+extern const unsigned int cl_lang_count;
+
+#define CL_PARAMS (1U << 16) /* Fake entry. Used to display --param info with --help. */
+#define CL_WARNING (1U << 17) /* Enables an (optional) warning message. */
+#define CL_OPTIMIZATION (1U << 18) /* Enables an (optional) optimization. */
+#define CL_DRIVER (1U << 19) /* Driver option. */
+#define CL_TARGET (1U << 20) /* Target-specific option. */
+#define CL_COMMON (1U << 21) /* Language-independent. */
+
+#define CL_MIN_OPTION_CLASS CL_PARAMS
+#define CL_MAX_OPTION_CLASS CL_COMMON
+
+/* From here on the bits describe attributes of the options.
+ Before this point the bits have described the class of the option.
+ This distinction is important because --help will not list options
+ which only have these higher bits set. */
+
+#define CL_JOINED (1U << 22) /* If takes joined argument. */
+#define CL_SEPARATE (1U << 23) /* If takes a separate argument. */
+#define CL_UNDOCUMENTED (1U << 24) /* Do not output with --help. */
+
+/* Flags for an enumerated option argument. */
+#define CL_ENUM_CANONICAL (1 << 0) /* Canonical for this value. */
+#define CL_ENUM_DRIVER_ONLY (1 << 1) /* Only accepted in the driver. */
+
+/* Structure describing an enumerated option argument. */
+
+struct cl_enum_arg
+{
+ /* The argument text, or NULL at the end of the array. */
+ const char *arg;
+
+ /* The corresponding integer value. */
+ int value;
+
+ /* Flags associated with this argument. */
+ unsigned int flags;
+};
+
+/* Structure describing an enumerated set of option arguments. */
+
+struct cl_enum
+{
+ /* Help text, or NULL if the values should not be listed in --help
+ output. */
+ const char *help;
+
+ /* Error message for unknown arguments, or NULL to use a generic
+ error. */
+ const char *unknown_error;
+
+ /* Array of possible values. */
+ const struct cl_enum_arg *values;
+
+ /* The size of the type used to store a value. */
+ size_t var_size;
+
+ /* Function to set a variable of this type. */
+ void (*set) (void *var, int value);
+
+ /* Function to get the value of a variable of this type. */
+ int (*get) (const void *var);
+};
+
+extern const struct cl_enum cl_enums[];
+extern const unsigned int cl_enums_count;
+
+/* Possible ways in which a command-line option may be erroneous.
+ These do not include not being known at all; an option index of
+ OPT_SPECIAL_unknown is used for that. */
+
+#define CL_ERR_DISABLED (1 << 0) /* Disabled in this configuration. */
+#define CL_ERR_MISSING_ARG (1 << 1) /* Argument required but missing. */
+#define CL_ERR_WRONG_LANG (1 << 2) /* Option for wrong language. */
+#define CL_ERR_UINT_ARG (1 << 3) /* Bad unsigned integer argument. */
+#define CL_ERR_ENUM_ARG (1 << 4) /* Bad enumerated argument. */
+#define CL_ERR_NEGATIVE (1 << 5) /* Negative form of option
+ not permitted (together
+ with OPT_SPECIAL_unknown). */
+
+/* Structure describing the result of decoding an option. */
+
+struct cl_decoded_option
+{
+ /* The index of this option, or an OPT_SPECIAL_* value for
+ non-options and unknown options. */
+ size_t opt_index;
+
+ /* Any warning to give for use of this option, or NULL if none. */
+ const char *warn_message;
+
+ /* The string argument, or NULL if none. For OPT_SPECIAL_* cases,
+ the option or non-option command-line argument. */
+ const char *arg;
+
+ /* The original text of option plus arguments, with separate argv
+ elements concatenated into one string with spaces separating
+ them. This is for such uses as diagnostics and
+ -frecord-gcc-switches. */
+ const char *orig_option_with_args_text;
+
+ /* The canonical form of the option and its argument, for when it is
+ necessary to reconstruct argv elements (in particular, for
+ processing specs and passing options to subprocesses from the
+ driver). */
+ const char *canonical_option[4];
+
+ /* The number of elements in the canonical form of the option and
+ arguments; always at least 1. */
+ size_t canonical_option_num_elements;
+
+ /* For a boolean option, 1 for the true case and 0 for the "no-"
+ case. For an unsigned integer option, the value of the
+ argument. 1 in all other cases. */
+ int value;
+
+ /* Any flags describing errors detected in this option. */
+ int errors;
+};
+
+/* Structure describing an option deferred for handling after the main
+ option handlers. */
+
+typedef struct
+{
+ /* Elements from struct cl_decoded_option used for deferred
+ options. */
+ size_t opt_index;
+ const char *arg;
+ int value;
+} cl_deferred_option;
+DEF_VEC_O(cl_deferred_option);
+DEF_VEC_ALLOC_O(cl_deferred_option,heap);
+
+/* Structure describing a single option-handling callback. */
+
+struct cl_option_handler_func
+{
+ /* The function called to handle the option. */
+ bool (*handler) (struct gcc_options *opts,
+ struct gcc_options *opts_set,
+ const struct cl_decoded_option *decoded,
+ unsigned int lang_mask, int kind, location_t loc,
+ const struct cl_option_handlers *handlers,
+ diagnostic_context *dc);
+
+ /* The mask that must have some bit in common with the flags for the
+ option for this particular handler to be used. */
+ unsigned int mask;
+};
+
+/* Structure describing the callbacks used in handling options. */
+
+struct cl_option_handlers
+{
+ /* Callback for an unknown option to determine whether to give an
+ error for it, and possibly store information to diagnose the
+ option at a later point. Return true if an error should be
+ given, false otherwise. */
+ bool (*unknown_option_callback) (const struct cl_decoded_option *decoded);
+
+ /* Callback to handle, and possibly diagnose, an option for another
+ language. */
+ void (*wrong_lang_callback) (const struct cl_decoded_option *decoded,
+ unsigned int lang_mask);
+
+ /* The number of individual handlers. */
+ size_t num_handlers;
+
+ /* The handlers themselves. */
+ struct cl_option_handler_func handlers[3];
+};