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Re: tests: work around Tru64 sh -e issues for instspc*.test.

From: Eric Blake
Subject: Re: tests: work around Tru64 sh -e issues for instspc*.test.
Date: Thu, 20 Jan 2011 14:01:15 -0700
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On 01/20/2011 01:50 PM, Ralf Wildenhues wrote:
> Ahh, but it would have needed to be in that very patch, unfortunately.
> As it is, my last patch fixed Tru64, but regressed NetBSD by roughly the
> same number of failures, because `unset NOT_SET' fails there.

But bash 2.05a would dump core on 'unset NOT_SET', as documented in the
autoconf manual.  So the portable workaround that should keep NetBSD's
sh -e happy is:

foo=; unset foo

if you aren't sure in advance whether foo is set.

$ /bin/sh -ce 'unset foo; echo hi'
$ /bin/sh -ce 'foo=; unset foo; echo hi'

Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library

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