c.opt (Wcomment): Use CPP, Var and LangEnabledBy.

c.opt (Wcomment): Use CPP, Var and LangEnabledBy.

gcc/c-family/ChangeLog:

2014-08-22  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	* c.opt (Wcomment): Use CPP, Var and LangEnabledBy.
	(Wmultichar): Likewise.
	(Wdate-time): Use C-family languages instead of Common. Use CPP
	and Var.
	* c-opts.c (c_common_handle_option): Do not handle the above
	options here.
	(sanitize_cpp_opts): Likewise.

gcc/testsuite/ChangeLog:

2014-08-22  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	* g++.dg/warn/wdate-time.C: Remove.
	* gcc.dg/wdate-time.c: Move from here...
	* c-c++-common/wdate-time.c: ... to here.

From-SVN: r214350