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Re: expand-before-require bug

From: Bruno Haible
Subject: Re: expand-before-require bug
Date: Fri, 23 Jan 2009 12:18:14 +0100
User-agent: KMail/1.9.9

Paolo Bonzini wrote:
> >   - macros defined with AC_DEFUN_IDEMPOTENT are *known* to be expandable
> >     any number of times, hence they may be both invoked and required,
> > 
> >   - macros defined with AC_DEFUN_ONCE are *known* to be expandable only
> >     once, hence the recommendation for them is to AC_REQUIRE them,
> Do we have any of these?  I'd just change AC_DEFUN_ONCE to the meaning
> you suggest for AC_DEFUN_IDEMPOTENT

It's too late for doing that: AC_DEFUN_ONCE was introduced on 2004-10-11.

Besides that, AC_DEFUN_ONCE and AC_DEFUN_IDEMPOTENT have really opposite
semantics. You cannot confuse people more than by using the same name for
two entities with opposite semantics.


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