Add ARM GCC include dirs

Author: leftger

stm32-bindings-gen/src/lib.rs

@@ -270,6 +270,10 @@ impl Gen {
             builder = builder.clang_arg(*arg);
         }
 
+        for arg in arm_sysroot_args() {
+            builder = builder.clang_arg(arg);
+        }
+
         if !spec.allowlist.is_empty() {
             for pattern in spec.allowlist {
                 builder = builder
@@ -394,3 +398,24 @@ impl Gen {
         triple.trim().to_ascii_lowercase().starts_with("thumb")
     }
 }
+
+fn arm_sysroot_args() -> Vec<String> {
+    if let Ok(output) = Command::new("arm-none-eabi-gcc")
+        .arg("-print-sysroot")
+        .output()
+    {
+        if output.status.success() {
+            if let Ok(path) = String::from_utf8(output.stdout) {
+                let trimmed = path.trim();
+                if !trimmed.is_empty() {
+                    return vec![
+                        format!("--sysroot={trimmed}"),
+                        format!("-I{trimmed}/include"),
+                        format!("-I{trimmed}/include/c++/11.2.1"), // adjust compiler version if needed
+                    ];
+                }
+            }
+        }
+    }
+    Vec::new()
+}