Currently our debug split step is part of the binary/library macro. This clutters the build tree with duplicate targets like "foo_test" and "foo_test_with_debug". We could instead perform this step in the install macro for install targets only, which is were it is mostly desired to be performed. 

Then it would "foo_test" and "foo_test_split_debug" targets, where the split_debug target is only invoked via an install target.