From a019695b629ac347fca6fed5d9bf7caf417becc0 Mon Sep 17 00:00:00 2001
From: Thomas A Caswell <tcaswell@gmail.com>
Date: Thu, 21 Sep 2023 13:50:08 -0400
Subject: [PATCH] Backport PR #26849: Bump setuptools required version because
 of setuptools_scm v8

---
 doc/api/next_api_changes/development/26849-KS.rst | 5 +++++
 doc/devel/dependencies.rst                        | 2 +-
 pyproject.toml                                    | 9 ++++++++-
 requirements/testing/mypy.txt                     | 1 +
 setup.py                                          | 5 ++++-
 5 files changed, 19 insertions(+), 3 deletions(-)
 create mode 100644 doc/api/next_api_changes/development/26849-KS.rst

diff --git a/doc/api/next_api_changes/development/26849-KS.rst b/doc/api/next_api_changes/development/26849-KS.rst
new file mode 100644
index 000000000000..1a1deda40fca
--- /dev/null
+++ b/doc/api/next_api_changes/development/26849-KS.rst
@@ -0,0 +1,5 @@
+Minimum version of setuptools bumped to 64
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+To comply with requirements of ``setuptools_scm``, the minimum version of ``setuptools``
+has been increased from 42 to 64.
diff --git a/doc/devel/dependencies.rst b/doc/devel/dependencies.rst
index a865b80cab84..400bc63d42ac 100644
--- a/doc/devel/dependencies.rst
+++ b/doc/devel/dependencies.rst
@@ -228,7 +228,7 @@ Setup dependencies
   runtime dependency.
 - `PyBind11 <https://pypi.org/project/pybind11/>`_ (>= 2.6). Used to connect C/C++ code
   with Python.
-- `setuptools <https://pypi.org/project/setuptools/>`_ (>= 42).
+- `setuptools <https://pypi.org/project/setuptools/>`_ (>= 64).
 - `setuptools_scm <https://pypi.org/project/setuptools-scm/>`_ (>= 7).  Used to
   update the reported ``mpl.__version__`` based on the current git commit.
   Also a runtime dependency for editable installs.
diff --git a/pyproject.toml b/pyproject.toml
index d2e2f769b7ef..67f1805cda08 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,10 +4,17 @@ requires = [
     "certifi>=2020.06.20",
     "numpy>=1.25",
     "pybind11>=2.6",
-    "setuptools>=42",
+    "setuptools>=64",
     "setuptools_scm>=7",
 ]
 
+[tool.setuptools_scm]
+version_scheme = "release-branch-semver"
+local_scheme = "node-and-date"
+write_to = "lib/matplotlib/_version.py"
+parentdir_prefix_version = "matplotlib-"
+fallback_version = "0.0+UNKNOWN"
+
 [tool.isort]
 known_pydata = "numpy, matplotlib.pyplot"
 known_firstparty = "matplotlib,mpl_toolkits"
diff --git a/requirements/testing/mypy.txt b/requirements/testing/mypy.txt
index f697772da5ea..a5ca15cfbdad 100644
--- a/requirements/testing/mypy.txt
+++ b/requirements/testing/mypy.txt
@@ -24,5 +24,6 @@ pillow>=8
 pyparsing>=2.3.1
 python-dateutil>=2.7
 setuptools_scm>=7
+setuptools>=64
 
 importlib-resources>=3.2.0 ; python_version < "3.10"
diff --git a/setup.py b/setup.py
index 9c37c2108286..6f277d4e4d7d 100644
--- a/setup.py
+++ b/setup.py
@@ -340,7 +340,10 @@ def make_release_tree(self, base_dir, files):
         "python-dateutil>=2.7",
     ] + (
         # Installing from a git checkout that is not producing a wheel.
-        ["setuptools_scm>=7"] if (
+        # setuptools_scm warns with older setuptools, which turns into errors for our
+        # test suite. However setuptools_scm does not themselves pin the version of
+        # setuptools.
+        ["setuptools_scm>=7", "setuptools>=64"] if (
             Path(__file__).with_name(".git").exists() and
             os.environ.get("CIBUILDWHEEL", "0") != "1"
         ) else []