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Re: Use pipe and sed in configure.ac
From: |
Eric Blake |
Subject: |
Re: Use pipe and sed in configure.ac |
Date: |
Thu, 10 Feb 2011 12:20:51 -0700 |
User-agent: |
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On 02/10/2011 12:05 PM, Ralf Wildenhues wrote:
> Hello Lyre,
>
> * Lyre wrote on Thu, Feb 10, 2011 at 04:39:41AM CET:
>> php-config --configure-options | sed -n
>> 's|.*--with-config-file-scan-dir=\([^ ]*\).*|\1|p'
>>
>> It works on shell, and outputs "/etc/php5/conf.d/" on opensuse.
>>
>> And I tired it in configure.ac, as following:
>>
>> PHPCDIR=`php-config --configure-options | sed -n
>> 's|.*--with-config-file-scan-dir=\([^ ]*\).*|\1|p'`
>
>> After subsitution in Makefile, the PHPCDIR is empty, meanwhile PHPINC get
>> the correct result.
>
> Probably, m4 eat your [ ] as they are also m4 quotes. To safely protect
> them from m4, replace them with @<:@ and @:>@, respectively. See "info
> Autoconf Quadrigraphs".
Oh, thanks for spotting it! Yes, that's exactly what happened, and what
I missed as I was reading it.
Another option is to add an extra layer of quoting around raw shell code
that should not be subject to m4 processing:
[
PHPCDIR=`...[^ ]...`
]
instead of resorting to quadrigraphs. It has the added benefit that you
retain copy-and-paste capabilities between configure.ac and your shell.
--
Eric Blake address@hidden +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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