More debugging

cargo/cargo_build_script_runner/bin.rs

@@ -32,10 +32,13 @@ fn run_buildrs() -> Result<(), String> {
     // directory - resolving these may cause tools which inspect $0, or try to resolve files
     // relative to themselves, to fail.
     let exec_root = env::current_dir().expect("Failed to get current directory");
-    visit_dirs(&exec_root).expect("Error walking dirs");
+    if let Err(err) = visit_dirs(&exec_root) {
+        eprintln!("DWH: Error from visit_dirs: {:?}", err);
+    }
     let manifest_dir_env = env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR was not set");
     let rustc_env = env::var("RUSTC").expect("RUSTC was not set");
     let manifest_dir = exec_root.join(&manifest_dir_env);
+    eprintln!("DWH: Running in manifest_dir: {}", manifest_dir.display());
     let rustc = exec_root.join(&rustc_env);
     let Options {
         progname,
@@ -279,14 +282,15 @@ fn main() {
 }
 
 fn visit_dirs(dir: &Path) -> std::io::Result<()> {
+    eprintln!("DWH: Visiting dir {}", dir.display());
     if dir.is_dir() {
         for entry in std::fs::read_dir(dir)? {
             let entry = entry?;
             let path = entry.path();
             if path.is_dir() {
                 visit_dirs(&path)?;
             } else {
-                println!("{}", dir.join(path).display());
+                eprintln!("DWH: {}", path.display());
             }
         }
     }