code: def _check_compiler_flag(self, flag):
      supports_flag = True
      DEVNULL = os.open(os.devnull, os.O_RDWR)
      try:
          subprocess.check_call(
              " ".join(self.compiler.compiler)
              + " {flag} -E -xc - -o -".format(flag=flag),
              stdin=DEVNULL,
              stdout=DEVNULL,
              stderr=DEVNULL,
              shell=True,
          )
      except Exception:
          supports_flag = False
      os.close(DEVNULL)
      return supports_flag
  
imports: import shutil
  import os
  from setuptools import Extension, setup
  import contextlib
  import io
  import os.path
  import json
  import tempfile
  from setuptools.command.build_ext import build_ext, new_compiler
  from Cython.Build import cythonize
  import subprocess
  import sys
  import platform
  import numpy
label_desc: Use image node_id 3 for calling the ExtensionBuilder obj's underlying member method code with example usage: obj._check_compiler_flag(flag) and returns: supports_flag