Only copy library dir for stdlib

When building as part of rust, the sysroot source dir is symlinked to
the main source dir, which contains the build dir to which we are likely
copying.

1 files changed, 6 insertions, 1 deletions

diff --git a/build_system/prepare.rs b/build_system/prepare.rs
index 350c3ad8fdc..748d92614b6 100644
--- a/build_system/prepare.rs
+++ b/build_system/prepare.rs
@@ -268,7 +268,12 @@ pub(crate) fn apply_patches(dirs: &Dirs, crate_name: &str, source_dir: &Path, ta
 
     remove_dir_if_exists(target_dir);
     fs::create_dir_all(target_dir).unwrap();
-    copy_dir_recursively(source_dir, target_dir);
+    if crate_name == "stdlib" {
+        fs::create_dir(target_dir.join("library")).unwrap();
+        copy_dir_recursively(&source_dir.join("library"), &target_dir.join("library"));
+    } else {
+        copy_dir_recursively(source_dir, target_dir);
+    }
 
     init_git_repo(target_dir);