From 97a8f11a8a039fc0de04a31d281715f1ce6ea4bc Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Tue, 1 Sep 2020 21:18:01 -0400
Subject: [PATCH] Restore pythonlib support on older Pythons. Fixes
 pypa/distutils#9.

---
 distutils/command/build_ext.py  |  3 ++-
 distutils/command/py37compat.py | 30 ++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 1 deletion(-)
 create mode 100644 distutils/command/py37compat.py

diff --git a/distutils/command/build_ext.py b/distutils/command/build_ext.py
index 1a9bd1200f..bbb348331b 100644
--- a/distutils/command/build_ext.py
+++ b/distutils/command/build_ext.py
@@ -16,6 +16,7 @@
 from distutils.extension import Extension
 from distutils.util import get_platform
 from distutils import log
+from . import py37compat
 
 from site import USER_BASE
 
@@ -751,4 +752,4 @@ def get_libraries(self, ext):
                 ldversion = get_config_var('LDVERSION')
                 return ext.libraries + ['python' + ldversion]
 
-        return ext.libraries
+        return ext.libraries + py37compat.pythonlib()
diff --git a/distutils/command/py37compat.py b/distutils/command/py37compat.py
new file mode 100644
index 0000000000..754715a508
--- /dev/null
+++ b/distutils/command/py37compat.py
@@ -0,0 +1,30 @@
+import sys
+
+
+def _pythonlib_compat():
+    """
+    On Python 3.7 and earlier, distutils would include the Python
+    library. See pypa/distutils#9.
+    """
+    from distutils import sysconfig
+    if not sysconfig.get_config_var('Py_ENABLED_SHARED'):
+        return
+
+    yield 'python{}.{}{}'.format(
+        sys.hexversion >> 24,
+        (sys.hexversion >> 16) & 0xff,
+        sysconfig.get_config_var('ABIFLAGS'),
+    )
+
+
+def compose(f1, f2):
+    return lambda *args, **kwargs: f1(f2(*args, **kwargs))
+
+
+pythonlib = (
+    compose(list, _pythonlib_compat)
+    if sys.version_info < (3, 8)
+    and sys.platform != 'darwin'
+    and sys.platform[:3] != 'aix'
+    else list
+)