Implement std::path::absolute()

Author: mtilda

src/bootstrap/src/core/builder.rs

@@ -447,19 +447,8 @@ impl StepDescription {
                     return p.clone();
                 }
 
-                #[cfg(windows)]
-                {
-                    if p.is_absolute() {
-                        panic!("Absolute paths are not supported on Windows");
-                    }
-
-                    // Strip current directory prefix if present
-                    return path.strip_prefix(".").unwrap_or(path).to_path_buf();
-                }
-
                 // Make the path absolute, strip the prefix, and convert to a PathBuf.
-                // FIXME: Replace `path.canonicalize()` with `std::path::absolute(path)` to support absolute paths on Windows.
-                match p.canonicalize() {
+                match std::path::absolute(p) {
                     Ok(p) => p.strip_prefix(&builder.src).unwrap_or(&p).to_path_buf(),
                     Err(e) => {
                         eprintln!("ERROR: {:?}", e);