Fix C++17 error: standard attributes in middle of decl-specifiers (CYTHON_UNUSED)

This is only relevant on Python 3.13+

Fixes (part of) https://bugzilla.redhat.com/2247486

5791.patch

@@ -0,0 +1,35 @@
+From add379d9df149149e3718bd8f71945b7d02fcf4e Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Miro=20Hron=C4=8Dok?= <miro@hroncok.cz>
+Date: Wed, 1 Nov 2023 21:32:40 +0100
+Subject: [PATCH] Fix C++17 error: standard attributes in middle of
+ decl-specifiers (CYTHON_UNUSED)
+
+This is only relevant on Python 3.13+
+
+Fixes https://github.com/cython/cython/issues/5790
+---
+ Cython/Utility/FunctionArguments.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/Cython/Utility/FunctionArguments.c b/Cython/Utility/FunctionArguments.c
+index 5050a094a88..0dc89c638ab 100644
+--- a/Cython/Utility/FunctionArguments.c
++++ b/Cython/Utility/FunctionArguments.c
+@@ -505,7 +505,7 @@ static int __Pyx_MergeKeywords(PyObject *kwdict, PyObject *source_mapping) {
+     #define __Pyx_KwValues_FASTCALL(args, nargs) ((args) + (nargs))
+     static CYTHON_INLINE PyObject * __Pyx_GetKwValue_FASTCALL(PyObject *kwnames, PyObject *const *kwvalues, PyObject *s);
+ #if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x030d0000
+-    static CYTHON_UNUSED PyObject *__Pyx_KwargsAsDict_FASTCALL(PyObject *kwnames, PyObject *const *kwvalues);/*proto*/
++    CYTHON_UNUSED static PyObject *__Pyx_KwargsAsDict_FASTCALL(PyObject *kwnames, PyObject *const *kwvalues);/*proto*/
+   #else
+     #define __Pyx_KwargsAsDict_FASTCALL(kw, kwvalues) _PyStack_AsDict(kwvalues, kw)
+   #endif
+@@ -563,7 +563,7 @@ static CYTHON_INLINE PyObject * __Pyx_GetKwValue_FASTCALL(PyObject *kwnames, PyO
+ }
+ 
+ #if CYTHON_COMPILING_IN_CPYTHON && PY_VERSION_HEX >= 0x030d0000
+-static CYTHON_UNUSED PyObject *__Pyx_KwargsAsDict_FASTCALL(PyObject *kwnames, PyObject *const *kwvalues) {
++CYTHON_UNUSED static PyObject *__Pyx_KwargsAsDict_FASTCALL(PyObject *kwnames, PyObject *const *kwvalues) {
+     Py_ssize_t i, nkwargs = PyTuple_GET_SIZE(kwnames);
+     PyObject *dict;
+ 

Cython.spec

@@ -13,6 +13,10 @@ License:        Apache-2.0
 URL:            http://www.cython.org
 Source:         https://github.com/cython/cython/archive/%{version}/Cython-%{version}.tar.gz
 
+# Fix C++17 error: standard attributes in middle of decl-specifiers (CYTHON_UNUSED)
+# This is only relevant on Python 3.13+
+Patch:          https://github.com/cython/cython/pull/5791.patch
+
 BuildRequires:  python3-devel
 
 %if %{with tests}