From dc4717bac28b2a320e32e3f823eb4d7da3736aeb Mon Sep 17 00:00:00 2001
From: Mattia Basaglia <glax@dragon.best>
Date: Mon, 31 Jan 2022 17:10:45 +0100
Subject: [PATCH] fix: module extension detection for python 3.10 (#3663)

* Fix module extension detection for python 3.10

* Fix for python < 3.10

* Use importlib
---
 tools/pybind11NewTools.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/pybind11NewTools.cmake b/tools/pybind11NewTools.cmake
index 9e2fd2b4..0b4e21cc 100644
--- a/tools/pybind11NewTools.cmake
+++ b/tools/pybind11NewTools.cmake
@@ -110,7 +110,7 @@ if(NOT DEFINED PYTHON_MODULE_EXTENSION)
   execute_process(
     COMMAND
       "${${_Python}_EXECUTABLE}" "-c"
-      "from distutils import sysconfig as s;print(s.get_config_var('EXT_SUFFIX') or s.get_config_var('SO'))"
+      "import sys, importlib; s = importlib.import_module('distutils.sysconfig' if sys.version_info < (3, 10) else 'sysconfig'); print(s.get_config_var('EXT_SUFFIX') or s.get_config_var('SO'))"
     OUTPUT_VARIABLE _PYTHON_MODULE_EXTENSION
     ERROR_VARIABLE _PYTHON_MODULE_EXTENSION_ERR
     OUTPUT_STRIP_TRAILING_WHITESPACE)