Move link-arg setting from .cargo/config.toml to build.rs to make it less easy to forget about

build.rs

@@ -7,6 +7,8 @@
 //! Cargo re-run the build script whenever `memory.x` is changed,
 //! updating `memory.x` ensures a rebuild of the application with the
 //! new memory settings.
+//!
+//! The build script also sets the linker flags to tell it which link script to use.
 
 use std::env;
 use std::fs::File;
@@ -28,4 +30,14 @@ fn main() {
     // here, we ensure the build script is only re-run when
     // `memory.x` is changed.
     println!("cargo:rerun-if-changed=memory.x");
+
+    // Specify linker arguments.
+
+    // `--nmagic` is required if memory section addresses are not aligned to 0x10000,
+    // for example the FLASH and RAM sections in your `memory.x`.
+    // See https://github.com/rust-embedded/cortex-m-quickstart/pull/95
+    println!("cargo:rustc-link-arg=--nmagic");
+
+    // Set the linker script to the one provided by cortex-m-rt.
+    println!("cargo:rustc-link-arg=-Tlink.x");
 }