Setuptools symlinks

setup.py

@@ -1,3 +1,3 @@
 # Copyright (c) Meta Platforms, Inc. and affiliates.
 # Copyright 2024 Arm Limited and/or its affiliates.
 # All rights reserved.
@@ -550,6 +550,21 @@
     a file to a different relative location under the output package directory.
     """
 
+    def analyze_manifest(self):
+        super().analyze_manifest()
+        # Recent versions of setuptools may include bare directory symlinks from version
+        # control (e.g. src/executorch/{backends,codegen,data,...} ->
+        # ../../<name>) in manifest_files. These exist for editable mode but
+        # break regular installs: build_package_data passes them to copy_file,
+        # which calls os.path.isfile() and gets False for a symlink-to-directory.
+        if not self.editable_mode:
+            _root = os.path.dirname(os.path.abspath(__file__))
+            for _pkg in list(self.manifest_files):
+                self.manifest_files[_pkg] = [
+                    _f for _f in self.manifest_files[_pkg]
+                    if os.path.isfile(os.path.join(_root, _f))
+                ]
+
     def run(self):
         # Copy python files to the output directory. This set of files is
         # defined by the py_module list and package_data patterns.