gh-153903: Fix ctypes wrap_dll_function() with string annotations (#154042)

https://github.com/python/cpython/commit/d5eb31209699ef59857780a5530191031ee3f796
commit: d5eb31209699ef59857780a5530191031ee3f796
branch: main
author: Victor Stinner <[email protected]>
committer: vstinner <[email protected]>
date: 2026-07-19T12:04:40+02:00
summary:

gh-153903: Fix ctypes wrap_dll_function() with string annotations (#154042)

Call get_annotations() with eval_str=True.

files:
A Lib/test/test_ctypes/wrap_str_ann.py
M Lib/ctypes/util.py
M Lib/test/test_ctypes/test_funcptr.py

diff --git a/Lib/ctypes/util.py b/Lib/ctypes/util.py
index b035bfb99feee0..c65fc3032fdfad 100644
--- a/Lib/ctypes/util.py
+++ b/Lib/ctypes/util.py
@@ -579,7 +579,7 @@ def wrap_dll_function(dll):
     def decorator(func):
         name = func.__name__
         ptr = getattr(dll, name)
-        annotations = annotationlib.get_annotations(func)
+        annotations = annotationlib.get_annotations(func, eval_str=True)
 
         try:
             restype = annotations.pop("return")
diff --git a/Lib/test/test_ctypes/test_funcptr.py b/Lib/test/test_ctypes/test_funcptr.py
index 94d03ad553d222..86699ad8109827 100644
--- a/Lib/test/test_ctypes/test_funcptr.py
+++ b/Lib/test/test_ctypes/test_funcptr.py
@@ -151,6 +151,11 @@ def noexist():
             def PyObject_GetAttrString(op: ctypes.py_object, attr: ctypes.c_char_p):
                 pass
 
+    def test_wrap_dll_function_str_ann(self):
+        from test.test_ctypes import wrap_str_ann
+        version = wrap_str_ann.Py_GetVersion()
+        self.assertIsInstance(version, bytes)
+
 
 if __name__ == '__main__':
     unittest.main()
diff --git a/Lib/test/test_ctypes/wrap_str_ann.py b/Lib/test/test_ctypes/wrap_str_ann.py
new file mode 100644
index 00000000000000..aa114a640c3a99
--- /dev/null
+++ b/Lib/test/test_ctypes/wrap_str_ann.py
@@ -0,0 +1,13 @@
+from __future__ import annotations
+import ctypes.util
+
+def test_ann() -> ctypes.c_char_p:
+    ...
+
+# Check that "from __future__ import annotations" works as expected
+if not isinstance(test_ann.__annotations__['return'], str):
+    raise Exception("annotations must be strings")
+
[email protected]_dll_function(ctypes.pythonapi)
+def Py_GetVersion() -> ctypes.c_char_p:
+    ...

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