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From: sja@sirius.hut.fi (Sakari Jalovaara)
Newsgroups: comp.compilers
Subject: Re: Two pass compiler using YACC?
Keywords: C, yacc
Message-ID: <1990Aug25.170408.29508@santra.uucp>
Date: 26 Aug 90 00:03:44 GMT
References: <9008242036.AA10670@virgil.tfic.bc.ca>
Sender: compilers-sender@esegue.segue.boston.ma.us
Reply-To: sja@sirius.hut.fi (Sakari Jalovaara)
Organization: Helsinki University of Technology
Lines: 30
Approved: compilers@esegue.segue.boston.ma.us
In-Reply-To: tbr@virgil.tfic.bc.ca's message of 24 Aug 90 20:36:19 GMT

>>The problems come during link-time, for ld, obviously, complains about
>>multiple defined symbols (such as yylval and yyparse).

[solution with a sed script]

How about an include file, say, yyrename.h (warning - untested code
ahead):

	#define yyGLUE1(x,y) x ## y
	#define yyGLUE(x,y)  yyGLUE1 (x, y) /* There may be an
					     * easier way...
					     */
	#define yyparse   yyGLUE (yyparsername,_yyparse)
	#define yylex     yyGLUE (yyparsername,_yylex)
	#define yychar    yyGLUE (yyparsername,_yychar)
	...etc...

and in parse.y:

	%{
	#define yyparsername my_parser
	#include "yyrename.h"

	my_parser_yylex () { ...lexer goes here... }
	%}
									++sja
[No question, there are arbitrarily ugly ways to make this work. -John]
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