 @@ arm-none-eabi-gcc \
     -Wdouble-promotion \
     -Wextra \
     -Wl,-gc-sections \
-    -Wl,-T../neotron-cortex-m.ld \
+    -Wl,-T../../neotron-cortex-m.ld \
     -Wshadow \
     --specs=nano.specs \
     --specs=nosys.specs \

samples/chello/build.sh

@@ -7,6 +7,6 @@ authors = ["Jonathan 'theJPster' Pallant <neotron@thejpster.org.uk>"]
 description = "Hello World for Neotron systems"
 
 [dependencies]
-neotron-sdk = { path = "../.." }
+neotron-sdk = { workspace = true }
 
 # See workspace for profile settings

samples/fault/Cargo.toml

@@ -7,6 +7,6 @@ authors = ["Jonathan 'theJPster' Pallant <neotron@thejpster.org.uk>"]
 description = "Hello World for Neotron systems"
 
 [dependencies]
-neotron-sdk = { path = "../.." }
+neotron-sdk = { workspace = true }
 
 # See workspace for profile settings