From cf93f655758a1eceb0762a8a34074f567209fbf9 Mon Sep 17 00:00:00 2001
From: Lukas Burgholzer <burgholzer@me.com>
Date: Thu, 5 Sep 2024 15:32:20 +0200
Subject: [PATCH] =?UTF-8?q?=F0=9F=A9=B9=20make=20sure=20to=20define=20`Py?=
 =?UTF-8?q?=5FGIL=5FDISABLED`=20on=20Windows=20for=20Python=203.13t=20(#51?=
 =?UTF-8?q?3)?=
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## Description

As pointed out in
https://github.com/pypa/cibuildwheel/issues/1975#issuecomment-2296995654
free-threading (Python 3.13t) builds on Windows need to have
`Py_GIL_DISABLED` set in order to properly work.
This PR ensures that the corresponding setting is always set.

## Checklist:

<!---
This checklist serves as a reminder of a couple of things that ensure
your pull request will be merged swiftly.
-->

- [x] The pull request only contains commits that are related to it.
- [x] I have added appropriate tests and documentation.
- [x] I have made sure that all CI jobs on GitHub pass.
- [x] The pull request introduces no new warnings and follows the
project's style guidelines.

Signed-off-by: burgholzer <burgholzer@me.com>
---
 CMakeLists.txt | 5 +++++
 pyproject.toml | 7 +++++++
 2 files changed, 12 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b02d42746..4d384fa03 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,6 +25,11 @@ if(BUILD_MQT_QMAP_BINDINGS)
       ON
       CACHE BOOL "Prevent multiple searches for Python and instead cache the results.")
 
+  if(DISABLE_GIL)
+    message(STATUS "Disabling Python GIL")
+    add_compile_definitions(Py_GIL_DISABLED)
+  endif()
+
   # top-level call to find Python
   find_package(
     Python 3.8 REQUIRED
diff --git a/pyproject.toml b/pyproject.toml
index b5d558f25..9f35fcb07 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -128,6 +128,13 @@ sdist.exclude = [
 BUILD_MQT_QMAP_TESTS = "OFF"
 BUILD_MQT_QMAP_BINDINGS = "ON"
 
+[[tool.scikit-build.overrides]]
+if.python-version = ">=3.13"
+if.abi-flags = "t"
+if.platform-system = "win32"
+inherit.cmake.define = "append"
+cmake.define.DISABLE_GIL = "1"
+
 
 [tool.check-sdist]
 sdist-only = ["src/mqt/qmap/_version.py"]