Add build.rs to detect armv6

embassy-boot/stm32/build.rs

@@ -0,0 +1,11 @@
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    let target = env::var("TARGET").unwrap();
+    if target.starts_with("thumbv6m-") {
+        println!("cargo:rustc-cfg=armv6m");
+    }
+}

examples/boot/bootloader/stm32/build.rs

@@ -24,9 +24,4 @@ fn main() {
     if env::var("CARGO_FEATURE_DEFMT").is_ok() {
         println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
     }
-
-    let target = env::var("TARGET").unwrap();
-    if target.starts_with("thumbv6m-") {
-        println!("cargo:rustc-cfg=armv6m");
-    }
 }