Re: expand-before-require bug

[Bruno Haible]

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.

Bruno