switch to flit build backend

CHANGES.rst

@@ -5,6 +5,7 @@ Unreleased
 
 -   Python 3.12 compatibility.
 -   Require Werkzeug >= 2.3.6.
+-   Use ``flit_core`` instead of ``setuptools`` as build backend.
 -   Refactor how an app's root and instance paths are determined. :issue:`5160`
 
 

pyproject.toml

@@ -2,7 +2,7 @@
 name = "Flask"
 description = "A simple framework for building complex web applications."
 readme = "README.rst"
-license = {text = "BSD-3-Clause"}
+license = {file = "LICENSE.rst"}
 maintainers = [{name = "Pallets", email = "contact@palletsprojects.com"}]
 classifiers = [
     "Development Status :: 5 - Production/Stable",
@@ -44,11 +44,25 @@ dotenv = ["python-dotenv"]
 flask = "flask.cli:main"
 
 [build-system]
-requires = ["setuptools"]
+requires = ["flit_core<4"]
-build-backend = "setuptools.build_meta"
+build-backend = "flit_core.buildapi"
 
-[tool.setuptools.dynamic]
+[tool.flit.module]
-version = {attr = "flask.__version__"}
+name = "flask"
+
+[tool.flit.sdist]
+include = [
+    "docs/",
+    "examples/",
+    "requirements/",
+    "tests/",
+    "CHANGES.rst",
+    "CONTRIBUTING.rst",
+    "tox.ini",
+]
+exclude = [
+    "docs/_build/",
+]
 
 [tool.pytest.ini_options]
 testpaths = ["tests"]