Ensure that namespace packages are implicitly declared as packages. Ref #97.

2 files changed, 15 insertions, 1 deletions

diff --git a/CHANGES.rst b/CHANGES.rst
index 47164e09..400e9094 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,6 +2,12 @@
 CHANGES
 =======
 
+v28.7.1
+-------
+
+* #97: Declaring a namespace package implicitly also
+  declares the package.
+
 v28.6.1
 -------
 
diff --git a/setuptools/dist.py b/setuptools/dist.py
index 612040c8..8058ee7c 100644
--- a/setuptools/dist.py
+++ b/setuptools/dist.py
@@ -104,9 +104,17 @@ def assert_string_list(dist, attr, value):
 
 
 def check_nsp(dist, attr, value):
-    """Verify that namespace packages are valid"""
+    """
+    Verify that namespace packages are valid and ensure that any
+    namespace packages imply a package.
+    """
     ns_packages = value
     assert_string_list(dist, attr, ns_packages)
+    dist.packages = dist.packages or []
+    dist.packages.extend(
+        package for package in ns_packages
+        if package not in dist.packages
+    )
     for nsp in ns_packages:
         if not dist.has_contents_for(nsp):
             raise DistutilsSetupError(