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Re: AC_DEFUN_ONCE semantics

From: Ralf Wildenhues
Subject: Re: AC_DEFUN_ONCE semantics
Date: Mon, 26 Jan 2009 20:02:58 +0100
User-agent: Mutt/1.5.18 (2008-05-17)

Hi Eric,

* Eric Blake wrote on Mon, Jan 26, 2009 at 06:09:28PM CET:
> * lib/m4sugar/m4sugar.m4 (m4_defun_once): Rewrite to be no-op,
> rather than warning, on second use, and make sure first use never
> occurs out of order.

This means that the user may practically never directly call a
defun_once'd macro within a shell conditional, right?  Sounds
like a backward incompatibility to me, hopefully a small one.


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