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Re: [configure bug while building] flex beta version 2.5.15

From: Bruce Lilly
Subject: Re: [configure bug while building] flex beta version 2.5.15
Date: Sun, 01 Sep 2002 10:44:31 -0400
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.0) Gecko/20020529

Paul Eggert wrote:
Date: Fri, 30 Aug 2002 22:58:59 -0400
From: Bruce Lilly <address@hidden>

It was reported as a bug in the bison 1.33 configure
script ca. 22 Feb 2002.

Thanks, I found that bug report in

I don't understand the IFS problem that it mentions.  The current CVS
Autoconf outputs a script that sets IFS to space, tab, newline early
on.  Perhaps you were using an older Autoconf that didn't do that?

FWIW, that configure script says:

# Generated by GNU Autoconf 2.52h for GNU Bison 1.33.

I haven't seen the IFS problem in other configure scripts
recently, so maybe it has been fixed, or maybe there was
another issue with that particular shell.

Also, the bug report mentioned PS3, but I'd rather leave PS3 alone as
it's not specified by POSIX 1003.1-2001.  Portable scripts don't use
"select" and don't rely on $? from "select", so I don't think PS3 is a
real problem.

I think PS1 was the real problem.  Resetting or unsetting PS2 etc.
ought not to cause trouble but probably isn't critically important.

However, I think ENV, MAIL, and MAILPATH should be unset, as they
might cause similar problems with a buggy shell like the one that you

I haven't seen problems with these, but unsetting them in
the script shouldn't cause any problems.

Thanks & best regards,
  Bruce Lilly

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