disable forked testing when collecting test results as XML, doesn't currently work together

Cython/Tests/xmlrunner.py

@@ -155,15 +155,11 @@ class _XMLTestResult(_TextTestResult):
         "Write some information about the FAIL or ERROR to the stream."
         for test_info in errors:
             self.stream.writeln(self.separator1)
-            if isinstance(test_info, _TestInfo):
-                self.stream.writeln('%s [%.3fs]: %s' % \
-                    (flavour, test_info.get_elapsed_time(), \
-                    test_info.get_description()))
-                self.stream.writeln(self.separator2)
-                self.stream.writeln('%s' % test_info.get_error_info())
-            else:
-                self.stream.writeln(str(test_info))
-                self.stream.writeln(self.separator2)
+            self.stream.writeln('%s [%.3fs]: %s' % \
+                (flavour, test_info.get_elapsed_time(), \
+                test_info.get_description()))
+            self.stream.writeln(self.separator2)
+            self.stream.writeln('%s' % test_info.get_error_info())
 
     def _get_info_by_testcase(self):
         """This method organizes test results by TestCase module. This

runtests.py

@@ -882,6 +882,11 @@ if __name__ == '__main__':
     if options.doctests:
         collect_doctests(UNITTEST_ROOT, UNITTEST_MODULE + ".", test_suite, selectors)
 
+    if options.xml_output_dir:
+        # doesn't currently work together
+        print("Disabling forked testing to support XML test output")
+        options.fork = False
+
     if options.filetests and languages:
         filetests = TestBuilder(ROOTDIR, WORKDIR, selectors, exclude_selectors,
                                 options.annotate_source, options.cleanup_workdir,