From a6fa4839ba1c74a37cb43eefb959c0766594ec63 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20Gr=C3=B6nholm?= <alex.gronholm@nextday.fi>
Date: Mon, 8 Feb 2021 23:20:45 +0200
Subject: [PATCH] Updated vendored packaging to v20.9

---
 docs/news.rst                        |  4 ++++
 src/wheel/vendored/packaging/tags.py | 24 +++++++++++++++++++-----
 src/wheel/vendored/vendor.txt        |  2 +-
 3 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/docs/news.rst b/docs/news.rst
index f2cd7614..193f4a26 100644
--- a/docs/news.rst
+++ b/docs/news.rst
@@ -1,6 +1,10 @@
 Release Notes
 =============
 
+**UNRELEASED**
+
+- Updated vendored ``packaging`` library to v20.9
+
 **0.36.2 (2020-12-13)**
 
 - Updated vendored ``packaging`` library to v20.8
diff --git a/src/wheel/vendored/packaging/tags.py b/src/wheel/vendored/packaging/tags.py
index 3306c690..c2a140c2 100644
--- a/src/wheel/vendored/packaging/tags.py
+++ b/src/wheel/vendored/packaging/tags.py
@@ -458,14 +458,28 @@ def mac_platforms(version=None, arch=None):
                     major=major_version, minor=0, binary_format=binary_format
                 )
 
-    if version >= (11, 0) and arch == "x86_64":
+    if version >= (11, 0):
         # Mac OS 11 on x86_64 is compatible with binaries from previous releases.
         # Arm64 support was introduced in 11.0, so no Arm binaries from previous
         # releases exist.
-        for minor_version in range(16, 3, -1):
-            compat_version = 10, minor_version
-            binary_formats = _mac_binary_formats(compat_version, arch)
-            for binary_format in binary_formats:
+        #
+        # However, the "universal2" binary format can have a
+        # macOS version earlier than 11.0 when the x86_64 part of the binary supports
+        # that version of macOS.
+        if arch == "x86_64":
+            for minor_version in range(16, 3, -1):
+                compat_version = 10, minor_version
+                binary_formats = _mac_binary_formats(compat_version, arch)
+                for binary_format in binary_formats:
+                    yield "macosx_{major}_{minor}_{binary_format}".format(
+                        major=compat_version[0],
+                        minor=compat_version[1],
+                        binary_format=binary_format,
+                    )
+        else:
+            for minor_version in range(16, 3, -1):
+                compat_version = 10, minor_version
+                binary_format = "universal2"
                 yield "macosx_{major}_{minor}_{binary_format}".format(
                     major=compat_version[0],
                     minor=compat_version[1],
diff --git a/src/wheel/vendored/vendor.txt b/src/wheel/vendored/vendor.txt
index 99f51222..57233e13 100644
--- a/src/wheel/vendored/vendor.txt
+++ b/src/wheel/vendored/vendor.txt
@@ -1 +1 @@
-packaging==20.8
+packaging==20.9