From b94f0c5fb7554dd907eb7b9c9c4ce4f71d7bbf13 Mon Sep 17 00:00:00 2001
From: Ralf Gommers <ralf.gommers@gmail.com>
Date: Sun, 17 Sep 2023 21:01:58 +0200
Subject: [PATCH] BLD: add a Cython <3.0 constraint on Windows (32-bit Python
 tests crash)

---
 pyproject.toml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pyproject.toml b/pyproject.toml
index 844f2c0c..1b437902 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,9 @@
 build-backend = "mesonpy"
 requires = [
     "meson-python>=0.14.0",
-    "Cython>=0.29.35",  # when updating version, also update check in meson.build
+    # when updating Cython version, also update check in meson.build
+    "Cython>=0.29.35,<3.0; python_version>='3.12' and platform_system=='Windows'",
+    "Cython>=0.29.35; python_version<'3.12' or platform_system!='Windows'",
 
     # When numpy 2.0.0rc1 comes out, we should update this to build against 2.0,
     # and then runtime depend on the range 1.22.X to <2.3.