code: def _add_pgo_flags(self, build_extension, step_name, temp_dir):
      compiler_type = build_extension.compiler.compiler_type
      if compiler_type == "unix":
          compiler_cmd = build_extension.compiler.compiler_so
          # TODO: we could try to call "[cmd] --version" for better insights
          if not compiler_cmd:
              pass
          elif "clang" in compiler_cmd or "clang" in compiler_cmd[0]:
              compiler_type = "clang"
          elif "icc" in compiler_cmd or "icc" in compiler_cmd[0]:
              compiler_type = "icc"
          elif "gcc" in compiler_cmd or "gcc" in compiler_cmd[0]:
              compiler_type = "gcc"
          elif "g++" in compiler_cmd or "g++" in compiler_cmd[0]:
              compiler_type = "gcc"
      config = PGO_CONFIG.get(compiler_type)
      orig_flags = []
      if config and step_name in config:
          flags = [
              f.format(TEMPDIR=temp_dir) for f in config[step_name]
          ]
          for extension in build_extension.extensions:
              orig_flags.append(
                  (
                      extension.extra_compile_args,
                      extension.extra_link_args,
                  )
              )
              extension.extra_compile_args = (
                  extension.extra_compile_args + flags
              )
              extension.extra_link_args = (
                  extension.extra_link_args + flags
              )
      else:
          print(
              "No PGO %s configuration known for C compiler type '%s'"
              % (step_name, compiler_type),
              file=sys.stderr,
          )
      return orig_flags
  
imports: from __future__ import absolute_import, print_function
  import io
  import os
  import re
  import sys
  import time
  import copy
  import distutils.log
  import textwrap
  from distutils.core import Distribution, Extension
  from distutils.command.build_ext import build_ext
  from IPython.core import display
  from IPython.core import magic_arguments
  from IPython.core.magic import Magics, magics_class, cell_magic
  from IPython.utils.text import dedent
  from ..Shadow import __version__
  from ..Compiler.Errors import CompileError
  from .Inline import cython_inline, load_dynamic
  from .Dependencies import cythonize
label_desc: Use image node_id 9 for calling the CythonMagics obj's underlying member method code with example usage: obj._add_pgo_flags(build_extension, step_name, temp_dir) and returns: orig_flags