From 382037c446f45ebc2e91fd5144eda4dfa90c0281 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Sun, 26 Dec 2021 14:15:15 -0500
Subject: [PATCH 1/2] Add setuptools.log to supersede distutils.log. Ref #2973.

---
 changelog.d/2974.change.rst |  1 +
 setuptools/__init__.py      |  2 ++
 setuptools/logging.py       | 22 ++++++++++++++++++++++
 3 files changed, 25 insertions(+)
 create mode 100644 changelog.d/2974.change.rst
 create mode 100644 setuptools/logging.py

diff --git a/changelog.d/2974.change.rst b/changelog.d/2974.change.rst
new file mode 100644
index 0000000000..fcfa00496d
--- /dev/null
+++ b/changelog.d/2974.change.rst
@@ -0,0 +1 @@
+Setuptools now relies on the Python logging infrastructure to log messages. Instead of using ``distutils.log.*``, use ``logging.getLogger(name).*``.
diff --git a/setuptools/__init__.py b/setuptools/__init__.py
index 9d6f0bc0dd..43d1c96eb2 100644
--- a/setuptools/__init__.py
+++ b/setuptools/__init__.py
@@ -18,6 +18,7 @@
 from setuptools.dist import Distribution
 from setuptools.depends import Require
 from . import monkey
+from . import logging
 
 
 __all__ = [
@@ -149,6 +150,7 @@ def finalize_options(self):
 
 def setup(**attrs):
     # Make sure we have any requirements needed to interpret 'attrs'.
+    logging.configure()
     _install_setup_requires(attrs)
     return distutils.core.setup(**attrs)
 
diff --git a/setuptools/logging.py b/setuptools/logging.py
new file mode 100644
index 0000000000..0ac4705911
--- /dev/null
+++ b/setuptools/logging.py
@@ -0,0 +1,22 @@
+import sys
+import logging
+
+
+def _not_warning(record):
+    return record.levelno < logging.WARNING
+
+
+def configure():
+    """
+    Configure logging to emit warning and above to stderr
+    and everything else to stdout. This behavior is provided
+    for compatibilty with distutils.log but may change in
+    the future.
+    """
+    err_handler = logging.StreamHandler()
+    err_handler.setLevel(logging.WARNING)
+    out_handler = logging.StreamHandler(sys.stdout)
+    out_handler.addFilter(_not_warning)
+    handlers = err_handler, out_handler
+    logging.basicConfig(
+        format="{message}", style='{', handlers=handlers, level=logging.DEBUG)

From b9cf7ff3ff907b5a805264b399b17e4ea6bec049 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Sun, 26 Dec 2021 15:23:28 -0500
Subject: [PATCH 2/2] Monkey patch distutils.log.set_threshold so the Python
 logger honors calls to it.

---
 setuptools/logging.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/setuptools/logging.py b/setuptools/logging.py
index 0ac4705911..dbead6e664 100644
--- a/setuptools/logging.py
+++ b/setuptools/logging.py
@@ -1,5 +1,7 @@
 import sys
 import logging
+import distutils.log
+from . import monkey
 
 
 def _not_warning(record):
@@ -20,3 +22,9 @@ def configure():
     handlers = err_handler, out_handler
     logging.basicConfig(
         format="{message}", style='{', handlers=handlers, level=logging.DEBUG)
+    monkey.patch_func(set_threshold, distutils.log, 'set_threshold')
+
+
+def set_threshold(level):
+    logging.root.setLevel(level*10)
+    return set_threshold.unpatched(level)