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From: Terry Lambert <terry@lambert.org>
Message-Id: <199603292156.OAA06249@phaeton.artisoft.com>
Subject: Re: Flex - Reply  - Reply
To: DARREND@novell.com (Darren Davis)
Date: Fri, 29 Mar 1996 14:56:36 -0700 (MST)
Cc: DARREND@novell.com, leisner@sdsp.mc.xerox.com, hackers@freebsd.org,
        narvi@haldjas.folklore.ee, terry@lambert.org
In-Reply-To: <s15bc5c7.012@fromGW> from "Darren Davis" at Mar 29, 96 10:47:33 am
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> Yes, I allready tried the -l option with about the same effect.
> bash$ lex -V
> lex version 2.4.7
> bash$ 
> 
> bash$ make
> lex -l -n -t ./scanner.l >scanner.c
> cc -c -O -DBSD -ansi -w  scanner.c
> ./scanner.l: In function `yylex':
> ./scanner.l:113: `yysptr' undeclared (first use this function)

Looks like a bogus %union in your yacc grammer, or your yacc not being
done before your lex.

%union {
	char	*yysptr;
	char	yytcharl
	char	yysbuf[ SOMEBUFSIZE];
%}

Might be a partial fix...

> ./scanner.l:113: (Each undeclared identifier is reported only once
> ./scanner.l:113: for each function it appears in.)
> ./scanner.l:400: `yytchar' undeclared (first use this function)
> ./scanner.l:400: `yysbuf' undeclared (first use this function)
> ./scanner.l: At top level:

[ ... ]

> ./scanner.l:932: parse error before `='
> ./scanner.l:937: conflicting types for `yy_c_buf_p'
> scanner.c:203: previous declaration of `yy_c_buf_p'

I've seen these exact warning in an uncorrected "parse a command line"
lexer in the O'Reilly "lex & yacc" book; fixes are in appendix E of
that same book...

[ ... type conflicts ... ]

generally the result of '=' constructs in the yacc grammar.  See the
differences in the O'reilly sample code for flex vs. lex for the
chapter 5 examples.  Sample code may be obtained from uunet in the
O'Reilly publication section.

> I do not get a single error while compiling this under UnixWare 2.1 (no
> surprise.)

Yeah; flex also does not support yylineno -- it's undocumented and
it's not POSIX.


					Terry Lambert
					terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.