libcpp/
	PR preprocessor/13726
	* directives.c (check_eol_return_comments): New static function.
	(parse_include): Add buf parameter.  Change all callers.
	(do_include_common): If not discard comments, turn on
	save_comments.  Pass collected comments to include callback.
	* include/cpplib.h (struct cpp_callbacks): Add new parameter to
	include callback: cpp_token list.
gcc/
	PR preprocessor/13726
	* c-ppoutput.c (cb_include): Add comments parameter, and print out
	any comments passed in.
gcc/testsuite/
	PR preprocessor/13726
	* gcc.dg/cpp/cmdlne-dI-C.c: New test.
	* gcc.dg/cpp/cmdlne-dI-C.h: New file.

From-SVN: r104951