* Makefile.in (CPPLIB_H): New, so that dependencies on cpplib.h
	are also on line-map.h.
	* cppfiles.c (stack_include_file): Update.
	* cpphash.h (struct cpp_buffer): New member return_at_eof.
	(_cpp_pop_buffer): New.
	* cppinit.c (cpp_destroy, cpp_finish): Update.
	(do_includes): Mark each buffer to return at EOF.
	* cpplex.c (_cpp_lex_token): Pop buffers at EOF.  Continue or
	return as requested.
	* cpplib.c (run_directive, do_line, cpp_push_buffer): Update.
	(cpp_pop_buffer): Rename _cpp_pop_buffer.  Stop skipping.
	* cpplib.h (cpp_pop_buffer): Remove.
	(cpp_scan_buffer_nooutput): Rename cpp_scan_nooutput.
	* cppmacro.c (cpp_scan_buffer_nooutput): Similarly.  No need to pop
	buffers.
	* cppmain.c (scan_buffer): Rename scan_translation_unit.  No need
	to pop buffers.
	(do_preprocessing): Update.
	* fix-header.c (read_scan_file): Update.  No need to pop buffers.
	* c-parse.in (_yylex): Similarly.
	* scan-decls.c (scan_decls): Similarly.
	* line-map.h: Update comments.

	* cp/spew.c (read_token): No need to pop buffers.

	* objc/Make-lang.in (objc-act.o): Update dependencies.

From-SVN: r44634