Allow --specs options.

Allow --specs options.

2012-05-30  Christian Bruel  <christian.bruel@st.com>

	* gcc.c (save_switch): Add user_p parameter.
	(read_specs): Likewise.
	(set_specs): Likewise.
	(validate_switches): Likewise.
	(validate_switches_from_spec): Likewise.
	(validate_all_switches): Pass on user_p parameter.
	(struct spec_list): Add user_p field.
	(struct switchstr): Add known field.
	(save_switch): Add known parameter.
	(INIT_STATIC_SPEC): Initialize user_p;
	(driver_unknown_option_callbac): call save_switch if
	OPT_SPECIAL_unknown.
	(driver_handle_option): Propagate OPT_specs.
	(do_spec_1): Set validated only if known.
	(check_live_switch): Likewise.
	(validate_switches): Set validated if known or user_spec.

From-SVN: r188102