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Re: [PATCH] Replace 'test "${var+set}" = set' with 'test -n "${var+set}"

From: Eric Blake
Subject: Re: [PATCH] Replace 'test "${var+set}" = set' with 'test -n "${var+set}"'
Date: Thu, 09 Apr 2015 06:13:21 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

On 04/09/2015 12:49 AM, Paul Eggert wrote:
> Eric Blake wrote:
>> test ${var+y}
> Hah!  Here's something that's one byte shorter:
> ${var+:} [ ]
> It may be clearer to write it more in the style you used:
> [ ${var+y} ]
> Both of these work with Solaris 10 /bin/sh.

But both become more difficult to express in autoconf, where [] also has
meaning to m4 quoting.

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library

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