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    conf_nocache : bool
        Set True to disable memory and file cache.
        Default is False.

    conf_noopt : bool
        Set True to forces the optimization to be disabled,
        in this case `CCompilerOpt` tends to generate all
        expected headers in order to 'not' break the build.
        Default is False.

    conf_cache_factors : list
        Add extra factors to the primary caching factors. The caching factors
        are utilized to determine if there are changes had happened that
        requires to discard the cache and re-updating it. The primary factors
        are the arguments of `CCompilerOpt` and `CCompiler`'s properties(type, flags, etc).
        Default is list of two items, containing the time of last modification
        of `ccompiler_opt` and value of attribute "conf_noopt"

    conf_tmp_path : str,
        The path of temporary directory. Default is auto-created
        temporary directory via ``tempfile.mkdtemp()``.

    conf_check_path : str
        The path of testing files. Each added CPU feature must have a
        **C** source file contains at least one intrinsic or instruction that
        related to this feature, so it can be tested against the compiler.
        Default is ``./distutils/checks``.

    conf_target_groups : dict
        Extra tokens that can be reached from dispatch-able sources through
        the special mark ``@targets``. Default is an empty dictionary.

        **Notes**:
            - case-insensitive for tokens and group names
            - sign '#' must stick in the begin of group name and only within ``@targets``

        **Example**:
            .. code-block:: console

                $ "@targets #avx_group other_tokens" > group_inside.c

            >>> CCompilerOpt.conf_target_groups["avx_group"] = \
            "$werror $maxopt avx2 avx512f avx512_skx"
            >>> cco = CCompilerOpt(cc_instance)
            >>> cco.try_dispatch(["group_inside.c"])

    conf_c_prefix : str
        The prefix of public C definitions. Default is ``"NPY_"``.

    conf_c_prefix_ : str
        The prefix of internal C definitions. Default is ``"NPY__"``.

    conf_cc_flags : dict
        Nested dictionaries defining several compiler flags
        that linked to some major functions, the main key
        represent the compiler name and sub-keys represent
        flags names. Default is already covers all supported
        **C** compilers.

        Sub-keys explained as follows:

        "native": str or None
            used by argument option `native`, to detect the current
            machine support via the compiler.
        "werror": str or None
            utilized to treat warning as errors during testing CPU features
            against the compiler and also for target's policy `$werror`
            via dispatch-able sources.
        "maxopt": str or None
            utilized for target's policy '$maxopt' and the value should
            contains the maximum acceptable optimization by the compiler.
            e.g. in gcc `'-O3'`

        **Notes**:
            * case-sensitive for compiler names and flags
            * use space to separate multiple flags
            * any flag will tested against the compiler and it will skipped
              if it's not applicable.

    conf_min_features : dict
        A dictionary defines the used CPU features for
        argument option `'min'`, the key represent the CPU architecture
        name e.g. `'x86'`. Default values provide the best effort
        on wide range of users platforms.

        **Note**: case-sensitive for architecture names.

    conf_features : dict
        Nested dictionaries used for identifying the CPU features.
        the primary key is represented as a feature name or group name
        that gathers several features. Default values covers all
        supported features but without the major options like "flags",
        these undefined options handle it by method `conf_features_partial()`.
        Default value is covers almost all CPU features for *X86*, *IBM/Power64*
        and *ARM 7/8*.

        Sub-keys explained as follows:

        "implies" : str or list, optional,
            List of CPU feature names to be implied by it,
            the feature name must be defined within `conf_features`.
            Default is None.

        "flags": str or list, optional
            List of compiler flags. Default is None.

        "detect": str or list, optional
            List of CPU feature names that required to be detected
            in runtime. By default, its the feature name or features
            in "group" if its specified.

        "implies_detect": bool, optional
            If True, all "detect" of implied features will be combined.
            Default is True. see `feature_detect()`.

        "group": str or list, optional
            Same as "implies" but doesn't require the feature name to be
            defined within `conf_features`.

        "interest": int, required
            a key for sorting CPU features

        "headers": str or list, optional
            intrinsics C header file

        "disable": str, optional
            force disable feature, the string value should contains the
            reason of disabling.

        "autovec": bool or None, optional
            True or False to declare that CPU feature can be auto-vectorized
            by the compiler.
            By default(None), treated as True if the feature contains at
            least one applicable flag. see `feature_can_autovec()`

        "extra_checks": str or list, optional
            Extra test case names for the CPU feature that need to be tested
            against the compiler.

            Each test case must have a C file named ``extra_xxxx.c``, where
            ``xxxx`` is the case name in lower case, under 'conf_check_path'.
            It should contain at least one intrinsic or function related to the test case.

            If the compiler able to successfully compile the C file then `CCompilerOpt`
            will add a C ``#define`` for it into the main dispatch header, e.g.
            ```#define {conf_c_prefix}_XXXX`` where ``XXXX`` is the case name in upper case.

        **NOTES**:
            * space can be used as separator with options that supports "str or list"
            * case-sensitive for all values and feature name must be in upper-case.
            * if flags aren't applicable, its will skipped rather than disable the
              CPU feature
            * the CPU feature will disabled if the compiler fail to compile
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