(self, xcode_settings,
               gyp_path_to_build_path, gyp_path_to_build_output)
If xcode_settings is None, all methods on this class are no-ops.

    Args:
        gyp_path_to_build_path: A function that takes a gyp-relative path,
            and returns a path relative to the build directory.
        gyp_path_to_build_output: A function that takes a gyp-relative path and
            a language code ('c', 'cc', 'm', or 'mm'), and that returns a path
            to where the output of precompiling that path for that language
            should be placed (without the trailing '.gch').
If xcode_settings is None, all methods on this class are no-ops.
If xcode_settings is None all methods on this class are no - ops .
def __init__(self, xcode_settings,
               gyp_path_to_build_path, gyp_path_to_build_output):
    """If xcode_settings is None, all methods on this class are no-ops.

    Args:
        gyp_path_to_build_path: A function that takes a gyp-relative path,
            and returns a path relative to the build directory.
        gyp_path_to_build_output: A function that takes a gyp-relative path and
            a language code ('c', 'cc', 'm', or 'mm'), and that returns a path
            to where the output of precompiling that path for that language
            should be placed (without the trailing '.gch').
    """
    # This doesn't support per-configuration prefix headers. Good enough
    # for now.
    self.header = None
    self.compile_headers = False
    if xcode_settings:
      self.header = xcode_settings.GetPerTargetSetting('GCC_PREFIX_HEADER')
      self.compile_headers = xcode_settings.GetPerTargetSetting(
          'GCC_PRECOMPILE_PREFIX_HEADER', default='NO') != 'NO'
    self.compiled_headers = {}
    if self.header:
      if self.compile_headers:
        for lang in ['c', 'cc', 'm', 'mm']:
          self.compiled_headers[lang] = gyp_path_to_build_output(
              self.header, lang)
      self.header = gyp_path_to_build_path(self.header)
def __init__ ( self , xcode_settings , gyp_path_to_build_path , gyp_path_to_build_output ) : # This doesn't support per-configuration prefix headers. Good enough # for now. self . header = None self . compile_headers = False if xcode_settings : self . header = xcode_settings . GetPerTargetSetting ( 'GCC_PREFIX_HEADER' ) self . compile_headers = xcode_settings . GetPerTargetSetting ( 'GCC_PRECOMPILE_PREFIX_HEADER' , default = 'NO' ) != 'NO' self . compiled_headers = { } if self . header : if self . compile_headers : for lang in [ 'c' , 'cc' , 'm' , 'mm' ] : self . compiled_headers [ lang ] = gyp_path_to_build_output ( self . header , lang ) self . header = gyp_path_to_build_path ( self . header )