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bug#8718: error when using nested conditionals

From: Stefano Lattarini
Subject: bug#8718: error when using nested conditionals
Date: Fri, 10 Jun 2011 13:45:21 +0200
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On Friday 10 June 2011, Bruno Haible wrote:
> Peter,
> > how about the following alternative (for all conditionals, or just for some
> > of them, e.g., those under the regime of AM_IGNORE_UNDEFINED_CONDITIONALS):
> > Replace the AC_MSG_ERROR() above by a warning and set both $1_TRUE and
> > $1_FALSE to something that, when not hidden in a false branch of the
> > Makefile, (1) triggers a make syntax error, and (2) contains sufficient info
> > to deduce the cause for that error.
> Sounds good. But gnulib would also need a way to disable the warning,
> because otherwise the maintainers of packages that use gnulib come back to
> me and ask how they can get rid of the warning.
> Bruno
I like Peter proposal too, it's neat and shouldn't be difficult to implement
and document.  But maybe I like Bruno's latest proposal about adding a third
argument to AM_CONDITIONAL even more; see:
The problem is, how would that scale on more complex situations?  That's not
quite obvious to me.  Peter's proposal seems safer in this regard.

Hmmm, I can't really decide between these two proposals offhand.  Let's wait
a couple of days to see if Ralf can chime in, OK?  Otherwise we'll try to
sort this out ourselves.

For the moment, thank you all for your ideas and contribution.


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