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Re: [Qemu-block] [PATCH v2 02/18] configure: Disable W^X on OpenBSD
From: |
Eric Blake |
Subject: |
Re: [Qemu-block] [PATCH v2 02/18] configure: Disable W^X on OpenBSD |
Date: |
Mon, 4 Feb 2019 21:04:30 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 |
On 1/30/19 1:17 AM, Thomas Huth wrote:
>> test ... -a ...
>>
>> is not portable (POSIX permits non-XSI systems to omit support for these
>> operators, but even where they are supported, there are some inherently
>> ambiguous inputs where you CANNOT predict whether the shell will parse
>> -a as a binary operator or as an argument to some other operator).
>> Instead, you should ALWAYS break dual tests into:
>>
>> test ... && test ...
>>
>> instead. (Same for '-o' vs '|| test')
>
> $ grep 'test.* -a ' configure | wc -l
> 21
> $ grep 'test.* && ' configure | wc -l
> 16
>
> Looks like we do not really care?
Well, I care. Enough to propose a patch :)
https://lists.gnu.org/archive/html/qemu-devel/2019-02/msg00960.html
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
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