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Date: Tue, 20 May 2008 02:51:21 -0500
From: Dave Uhring <duhring@charter.net>
To: Mark Andrews <Mark_Andrews@isc.org>
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References: <200805200324.m4K3Ow5J030607@drugs.dv.isc.org>
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Subject: Re: Buildworld Fails RELENG_7
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On Tue, May 20, 2008 at 01:33:15PM +1000, Mark Andrews wrote:
> 
> 	And when tested does behave the way you describe.
> 
> 	Mark
> 
> drugs:9.5.x 13:30 {4371} % bash
> [marka@drugs ~/cvs/9.5.x]$ printenv | grep FOO
> [marka@drugs ~/cvs/9.5.x]$ FOO=ll
> [marka@drugs ~/cvs/9.5.x]$ export FOO
> [marka@drugs ~/cvs/9.5.x]$ printenv | grep FOO
> FOO=ll
> [marka@drugs ~/cvs/9.5.x]$ FOO=""
> [marka@drugs ~/cvs/9.5.x]$ export FOO
> [marka@drugs ~/cvs/9.5.x]$ printenv | grep FOO
> FOO=
> [marka@drugs ~/cvs/9.5.x]$ env -i PATH=$PATH printenv | grep FOO
> [marka@drugs ~/cvs/9.5.x]$ 

This is Solaris but bash is bash:

[duhring@einstein ~]$ printenv | grep CFLAGS
CFLAGS=-xO3 -m32 -xarch=native -mt  -I/usr/sfw/include -I/usr/X11/include -I/opt/sfw/include
You have mail in /var/mail/duhring
[duhring@einstein ~]$ export CFLAGS=""
[duhring@einstein ~]$ printenv | grep CFLAGS
CFLAGS=
[duhring@einstein ~]$ export CFLAGS='-xO3 -m32 -xarch=native'
[duhring@einstein ~]$ printenv | grep CFLAGS
CFLAGS=-xO3 -m32 -xarch=native
[duhring@einstein ~]$ export CFLAGS=""
[duhring@einstein ~]$ printenv | grep CFLAGS
CFLAGS=
[duhring@einstein ~]$ env -i PATH=$PATH printenv | grep CFLAGS
[duhring@einstein ~]$ 

When I tell you that CFLAGS="", CFLAGS="", and a cursory
examination of my last compiler output would have shown you exactly
that.