Issue #13901: Prevent test_distutils failures on OS X with --enable-shared.

Lib/distutils/tests/support.py

@@ -200,6 +200,9 @@ def fixup_build_ext(cmd):
         cmd = build_ext(dist)
         support.fixup_build_ext(cmd)
         cmd.ensure_finalized()
+
+    Unlike most other Unix platforms, Mac OS X embeds absolute paths
+    to shared libraries into executables, so the fixup is not needed there.
     """
     if os.name == 'nt':
         cmd.debug = sys.executable.endswith('_d.exe')
@@ -210,6 +213,9 @@ def fixup_build_ext(cmd):
         runshared = sysconfig.get_config_var('RUNSHARED')
         if runshared is None:
             cmd.library_dirs = ['.']
+        else:
+            if sys.platform == 'darwin':
+                cmd.library_dirs = []
             else:
                 name, equals, value = runshared.partition('=')
                 cmd.library_dirs = value.split(os.pathsep)

Misc/NEWS

@@ -90,6 +90,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #13901: Prevent test_distutils failures on OS X with --enable-shared.
+
 - Issue #13676: Handle strings with embedded zeros correctly in sqlite3.
 
 - Issue #13506: Add '' to path for IDLE Shell when started and restarted with Restart Shell.