Replace rustflags with build.rs extra-link-args.

Rustflags apply to ALL the crates in the graph, while we only need
them for the toplevel crate which is the only one getting linked.

Rustflags are not equal for all crates, this caused cargo to re-build the
same dependency crate multiple times uselessly. After this change, deps
are reused more, making builds faster.

Note that this only applies when sharing the target/ dir for multiple crates
in the repo which is not the default.

2 files changed, 4 insertions, 12 deletions

diff --git a/examples/nrf/.cargo/config.toml b/examples/nrf/.cargo/config.toml
index 0151d1ed5..c75b5c539 100644
--- a/examples/nrf/.cargo/config.toml
+++ b/examples/nrf/.cargo/config.toml
@@ -2,17 +2,5 @@
 # replace nRF82840_xxAA with your chip as listed in `probe-run --list-chips`
 runner = "probe-run --chip nRF52840_xxAA"
 
-rustflags = [
-  # LLD (shipped with the Rust toolchain) is used as the default linker
-  "-C", "link-arg=--nmagic",
-  "-C", "link-arg=-Tlink.x",
-  "-C", "link-arg=-Tdefmt.x",
-
-  # Code-size optimizations.
-  "-Z", "trap-unreachable=no",
-  "-C", "inline-threshold=5",
-  "-C", "no-vectorize-loops",
-]
-
 [build]
 target = "thumbv7em-none-eabi"
diff --git a/examples/nrf/build.rs b/examples/nrf/build.rs
index d534cc3df..30691aa97 100644
--- a/examples/nrf/build.rs
+++ b/examples/nrf/build.rs
@@ -28,4 +28,8 @@ fn main() {
     // here, we ensure the build script is only re-run when
     // `memory.x` is changed.
     println!("cargo:rerun-if-changed=memory.x");
+
+    println!("cargo:rustc-link-arg-bins=--nmagic");
+    println!("cargo:rustc-link-arg-bins=-Tlink.x");
+    println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
 }