Path: utzoo!attcan!uunet!cs.dal.ca!aucs!880716a
From: 880716a@aucs.uucp (Dave Astels)
Newsgroups: comp.lang.c
Subject: Re: lex & yacc - cupla questions
Keywords: lex yacc
Message-ID: <1990Jul27.185058.6257@aucs.uucp>
Date: 27 Jul 90 18:50:58 GMT
References: <1990Jul26.175545.959@uicbert.eecs.uic.edu>
Reply-To: 880716a@aucs.UUCP (Dave Astels)
Distribution: comp
Organization: School of Computer Science, Acadia Univ., Nova Scotia
Lines: 30

In article <1990Jul26.175545.959@uicbert.eecs.uic.edu> woodward@uicbert.eecs.uic.edu writes:
>2.)  how can one get the automagically-defined #defines, which can
>normally be created from yacc with the -d flag, to come out when you
>use a makefile?  i.e. suppose i have lex.l and yacc.y lex and yacc
>source files, respectively, and i have object files defined in my makefile 
>called lex.o and yacc.o such that "make" follows default rules to create 
>these from the aforementioned source files.

Check your implementation of MAKE for the rule to go from .y to .o
there should be a macro YACCFLAGS or such.  Add a '-d' to that (in the
default file or maybe your makefile.

>3.)  if i have a yacc construct such as:
> 
>line3	: 	A B C
>		{  yacc action sequence }
>
>how can i now assign the values of A, B, and C into local vars of my
>choice?  the problem lies in the fact that each of A B and C represent
>three calls to lex, and if i pass back a pointer to yytext[] from lex, 
>i only retain the value of the last token in the sequence, in this case C, 
>when i get to the action sequence in my yacc code.

return a copy of yytext, not a pointer to it.

-- 
"I liked him better before he died" - McCoy, ST V
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Dave Astels            |  Internet: 880716a@AcadiaU.CA
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