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, 5 insertions, 12 deletions

diff --git a/examples/stm32u5/.cargo/config.toml b/examples/stm32u5/.cargo/config.toml
index 7f488700..ba3ef1dc 100644
--- a/examples/stm32u5/.cargo/config.toml
+++ b/examples/stm32u5/.cargo/config.toml
@@ -2,17 +2,5 @@
 # replace STM32F429ZITx with your chip as listed in `probe-run --list-chips`
 runner = "probe-run --chip STM32U585AIIx"
 
-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/stm32u5/build.rs b/examples/stm32u5/build.rs
new file mode 100644
index 00000000..8cd32d7e
--- /dev/null
+++ b/examples/stm32u5/build.rs
@@ -0,0 +1,5 @@
+fn main() {
+    println!("cargo:rustc-link-arg-bins=--nmagic");
+    println!("cargo:rustc-link-arg-bins=-Tlink.x");
+    println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
+}