When working on a single file it would be nice to iterate on just building that file rather than the whole file. 

Quoting jason.chan@mongodb.com 

Additionally, it’d be really nice to locally build a single test file. For example, I’d like to be able to generate an executable for producer_consumer_queue_test locally to minimize compile time when I’m working on that class. Today, we’d be able to do that but it’d involve defining a new CppUnitTest for every individual test file. I’m wondering if there’s something more clever that can be done with the CppUnitTest target to infer that a sub-target should be generated for each cpp file, and then keep it out of the evergreen build.