Use unique checkouts

build_docs.py

@@ -630,7 +630,7 @@ def run(self, http: urllib3.PoolManager) -> bool:
     @property
     def checkout(self) -> Path:
         """Path to CPython git clone."""
-        return self.build_root / "cpython"
+        return self.build_root / _checkout_name(self.select_output)
 
     def clone_translation(self):
         self.translation_repo.update()
@@ -1129,7 +1129,8 @@ def build_docs(args) -> bool:
     del args.languages
     all_built_successfully = True
     cpython_repo = Repository(
-        "https://github.com/python/cpython.git", args.build_root / "cpython"
+        "https://github.com/python/cpython.git",
+        args.build_root / _checkout_name(args.select_output),
     )
     while todo:
         version, language = todo.pop()
@@ -1184,6 +1185,12 @@ def build_docs(args) -> bool:
     return all_built_successfully
 
 
+def _checkout_name(select_output: str | None) -> str:
+    if select_output is not None:
+        return f"cpython-{select_output}"
+    return "cpython"
+
+
 def main():
     """Script entry point."""
     args = parse_args()