python311Packages.python-zbar: fix build since Py_SIZE is turned into a function

Python 3.11 turned Py_SIZE into a function, thus Py_SIZE(obj) will be a rvalue,
we need to use Py_SET_SIZE to set size now.

pkgs/development/python-modules/python-zbar/0001-python-enum-fix-build-for-Python-3.11.patch

@@ -0,0 +1,61 @@
+From 64de7911d2938fc3601fec39c08008465b9d4f6f Mon Sep 17 00:00:00 2001
+From: Nick Cao <nickcao@nichi.co>
+Date: Tue, 7 Feb 2023 17:12:50 +0800
+Subject: [PATCH] python: enum: fix build for Python 3.11
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Python 3.9 introduced Py_SET_SIZE function to set size instead of
+relying on Py_SIZE() as a macro [3.9].
+
+Python 3.10 started to encourage to use Py_SET_SIZE instead of
+assigning into return value of Py_SIZE [3.10].
+
+Python 3.11 flips the switch, turn Py_SIZE into a function [3.11],
+thus Py_SIZE(obj) will be a rvalue. We need to use Py_SET_SIZE
+to set size now.
+
+[3.9]: https://docs.python.org/3.9/c-api/structures.html#c.Py_SET_SIZE
+[3.10]: https://docs.python.org/3.10/c-api/structures.html#c.Py_SIZE
+[3.11]: https://docs.python.org/3.11/c-api/structures.html#c.Py_SIZE
+
+Adapted from https://github.com/mchehab/zbar/pull/231
+
+Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
+Signed-off-by: Nick Cao <nickcao@nichi.co>
+---
+ python/enum.c | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/python/enum.c b/python/enum.c
+index dfe1b1e..4833a20 100644
+--- a/python/enum.c
++++ b/python/enum.c
+@@ -52,7 +52,11 @@ enumitem_new (PyTypeObject *type,
+ 
+     /* we assume the "fast path" for a single-digit ints (see longobject.c) */
+     /* this also holds if we get a small_int preallocated long */
++#if PY_VERSION_HEX >= 0x030900A4
++    Py_SET_SIZE(&self->val, Py_SIZE(longval));
++#else
+     Py_SIZE(&self->val) = Py_SIZE(longval);
++#endif
+     self->val.ob_digit[0] = longval->ob_digit[0];
+     Py_DECREF(longval);
+ #else
+@@ -143,7 +147,11 @@ zbarEnumItem_New (PyObject *byname,
+ 
+     /* we assume the "fast path" for a single-digit ints (see longobject.c) */
+     /* this also holds if we get a small_int preallocated long */
++#if PY_VERSION_HEX >= 0x030900A4
++    Py_SET_SIZE(&self->val, Py_SIZE(longval));
++#else
+     Py_SIZE(&self->val) = Py_SIZE(longval);
++#endif
+     self->val.ob_digit[0] = longval->ob_digit[0];
+     Py_DECREF(longval);
+ 
+-- 
+2.39.1
+

pkgs/development/python-modules/python-zbar/default.nix

@@ -1,4 +1,10 @@
-{ lib , buildPythonPackage , fetchFromGitHub , pillow , zbar , pytestCheckHook }:
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, pillow
+, zbar
+, pytestCheckHook
+}:
 
 buildPythonPackage rec {
   pname = "python-zbar";
@@ -12,6 +18,13 @@ buildPythonPackage rec {
     sha256 = "sha256-FvV7TMc4JbOiRjWLka0IhtpGGqGm5fis7h870OmJw2U=";
   };
 
+  patches = [
+    # python: enum: fix build for Python 3.11
+    # https://github.com/mchehab/zbar/pull/231
+    # the patch is reworked as it does not cleanly apply
+    ./0001-python-enum-fix-build-for-Python-3.11.patch
+  ];
+
   propagatedBuildInputs = [ pillow ];
 
   buildInputs = [ zbar ];