code: def runtime_library_dir_option(self, dir):
      # XXX Hackish, at the very least.  See Python bug #445902:
      # http://sourceforge.net/tracker/index.php
      #   ?func=detail&aid=445902&group_id=5470&atid=105470
      # Linkers on different platforms need different options to
      # specify that directories need to be added to the list of
      # directories searched for dependencies when a dynamic library
      # is sought.  GCC on GNU systems (Linux, FreeBSD, ...) has to
      # be told to pass the -R option through to the linker, whereas
      # other compilers and gcc on other systems just know this.
      # Other compilers may need something slightly different.  At
      # this time, there's no way to determine this information from
      # the configuration data stored in the Python installation, so
      # we use this hack.
      if sys.platform[:6] == "darwin":
          from distutils.util import (
              get_macosx_target_ver,
              split_version,
          )
  
          macosx_target_ver = get_macosx_target_ver()
          if macosx_target_ver and split_version(macosx_target_ver) >= [
              10,
              5,
          ]:
              return "-Wl,-rpath," + dir
          else:  # no support for -rpath on earlier macOS versions
              return "-L" + dir
      elif sys.platform[:7] == "freebsd":
          return "-Wl,-rpath=" + dir
      elif sys.platform[:5] == "hp-ux":
          return [
              "-Wl,+s" if self._is_gcc() else "+s",
              "-L" + dir,
          ]
  
      # For all compilers, `-Wl` is the presumed way to
      # pass a compiler option to the linker and `-R` is
      # the way to pass an RPATH.
      if sysconfig.get_config_var("GNULD") == "yes":
          # GNU ld needs an extra option to get a RUNPATH
          # instead of just an RPATH.
          return "-Wl,--enable-new-dtags,-R" + dir
      else:
          return "-Wl,-R" + dir
  
imports: import os
  import sys
  import re
  import shlex
  import itertools
  from .None import sysconfig
  from ._modified import newer
  from .ccompiler import CCompiler, gen_preprocess_options, gen_lib_options
  from .errors import DistutilsExecError, CompileError, LibError, LinkError
  from ._log import log
  from ._macos_compat import compiler_fixup
label_desc: Use image node_id 7 for calling the UnixCCompiler obj's underlying member method code with example usage: obj.runtime_library_dir_option(dir) and returns: unknown, unknown, unknown, unknown, unknown, list