Re: expand-before-require bug

[Eric Blake]

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According to Bruno Haible on 1/23/2009 5:26 PM:
> Eric Blake wrote:
>> With the proposal for autoconf 2.64, it can be
>> either invoked or required, in any order, without warning; it guarantees
>> that the expansion only occurs once; and it will never suffer from
>> out-of-order expansion (thanks to the embedded require under the hood).
> 
> Sounds perfect. I can't await to see it running, and backported into
> gnulib-common.m4 :-)

Backporting within gnulib-common.m4 itself won't work - we have to
redefine AC_DEFUN_ONCE before any other gnulib .m4 file that uses it to
define another macro.  Fortunately, Automake collects all m4/*.m4 files in
alphabetical order, so it should be as simple as making a file named
000-gnulib.m4 (or some-such) which is then guaranteed to be included
before any other gnulib m4 file.  Any thoughts on how best to name/include
such a file reliably?

I've got the autoconf side running in my sandbox, and am now working on
the gnulib side.

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

Eric Blake             address@hidden
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