cppunit can create XML output similar to JUnit XML output, but with different tags and attributes.

Sample cppunit output:
<?xml version="1.0" encoding='ISO-8859-1' standalone='yes' ?>
<TestRun>
  <FailedTests>
    <FailedTest id="2">
      <Name>DatastoreTestFixture::testCreateConnection</Name>
      <FailureType>Error</FailureType>
      <Message>uncaught exception of unknown type
      </Message>
    </FailedTest>
  </FailedTests>
  <SuccessfulTests>
    <Test id="1">
      <Name>DatastoreTestFixture::testConstructor</Name>
    </Test>
    <Test id="3">
      <Name>DatastoreTestFixture::testGetConnectionStatus</Name>
    </Test>
  </SuccessfulTests>
  <Statistics>
    <Tests>3</Tests>
    <FailuresTotal>1</FailuresTotal>
    <Errors>1</Errors>
    <Failures>0</Failures>
  </Statistics>
</TestRun>