Re: Libtool makes configure scripts check for unneeded compilers

[Bob Friesenhahn]

This fragment was discussed on the libtool list a week or two ago. It
is simply ensuring the ordering of expansion of AC_PROG_CXX and
AC_LIBTOOL_CXX, nothing more.

Bob

On Wed, 11 Jun 2003, Peter Eisentraut wrote:

> Albert Chin writes:
>
> > > And when I run it it checks for g++ and g77 and runs the whole libtool
> > > test range for those compilers.  Does anyone know why?
> >
> > Check the thread from last week. I'll try to post my patch by this
> > weekend to fix this.
> >   http://mail.gnu.org/archive/html/libtool/2003-06/msg00006.html
>
> It seems that the code is already set up to select the right tags
> automatically, but it just doesn't work.  In AC_PROG_LIBTOOL:
>
> dnl If AC_PROG_CXX has already been expanded, run AC_LIBTOOL_CXX
> dnl immediately, otherwise, hook it in at the end of AC_PROG_CXX.
>   AC_PROVIDE_IFELSE([AC_PROG_CXX],
>     [AC_LIBTOOL_CXX],
>     [define([AC_PROG_CXX], defn([AC_PROG_CXX])[AC_LIBTOOL_CXX
>   ])])
>
> This means, if AC_PROG_CXX has already been called, call AC_LIBTOOL_CXX.
> Else, change AC_PROG_CXX to include AC_LIBTOOL_CXX automatically, in case
> it is called later.  But if AC_PROG_CXX is never called, AC_LIBTOOL_CXX
> should also never be called.  But that doesn't happen.  Why?
>
> --
> Peter Eisentraut   address@hidden
>
>
>
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======================================
Bob Friesenhahn
address@hidden
http://www.simplesystems.org/users/bfriesen