docs: def init_argparser_build_dir(
              self, argparser, help=(
                  'the build directory, where all sources will be copied to '
                  'as part of the build process; if left unspecified, the '
                  'default behavior is to create a new temporary directory '
                  'that will be removed upon conclusion of the build; if '
                  'specified, it must be an existing directory and all files '
                  'for the build will be copied there instead, overwriting any '
                  'existing file, with no cleanup done after.'
              )):
          """
          For setting up build directory
          """
  
          argparser.add_argument(
              '--build-dir', default=None, dest=BUILD_DIR,
              metavar=metavar(BUILD_DIR), help=help,
          )