Fix build with Cython 3

731.patch

@@ -0,0 +1,39 @@
+From 17dc5b6cd96dcfe64fd71789c771ca9b96d260e5 Mon Sep 17 00:00:00 2001
+From: "Andrew J. Hesford" <ajh@sideband.org>
+Date: Fri, 21 Jul 2023 09:50:00 -0400
+Subject: [PATCH] Fix builds with Cython 3
+
+This is a *de minimis* fix for building with Cython 3. Recent Cython<3
+releases provided `Cython.Distutils.build_ext` as an alias to
+`Cython.Distutils.old_build_ext.old_build_ext`; Cython 3 drops this
+alias and instead uses a wholly new `Cython.Distutils.build_ext` that
+does not provide the `cython_sources` function used in `setup.py`.
+
+Explicitly importing `old_build_ext` preserves the existing behavior for
+recent Cython<3 and uses the correct behavior for Cython 3. Should the
+import fail (*e.g.*, because the version of Cython available predates
+the availability of `old_build_ext`), the import falls back to just
+`Cython.Distutils.build_ext`.
+
+Signed-off-by: Andrew J. Hesford <ajh@sideband.org>
+---
+ setup.py | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/setup.py b/setup.py
+index 944e7fa2..462b1e95 100644
+--- a/setup.py
++++ b/setup.py
+@@ -82,7 +82,11 @@
+     with_cython = True
+ try:
+     from Cython.Distutils.extension import Extension as _Extension
+-    from Cython.Distutils import build_ext as _build_ext
++    try:
++        from Cython.Distutils.old_build_ext import old_build_ext as _build_ext
++    except ImportError:
++        from Cython.Distutils import build_ext as _build_ext
++
+     with_cython = True
+ except ImportError:
+     if with_cython:

PyYAML.spec

@@ -7,7 +7,7 @@
 
 Name:           PyYAML
 Version:        6.0.1
-Release:        3%{?dist}
+Release:        4%{?dist}
 %global uversion %{version}
 Summary:        YAML parser and emitter for Python
 
@@ -15,6 +15,10 @@ License:        MIT
 URL:            https://github.com/yaml/pyyaml
 Source0:        https://github.com/yaml/pyyaml/archive/%{uversion}.tar.gz
 
+# Fix build with Cython 3
+# Proposed upstream but refused (upstream does not want Cython 3)
+Patch:          https://github.com/yaml/pyyaml/pull/731.patch
+
 BuildRequires:  gcc
 BuildRequires:  libyaml-devel
 
@@ -25,8 +29,7 @@ BuildRequires:  python2-setuptools
 
 BuildRequires:  python3-devel
 BuildRequires:  python3-setuptools
-# This requires cython 0.29, see https://github.com/yaml/pyyaml/issues/601
-BuildRequires:  python3-cython < 3
+BuildRequires:  python3-cython
 
 
 %global _description\
@@ -68,7 +71,7 @@ Summary:        %summary
 
 
 %prep
-%setup -q -n pyyaml-%{uversion}
+%autosetup -p1 -n pyyaml-%{uversion}
 chmod a-x examples/yaml-highlight/yaml_hl.py
 
 # remove pre-generated file
@@ -112,6 +115,9 @@ rm -rf ext/_yaml.c
 
 
 %changelog
+* Fri Jul 28 2023 Miro Hrončok <mhroncok@redhat.com> - 6.0.1-4
+- Fix build with Cython 3
+
 * Tue Jul 25 2023 Miro Hrončok <mhroncok@redhat.com> - 6.0.1-3
 - Pin Cython < 3 to build this package