Path: utzoo!attcan!utgpu!watmath!iuvax!mailrus!cornell!vern
From: vern@bifrost.cs.cornell.edu (Vern Paxson)
Newsgroups: comp.sources.d
Subject: Re: flex question:  yy_act used before set
Keywords: flex
Message-ID: <32356@cornell.UUCP>
Date: 21 Sep 89 19:11:00 GMT
References: <732@larry.sal.wisc.edu>
Reply-To: vern@cs.cornell.edu (Vern Paxson)
Organization: Cornell Univ. CS Dept, Ithaca NY
Lines: 20

In article <732@larry.sal.wisc.edu> jwp@larry.sal.wisc.edu (Jeffrey W Percival) writes:
>I tried using flex instead of lex, and tried lint on my lex.yy.c file.
>It said (among other things) that yy_act may be used before set.  A
>look at lex.yy.c shows that this is the case.
>
>What's the deal here?

I believe this is completely harmless (i.e., the variable is actually
never used before it is set).  I say "believed" because I could not
get it to reproduce using the current version of flex, though I remember
seeing it in the past and convincing myself that it was OK.  If you
feel pretty certain that the variable *is* getting used before it's
set, please email me the flex input and output and I'll have a look
at it.

		Vern

	Vern Paxson			      vern@cs.cornell.edu
	Computer Science Dept.		      decvax!cornell!vern
	Cornell University