How to get CMocka report in JUnit format?

I am able to use cmocka and getting default results on the screen. I want to get the results for the unit test in JUnit format.

CMocka supports JUnit format by using the env variable CMOCKA_MESSAGE_OUTPUT or using API cmocka_set_message_output(CM_OUTPUT_XML);

But still no xml file gets generated, Can anyone hepl out in obtaining results in JUnit format ?