I just had flash backs to a previous job where I was brought in to optimize another teams builds since they were now taking minutes instead of seconds.

I tracked it down to a folder with thousands of C++ files called things like uint_to_int.cc and inch_to_cm.cc and cm_to_m.cc. Basically the developer in charge of writing the conversion library took our typed units library and autogenerated a C++ file for every possible conversion the application might need to make.

Every time we added a new typed unit it would create another couple of dozen files to be compiled.