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Re: how to disable caching of result

From: Matthias Czapla
Subject: Re: how to disable caching of result
Date: Tue, 6 Apr 2004 02:38:29 +0200
User-agent: Mutt/1.3.28i

On Mon, Apr 05, 2004 at 07:28:18PM -0500, Bob Friesenhahn wrote:
> On Tue, 6 Apr 2004, Matthias Czapla wrote:
> > because the result of the first test is cached. How can I tell
> > autoconf to forget the result of the first test before doing it
> > the second time?
> If you look in config.status you will see the form that the cached
> values take.  You can then unset the cache variable that autoconf uses
> before trying again.  Here is some example code taken from one of my
> configure scripts:
>     have_libdps='no'
>     LIBDPS_XT=''
>     AC_CHECK_LIB(dps,DPSInitialize,have_libdps='yes',have_libdps='no',)
>     if test "$have_libdps" != 'yes'
>     then
>       # Unset cache variable so we can try again.
>       unset ac_cv_lib_dps_DPSInitialize
>       AC_CHECK_LIB(dps,DPSInitialize,have_libdps='yes',have_libdps='no',-lXt)
>       if test "$have_libdps" = 'yes'
>       then
>         LIBDPS_XT='-lXt'
>       fi
>     fi

Ok, that works but Ive heard that unset is not portable.


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