Merge pull request #4576 from pypa/bugfix/distutils-284

Sync with distutils@30b7331

Author: jaraco

newsfragments/+61911d95.bugfix.rst

@@ -0,0 +1 @@
+Synced with pypa/distutils@30b7331 including fix for modified check on empty sources (pypa/distutils#284).

setuptools/_distutils/_modified.py

@@ -63,7 +63,7 @@ def missing_as_newer(source):
         return missing == 'newer' and not os.path.exists(source)
 
     ignored = os.path.exists if missing == 'ignore' else None
-    return any(
+    return not os.path.exists(target) or any(
         missing_as_newer(source) or _newer(source, target)
         for source in filter(ignored, sources)
     )

setuptools/_distutils/dist.py

@@ -658,7 +658,7 @@ def _show_help(
             )
             print()
 
-        for command in self.commands:
+        for command in commands:
             if isinstance(command, type) and issubclass(command, Command):
                 klass = command
             else:

setuptools/_distutils/tests/test_modified.py

@@ -117,3 +117,10 @@ def test_newer_pairwise_group(groups_target):
     newer = newer_pairwise_group([groups_target.newer], [groups_target.target])
     assert older == ([], [])
     assert newer == ([groups_target.newer], [groups_target.target])
+
+
+def test_newer_group_no_sources_no_target(tmp_path):
+    """
+    Consider no sources and no target "newer".
+    """
+    assert newer_group([], str(tmp_path / 'does-not-exist'))