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Message-Id:	<200507222016.j6MKGTXI053801@crag.niss.com>
From:	Scott Bolte <listS+cygwin AT niss DOT com>
To:	Michael G Schwern <schwern AT pobox DOT com>
cc:	Andrew Ho <andrew AT tellme DOT com>, "Gerrit P. Haase" <gerrit AT familiehaase DOT de>,
	cygwin AT cygwin DOT com, makemaker AT perl DOT org, perl5-porters AT perl DOT org,
	petdance AT cpan DOT org
Subject:	Re: [perl-5.8.7] Perl regression tests fail when lib directory is present
MIME-Version:	1.0
Date:	Fri, 22 Jul 2005 15:16:29 -0500
X-IsSubscribed:	yes

On Thu, 21 Jul 2005 00:14:51 -0700, Michael G Schwern wrote:
>  
> Its gotta be something about _default_inc().  Nothing looks wrong from
> here.  My only guess is that local $ENV{PERL5LIB} is ineffective.  That
> would account for the alternation.

	It's not just the local scoping. There is something
	seriously unexpected with environment variables, perl
	and cygwin.

		----- th4.pl
		#!/usr/bin/perl
		use strict;
		use warnings;
		 
		$ENV{SHOULD_NEVER_BE_SEEN} = "hello world";
		delete($ENV{SHOULD_NEVER_BE_SEEN});
		system("printenv | grep SHOULD_NEVER_BE_SEEN");

	On UNIX systems that script properly prints nothing. Not so
	on my cygwin (on top of XP) system:

		cygwin% perl ~/th4.pl
		SHOULD_NEVER_BE_SEEN=hello world

	It seems to imply that the results of unsetenv(3) are not
	persistent across an exec(2).

	Root cause aside, you nailed it with your suggestion.

>		....
>
> And then try changing "local $ENV{PERL5LIB}" to "local $ENV{PERL5LIB} = ''".

	Explicitly setting $ENV{PERL5LIB} to '' before calling `perl ...`
	in _default_inc() fixed the problem for me.

		Scott

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