1 files changed, 17 insertions, 2 deletions

diff --git a/embassy-time/build.rs b/embassy-time/build.rs
index 5b0095661..78bd27ec7 100644
--- a/embassy-time/build.rs
+++ b/embassy-time/build.rs
@@ -1,3 +1,18 @@
-// empty, needed to be able to use `links` in Cargo.toml.
+use std::env;
+use std::ffi::OsString;
+use std::process::Command;
 
-fn main() {}
+fn main() {
+    println!("cargo:rerun-if-changed=build.rs");
+
+    let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
+
+    let output = Command::new(rustc)
+        .arg("--version")
+        .output()
+        .expect("failed to run `rustc --version`");
+
+    if String::from_utf8_lossy(&output.stdout).contains("nightly") {
+        println!("cargo:rustc-cfg=nightly");
+    }
+}