lib/47120: libc alloca(3) seems to fail

[sdaoden%gmail.com@localhost]

>Number:         47120
>Category:       lib
>Synopsis:       libc alloca(3) seems to fail
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Oct 24 16:40:00 +0000 2012
>Originator:     Steffen
>Release:        6.0
>Organization:
>Environment:
NetBSD nbsd6 6.0 NetBSD 6.0 (GENERIC) i386
(running an old VirtualBox: 4.1.8, r75467)
>Description:
When compiled in a way that gcc(1) builtin alloca() is used the program doesn't 
show any error, but if the libc version is used the returned buffer is trashed 
in an otherwise unmodified environment.
>How-To-Repeat:
Download S-nail(1), branch *next* (or 
http://sourceforge.net/projects/s-nail/files/s-nail-current.tar.gz/download).
Sorry but i don't know any other way to reproduce this error.

Run "$ make DESTDIR=bad CFLAGS='-O2 -std=c89' install; make distclean; make 
DESTDIR=good CFLAGS='-O3 -std=c89' install".

Run "$ MAILRC=/dev/null {bad,good}/usr/local/bin/s-nail -nf" and simply "p" the 
mail of the following minimal mailbox (any mail did in tests though):

From S-Postman Thu May 10 20:40:54 2012
From: <1234567890%abc.com@localhost>
To: <recei%ver.com@localhost>
Subject: Example mail
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0

I agree it has nothing to do with tz, so wouldn't it have been more conside=
rate not to send it?
>Fix: