* c-common.c (c_common_init): Call preprocess_file instead.
	(c_common_finish): Move to c-opts.c.
	* c-common.h (preprocess_file): new.
	* c-opts.c (out_fname, out_stream, deps_append, preprocess_file,
	check_deps_environment_vars, c_common_finish): New.
	(c_common_decode_option): Update for out_fname and dependencies.
	* cppinit.c (init_dependency_output, output_deps): Remove.
	(cpp_destroy): Update prototype.
	(cpp_add_dependency_target): New.
	(cpp_read_main_file): Don't overlay a buffer.
	(cpp_finish): Take a deps output stream and write deps to it.
	Return the error count.
	(cpp_post_options): Don't canonicalize out_fname, or do anything
	with dependencies.
	* cpplib.h (struct cpp_options): Remove out_fname and
	preprocess_only.
	(cpp_add_dependency_target): New.
	(cpp_destroy, cpp_finish, cpp_preprocess_file): Update.
	* cppmain.c (cpp_preprocess_file): Update prototype.  Don't
	set preprocess_only.  Don't handle the output stream directly.

From-SVN: r56214