e C preprocessor (CPP) is a standard tool for introducing variability into source programs and is o en applied either implicitly or explicitly for implementing a So ware Product Line (SPL). Despite its practical relevance, CPP has many drawbacks. Because of that it is very di cult to understand the variability implemented using CPP. To facilitate this task we provide an innovative analytics tool which bridges the gap between feature models as more abstract representations of variability and its concrete implementation with the means of CPP. It allows to interactively explore the entities of a source program with respect to the variability realized by conditional compilation. us, it simpli es tracing and understanding the e ect of enabling or disabling feature ags.
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