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Re: autoconf 2.61: AC_DEFINE variable with parenthesis
From: |
Stepan Kasal |
Subject: |
Re: autoconf 2.61: AC_DEFINE variable with parenthesis |
Date: |
Tue, 19 Dec 2006 12:32:04 +0100 |
User-agent: |
Mutt/1.4.2.1i |
Hello,
On Mon, Dec 18, 2006 at 01:29:54PM -0800, Paul Eggert wrote:
> >> > AC_DEFINE([DEF(x)], [somevalue])
> >>
> >> Ouch! That's not supported, and I'm surprised you got it to work as
> >> well as it did.
> >
> > status.m4 contains a code which supports this, so until now I had no
> > idea that this may be deprecated. I think this feature was available
> > since the beginning of Autoconf.
>
> When you say "this", do you mean AC_DEFINE([DEF(x)], [somevalue]),
> or do you mean merely putting something like this into config.h.in:
>
> #define DEF(x) somevalue
>
> and having 'configure' ignore it if DEF is not otherwise affected by
> substitutions?
I meant the former; the sed script which creates conftest.defines
from confdefs.h has a special code to understand macros with
parameters. After some digging in the CVS, I found out that this
code was added to acgeneral.m4 rel. 1.261, dated 1999-10-30, "merged
from the experimental branch".
So the feature, though undocumented, was there for 7 years.
OTOH, I see that the use of it is very limited.
> AC_DEFINE([DEF(x], [) x])
No, I do not care about this, of course. But I think that
AC_DEFINE([DEF(x)], [somevalue])
is quite natural.
I'm not sure whether deprecate it or not; unless new reasons appear,
let's leave it deprecated.
The sitation with templates is clear, OTOH: anything but "#undef FOO"
is deprecated. (I plan to fix the regression, though.)
Stepan
- Re: autoconf 2.61: AC_DEFINE variable with parenthesis, Paul Eggert, 2006/12/15
- Re: autoconf 2.61: AC_DEFINE variable with parenthesis, Stepan Kasal, 2006/12/18
- Re: autoconf 2.61: AC_DEFINE variable with parenthesis, Steven G. Johnson, 2006/12/25
- Re: autoconf 2.61: AC_DEFINE variable with parenthesis, Paul Eggert, 2006/12/26
- Re: autoconf 2.61: AC_DEFINE variable with parenthesis, Steven G. Johnson, 2006/12/26
- Re: autoconf 2.61: AC_DEFINE variable with parenthesis, Paul Eggert, 2006/12/27
- Message not available
- Re: autoconf 2.61: AC_DEFINE variable with parenthesis, Paul Eggert, 2006/12/28
- Re: autoconf 2.61: AC_DEFINE variable with parenthesis, Steven G. Johnson, 2006/12/28
- Re: autoconf 2.61: AC_DEFINE variable with parenthesis, Paul Eggert, 2006/12/29