Re: preparation for expand-before-require warning

[Paolo Bonzini]

> Or maybe you are implying one step even further, where AC_REQUIRE becomes
> optional, and all zero-argument defun'd macros are implicitly required,

... instead of expanded in the output flow (unless at toplevel) ...

> with no effort from the user?

Yes, like that, though not automagically.  You'd have do use a separate
macro to define these AC_REQUIRE-only macros (which could actually be
m4_defun_once itself).

> But all of this seems like it should
> probably be delayed to post-2.64.

Yes.

Paolo