Patch #404680: disables the nis module and enables the dl module when

building under Cygwin.  Makes some fixes to the dlmodule in order to
    compile with Cygwin.

Lib/test/test_dl.py

@@ -9,6 +9,7 @@ from test_support import verbose,TestSkipped
 sharedlibs = [
     ('/usr/lib/libc.so', 'getpid'),
     ('/lib/libc.so.6', 'getpid'),
+    ('/usr/bin/cygwin1.dll', 'getpid'),
     ]
 
 for s, func in sharedlibs:

Modules/dlmodule.c

@@ -134,7 +134,7 @@ dl_getattr(dlobject *xp, char *name)
 
 
 static PyTypeObject Dltype = {
-	PyObject_HEAD_INIT(&PyType_Type)
+	PyObject_HEAD_INIT(NULL)
 	0,			/*ob_size*/
 	"dl",			/*tp_name*/
 	sizeof(dlobject),	/*tp_basicsize*/
@@ -199,7 +199,7 @@ insint(PyObject *d, char *name, int value)
 	Py_XDECREF(v);
 }
 
-void
+DL_EXPORT(void)
 initdl(void)
 {
 	PyObject *m, *d, *x;
@@ -211,6 +211,9 @@ initdl(void)
 		return;
 	}
 
+	/* Initialize object type */
+	Dltype.ob_type = &PyType_Type;
+
 	/* Create the module and add the functions */
 	m = Py_InitModule("dl", dl_methods);
 

setup.py

@@ -387,6 +387,7 @@ class PyBuildExt(build_ext):
             exts.append( Extension('dl', ['dlmodule.c']) )
             
             # Sun yellow pages. Some systems have the functions in libc.
+            if platform not in ['cygwin']:
                 if (self.compiler.find_library_file(lib_dirs, 'nsl')):
                     libs = ['nsl']
                 else: