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Re: static library as fallback
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From: |
Eric Blake |
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Subject: |
Re: static library as fallback |
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Date: |
Mon, 13 Jun 2011 17:43:34 -0600 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110428 Fedora/3.1.10-1.fc14 Lightning/1.0b3pre Mnenhy/0.8.3 Thunderbird/3.1.10 |
On 06/13/2011 04:05 PM, Sergio Belkin wrote:
> I have the following sentence in a configure.ac:
>
> AC_SEARCH_LIBS(ns_initparse,resolv)
>
> The problem is ns_initparse is missing on old releases of libresolv.so
> eg: on Centos 5.
>
> So I'd want to make static resolv as a fallback, Can I do it with
> AC_SEARCH_LIBS?
Of course, by using the action-if-not-found argument to declare a
witness preprocessor macro. Something like this (untested, and adding
recommended m4 quoting):
AC_SEARCH_LIBS([ns_initparse], [resolv], [],
[AC_DEFINE([MISSING_NS_INITPARSE], [1], [Define to 1 if ns_initparse
is not available in any library])])
Then in your C code:
#if MISSING_NS_INITPARSE
// implement your static ns_initparse instead
#endif
--
Eric Blake address@hidden +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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