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Re: AC_LIBOBJ with file in subdirectory does not work

From: Ralf Wildenhues
Subject: Re: AC_LIBOBJ with file in subdirectory does not work
Date: Wed, 26 May 2010 07:25:07 +0200
User-agent: Mutt/1.5.20 (2009-10-28)

* Bruno Haible wrote on Wed, May 26, 2010 at 12:11:45AM CEST:
> > I see a few possible alternative ways out:
> > - Automake requires subdir-objects if you put slashes into $LIBOBJS,
> There are cases where the developer does not want 'subdir-objects'.
> I'm having the problem with AC_LIBOBJ in the 
> gettext/gettext-tools/libgettextpo
> directory, and when I enable 'subdir-objects' in this directory, all hell
> breaks loose. Impossible.

Understood.  While I think that libgettextpo isn't such an ideal
example, and would like to see if it's possible to rewrite in a more
automake-ish style, possibly using a symlink farm for the shared source
files, I agree that similar situations may be unavoidable in general
(actually, we have a project that requires not to use subdir-objects

> > - Autoconf optionally removes dirname parts from $LIBOBJS (i.e., some
> >   kind of "subdir-objects" toggle for Autoconf),
> Yes, but that requires Autoconf to receive information from Automake about
> its options. Which is hard because there are several Makefile.ams in the
> scope of a single configure file.

Yep.  Information never flows that way.  For any requirements from
Automake on Autoconf, automake checks whether side conditions are met
and fails otherwise; there are several examples for this (like
requirement of some macro such as AC_PROG_RANLIB), so this is feasible.
But it's ugly, and still won't fix your use case above nicely (unless
you can choose to turn off subdir-objects everywhere).

> > - Automake always enables subdir-objects machinery for the $LIBOBJS
> >   files, but not necessarily for the other files.
> This would be acceptable, yes.
> The other, completely different alternative is to deprecate AC_LIBOBJ.

Yes, I guess.  I'll investigate the feasibility of always assuming
subdir-objects for LIBOBJS only.


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