Merge pull request #4947 from neutrinoceros/bld/switch_to_stable_buil…

…d_backend

BLD: switch to stable setuptools build backend

pyproject.toml

@@ -9,7 +9,7 @@ requires = [
   "numpy>=2.0.0",
   "ewah-bool-utils>=1.2.0",
 ]
-build-backend = "setuptools.build_meta:__legacy__"
+build-backend = "setuptools.build_meta"
 
 [project]
 name = "yt"

setup.py

@@ -1,11 +1,16 @@
 import glob
 import os
+import sys
 from collections import defaultdict
 from distutils.ccompiler import get_default_compiler
 from importlib import resources as importlib_resources
 
 from setuptools import Distribution, setup
 
+# ensure enclosing directory is in PYTHON_PATH to allow importing from setupext.py
+if (script_dir := os.path.dirname(__file__)) not in sys.path:
+    sys.path.insert(0, script_dir)
+
 from setupext import (
     NUMPY_MACROS,
     check_CPP14_flags,