How to use the autoconfig.build_directory function in autoconfig

def __init__(self, *args):
        parser_test_case.parser_test_case_t.__init__(self, *args)
        if not os.path.exists(autoconfig.build_directory):
            os.makedirs(autoconfig.build_directory)

prj_reader = parser.project_reader_t(self.config)
        prj_decls = prj_reader.read_files(
            self.__files,
            compilation_mode=parser.COMPILATION_MODE.FILE_BY_FILE)
        src_reader = parser.source_reader_t(self.config)
        src_decls = src_reader.read_file('separate_compilation/all.h')

        declarations.dump_declarations(
            src_decls,
            os.path.join(
                autoconfig.build_directory, 'separate_compilation.sr.txt'))

        declarations.dump_declarations(
            prj_decls,
            os.path.join(
                autoconfig.build_directory, 'separate_compilation.pr.txt'))

        self.assertTrue(
            src_decls == prj_decls,
            "There is a difference between declarations")

def test_cache_interface(self):
        cache_file = os.path.join(
            autoconfig.build_directory,
            'decl_cache_test.test_cache_read.cache')
        file1 = os.path.join(autoconfig.data_directory, 'decl_cache_file1.txt')
        file1_dup = os.path.join(
            autoconfig.data_directory,
            'decl_cache_file1_duplicate.txt')
        file2 = os.path.join(autoconfig.data_directory, 'decl_cache_file2.txt')
        diff_cfg_list = self.build_differing_cfg_list()
        def_cfg = diff_cfg_list[0]

        if os.path.exists(cache_file):
            os.remove(cache_file)

        cache = declarations_cache.file_cache_t(cache_file)
        self.assertTrue(len(cache._file_cache_t__cache) == 0)

        # test creating new entries for differing files

try:
            conf_t = parser.file_configuration_t
            fconfig = conf_t(
                data=xmlfile,
                start_with_declarations=None,
                content_type=conf_t.CONTENT_TYPE.GCCXML_GENERATED_FILE)

            prj_reader = parser.project_reader_t(self.config)
            prj_decls = prj_reader.read_files(
                [fconfig],
                compilation_mode=parser.COMPILATION_MODE.FILE_BY_FILE)

            declarations.dump_declarations(
                src_decls,
                os.path.join(
                    autoconfig.build_directory,
                    'xmlfile_reader.src.txt'))
            declarations.dump_declarations(
                prj_decls,
                os.path.join(
                    autoconfig.build_directory,
                    'xmlfile_reader.prj.txt'))

            if src_decls != prj_decls:
                self.fail(
                    "There is a difference between declarations in file %s." %
                    self.__fname)
        finally:
            pass  # utils.remove_file_no_raise( xmlfile, self.config )

def __test_correctness_impl(self, file_name):
        prj_reader = parser.project_reader_t(self.config)
        prj_decls = prj_reader.read_files(
            [file_name] * 2,
            compilation_mode=parser.COMPILATION_MODE.FILE_BY_FILE)
        src_reader = parser.source_reader_t(self.config)
        src_decls = src_reader.read_file(file_name)
        if src_decls != prj_decls:
            s = src_decls[0]
            p = prj_decls[0]
            bdir = autoconfig.build_directory
            with open(os.path.join(bdir, file_name + '.sr.txt'), 'w+') as sr:
                with open(
                        os.path.join(bdir, file_name + '.pr.txt'), 'w+') as pr:

                    declarations.print_declarations(
                        s, writer=lambda l: sr.write(l + os.linesep))
                    declarations.print_declarations(
                        p, writer=lambda l: pr.write(l + os.linesep))

            self.fail(
                "There is a difference between declarations in file %s." %
                file_name)

content_type=conf_t.CONTENT_TYPE.GCCXML_GENERATED_FILE)

            prj_reader = parser.project_reader_t(self.config)
            prj_decls = prj_reader.read_files(
                [fconfig],
                compilation_mode=parser.COMPILATION_MODE.FILE_BY_FILE)

            declarations.dump_declarations(
                src_decls,
                os.path.join(
                    autoconfig.build_directory,
                    'xmlfile_reader.src.txt'))
            declarations.dump_declarations(
                prj_decls,
                os.path.join(
                    autoconfig.build_directory,
                    'xmlfile_reader.prj.txt'))

            if src_decls != prj_decls:
                self.fail(
                    "There is a difference between declarations in file %s." %
                    self.__fname)
        finally:
            pass  # utils.remove_file_no_raise( xmlfile, self.config )