Re: more fun with m4_expand

[Eric Blake]

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According to Paolo Bonzini on 11/25/2008 7:15 AM:
> Yes, it's things like this (especially the
> diversion-during-argument-collection wart) that make me wonder if it
> *could* ever work at all.

M4 1.6 will enhance the divert builtin:

divert(diversion, [text])

where text, if specified, is dumped into diversion regardless of argument
collection.  But we want to work with m4 1.4.x for some time, still...

> 
> The expand-twice trick in my previous email seems worth pursuing...

But with:

AC_FOO(m4_expand([AC_BAR]))

it is not just the m4_expand that needs to happen twice, but AC_FOO.  In
other words, it seems like m4_expand needs to have the magic which informs
the enclosing m4_defun'd function that m4_expand encountered an
m4_require, so emit the required functions, then restart AC_FOO from
scratch.  Maybe I can make something happen from that idea.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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