code: def compile_classpath(self, classpath_product_key, target, extra_cp_entries=None):
      
  
      classpath_entries = list(
        entry.path
          for entry in self.compile_classpath_entries(classpath_product_key, target, extra_cp_entries)
      )
  
      # Verify that all classpath entries are under the build root.
      for entry in classpath_entries:
        assert entry.startswith(get_buildroot()), \
               "Classpath entry does not start with buildroot: {}".format(entry)
  
      return classpath_entries
docs: Compute the compile classpath for the given target.