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Re: Question about ac_lib and ac_res
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From: |
Eric Blake |
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Subject: |
Re: Question about ac_lib and ac_res |
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Date: |
Thu, 18 Oct 2012 10:23:01 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121009 Thunderbird/16.0 |
On 10/18/2012 10:11 AM, Sergio Belkin wrote:
>
> Thanks for you explanation, I didn''t understand well what does "none
> required".
>
> I've found "The result of this test is cached in the
> ac_cv_search_function variable as ‘none required’ if function is
> already available" at
> http://www.manpagez.com/info/autoconf/autoconf-2.69/autoconf_46.php
>
> So I understand that function was found in the library searched on in
> another in the system, wasn't it?
For an example, on cygwin, sin() is in libc, but on other platforms, you
have to use libm to get sin(). So:
AC_SEARCH_LIBS([sin], [m])
will set ac_cv_search_sin to 'none required' on cygwin, and '-lm' on
other platforms.
--
Eric Blake address@hidden +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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