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Re: How to retrieve an absolute path in this case?

From: Eric Blake
Subject: Re: How to retrieve an absolute path in this case?
Date: Fri, 26 Mar 2010 08:38:42 -0600
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On 03/25/2010 11:47 AM, ant1scene wrote:
> Hello. 
> I need lookup config's path in application. 
> Tried as is: 
> (fragment)
> AC_DEFINE_UNQUOTED(PREFIX, $prefix, [Install prefix])
> AC_DEFINE_UNQUOTED(SERVER_CONFIG_FILE, "${sysconfdir}/foo.conf",
>       [Location of the config file])
> --
> but, after running 'configure' I'm getting such config.h:
> #define SERVER_CONFIG_FILE "${prefix}/etc/foo.conf"
> #define PREFIX /usr
> what to do to retrieve ${prefix} in SERVER_CONFIG_FILE?

Here's what the manuals have to say about it:

Here's how gnulib does it:

In short, _don't_ use AC_DEFINE_UNQUOTED.  Doing it a configure time is
too early, and does not have enough levels of expansion.  Instead, use
AC_SUBST, and modify your Makefile.{am,in} (depending on whether you use
automake) to do the substitution at make time.

Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library

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