code: def preprocess(
      self,
      source,
      output_file=None,
      macros=None,
      include_dirs=None,
      extra_preargs=None,
      extra_postargs=None,
  ):
      fixed_args = self._fix_compile_args(None, macros, include_dirs)
      ignore, macros, include_dirs = fixed_args
      pp_opts = gen_preprocess_options(macros, include_dirs)
      pp_args = self.preprocessor + pp_opts
      if output_file:
          pp_args.extend(["-o", output_file])
      if extra_preargs:
          pp_args[:0] = extra_preargs
      if extra_postargs:
          pp_args.extend(extra_postargs)
      pp_args.append(source)
  
      # We need to preprocess: either we're being forced to, or we're
      # generating output to stdout, or there's a target output file and
      # the source file is newer than the target (or the target doesn't
      # exist).
      if (
          self.force
          or output_file is None
          or newer(source, output_file)
      ):
          if output_file:
              self.mkpath(os.path.dirname(output_file))
          try:
              self.spawn(pp_args)
          except DistutilsExecError as msg:
              raise CompileError(msg)
  
file_path: catboost/contrib/tools/python3/src/Lib/distutils/unixccompiler.py
imports: import os, sys, re
  from distutils import sysconfig
  from distutils.dep_util import newer
  from distutils.ccompiler import CCompiler, gen_preprocess_options, gen_lib_options
  from distutils.errors import DistutilsExecError, CompileError, LibError, LinkError
  from distutils import log
label_desc: Use image node_id 1 for calling the UnixCCompiler obj's underlying member method code with example usage: obj.preprocess(source, output_file, macros, include_dirs, extra_preargs, extra_postargs) without return types