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Re: AC_CHECK_HEADER question

From: Eric Blake
Subject: Re: AC_CHECK_HEADER question
Date: Mon, 18 Mar 2013 13:05:14 -0600
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On 03/18/2013 02:50 AM, Jan van Dijk wrote:
> Would it be possible to provide a new macro AC_WHICH_HEADER, say, which 
> informs it user what header has been/will be picked up by the preprocessor? 

I'm not sure that it is a common enough action to need to know where a
header lives.  Knowing that a particular spelling for an include name
compiled should generally be enough.

That said, check out gnulib's m4/absolute-header.m4, which is about as
portable as you can get across multiple compilers at determining the
absolute name for any header's location, provided that header had some
non-trivial content after pre-processing (so headers like <assert.h>
cannot always be found, but headers like <stdio.h> are fair game).

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

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