* lang-specs.h (c++-cpp-output): Pass -fpreprocessed.

	* lex.c (token_getch, token_put_back): New fns.
	(real_yylex): Use them.

	* lex.c (lang_init): Generalize.
	(lang_init_options): Tell cpplib this is C++.
	(nextchar): Remove.  Replace uses with put_back.
	(skip_white_space): Handle linemode here.  Optimize for cpplib.
	(extend_token_buffer_to): New fn.
	(extend_token_buffer): Use it.
	(read_line_number, check_newline): Just deal with tokens.
	(real_yylex): More cpplib optimizations.  Simplify.  Don't produce
	EXTERN_LANG_STRING, LEFT_RIGHT or PAREN_STAR_PAREN here.
	* spew.c (yylex): Produce LEFT_RIGHT and EXTERN_LANG_STRING.
	* parse.y (PAREN_STAR_PAREN): Remove.
	* input.c: Don't use the putback machinery with cpplib.
	(sub_getch): Fold back into getch.
	(getch): Don't handle linemode here.
	(feed_input): Unget any text in the token buffer.

	* lex.c	(set_typedecl_interface_info, set_vardecl_interface_info,
	nextyychar, nextyylval): Remove.

	* lex.c (indent_level): New variable.
	(init_parse): Set cpp_token to CPP_DIRECTIVE.
	(consume_string): Make this smart about USE_CPPLIB.
	(yyungetc): Use put_back function.
	(pragma_getc, pragma_ungetc): Functions deleted.
	(check_newline): Rewrite to be intelligent about USE_CPPLIB.
	Also, call HANDLE_PRAGMA with getch, yyungetc, not pragma_getc and
	pragma_ungetc.
	(real_yylex): Rewrite to be intelligent about USE_CPPLIB.
	Also, clean up cases where we redundantly set token_buffer[0].
	(read_line_number): New fn.
	* input.c (feed_input): Use integrated cpplib if USE_CPPLIB.
	(end_input): Call cpp_pop_buffer if USE_CPPLIB.
	(sub_getch): Conditionalize out code that's not appropriate if
	USE_CPPLIB.
	(put_back): Rewrite in case USE_CPPLIB is defined.
	(input_redirected): Ditto.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@28193 138bc75d-0d04-0410-961f-82ee72b054a4

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