[WIP] Attempt to debug failures with cygwin CI

For some reason it is not easy to replicate the cygwin failures pointed out
by the CI in the local environment, this commit just adds some extra
debugging statements so we can have more information about the problem

setuptools/config/expand.py

@@ -243,17 +243,29 @@ def find_packages(*, namespaces=False, root_dir=None, **kwargs):
     where = kwargs.pop('where', ['.'])
     if isinstance(where, str):
         where = [where]
-    target = (_nest_url_style_path(root_dir, path) for path in where)
+    target = [_nest_url_style_path(root_dir, path) for path in where]
+    from distutils import log
+    log.warn(f"find_packages cwd={os.getcwd()!r} root_dir={root_dir!r}")
+    for p in target:
+        log.warn(f"find_packages where={p!r} {kwargs!r}")
     return list(chain_iter(PackageFinder.find(x, **kwargs) for x in target))
 
 
 def _nest_url_style_path(parent, path):
+    from distutils import log
+
+    log.warn(f"_nest_url_style_path parent={parent!r} path={path!r}")
+
     path = parent if path == "." else os.path.join(parent, path)
     return _url_style_path(path)
 
 
 def _url_style_path(path):
-    return "/".join(Path(os.path.normpath(path)).parts) or "."
+    from distutils import log
+
+    parts = Path(os.path.normpath(path)).parts
+    log.warn(f"_url_style_path parts={parts!r}")
+    return "/".join(parts) or "."
 
 
 def version(value):