1 files changed, 22 insertions, 0 deletions
diff --git a/rtic-monotonics/build.rs b/rtic-monotonics/build.rs
new file mode 100644
index 00000000..a2ed5707
--- /dev/null
+++ b/rtic-monotonics/build.rs
@@ -0,0 +1,22 @@
+fn main() {
+    // feature=["stm32g081kb"] etc.
+    let stm32_chip: Vec<_> = std::env::vars()
+        .map(|(a, _)| a)
+        .filter(|x| {
+            !x.starts_with("CARGO_FEATURE_STM32_METAPAC")
+                && !x.starts_with("CARGO_FEATURE_STM32_TIM")
+                && x.starts_with("CARGO_FEATURE_STM32")
+        })
+        .collect();
+
+    match stm32_chip.len() {
+        0 => {
+            // Not using stm32.
+        }
+        1 => {
+            // Allows to just use #[cfg(stm32)] if one of the stm32 chips is used.
+            println!("cargo:rustc-cfg=stm32");
+        }
+        _ => panic!("multiple stm32xx definitions {:?}", stm32_chip),
+    }
+}