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Re: expand-before-require bug
From: |
Paolo Bonzini |
Subject: |
Re: expand-before-require bug |
Date: |
Fri, 23 Jan 2009 13:06:06 +0100 |
User-agent: |
Thunderbird 2.0.0.19 (Macintosh/20081209) |
Bruno Haible wrote:
> 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.
I know.
> 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.
It looks to me like, in the wild, AC_DEFUN_ONCE is used for idempotent
macros (and in Autoconf too, see AC_CANONICAL_*). The only correct use
of AC_DEFUN_ONCE (where the warning *is* desired) is AC_NO_EXECUTABLES;
and not even fully correct, as you'd want an error there.
You can look at all of them at
http://www.google.com/codesearch?hl=en&sa=N&q=AC_DEFUN_ONCE+-package:autoconf+-file:request+-package:automake+-file:traces*+-file:aclocal*++lang:m4&ct=rr&cs_r=lang:m4
Paolo
- expand-before-require bug, Eric Blake, 2009/01/21
- Re: expand-before-require bug, Eric Blake, 2009/01/21
- Re: expand-before-require bug, Bruno Haible, 2009/01/22
- Re: expand-before-require bug, Paolo Bonzini, 2009/01/23
- Re: expand-before-require bug, Bruno Haible, 2009/01/23
- Re: expand-before-require bug,
Paolo Bonzini <=
- Re: expand-before-require bug, Paolo Bonzini, 2009/01/23
- Re: expand-before-require bug, Eric Blake, 2009/01/23
- Re: expand-before-require bug, Bruno Haible, 2009/01/23
- Re: expand-before-require bug, Eric Blake, 2009/01/23
- Re: expand-before-require bug, Bruno Haible, 2009/01/23
- Re: expand-before-require bug, Eric Blake, 2009/01/25
- Re: expand-before-require bug, Paolo Bonzini, 2009/01/26
- Re: expand-before-require bug, Ralf Wildenhues, 2009/01/26
- Re: expand-before-require bug, Ralf Wildenhues, 2009/01/26
Re: expand-before-require bug, Eric Blake, 2009/01/21