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Re: AM_COND_IF for earlier Automake

From: Dave Hart
Subject: Re: AM_COND_IF for earlier Automake
Date: Sun, 19 Dec 2010 15:52:00 +0000

On Sun, Dec 19, 2010 at 14:13 UTC, Ralf Wildenhues
<address@hidden> wrote:
> * Dave Hart wrote on Sun, Dec 19, 2010 at 02:47:58PM CET:
>> On Sun, Dec 19, 2010 at 10:48 UTC, Ralf Wildenhues wrote:
>> > * Dave Hart wrote on Sat, Dec 18, 2010 at 07:57:13PM CET:
>> >> m4_ifndef([AM_COND_IF], [AC_DEFUN([AM_COND_IF],
>> >> [m4_ifndef([$1_TRUE],
>> >>          [m4_fatal([$0: no such condition "$1"])])dnl
>> >> if test -z "$$1_TRUE"; then :
>> >>   m4_n([$2])[]dnl
>> >> m4_ifval([$3],
>> >> [else
>> >>   $3
>> >> ])dnl
>> >> fi[]dnl
>> >> ])])
>> >
>> > Looks ok to me.  If you experience problems later, please report back.
>> When tested as above, my AM_COND_IF replacement was occurring with
>> Automake 1.11, leading me to change the m4_fatal message to make it
>> clear it was coming from a AM_COND_IF imposter.  Substituting
>> m4_define for AC_DEFUN cured the problem.  Is it inappropriate to try
>> to conditionalize AC_DEFUN under m4_ifndef?
> Can you show the error you got, and maybe also a small example how you
> got it?  I'm not sure I fully understand otherwise.
> Normally, AC_DEFUN under m4_ifndef should work ok.  Hmm, you might want
> to move the AC_DEFUN to a new line, as aclocal essentially greps for it.

The error I got was AM_COND_IF: no such condition "..." which was
coming from the replacement AM_COND_IF despite using Automake 1.11.  I
can no longer reproduce that failure, so it was probably a result of
my own misunderstanding.  Now it's working for me with Automake 1.10
and 1.11 with AC_DEFUN on its own line, or combined with the prior.

> With m4_define, you need to ensure yourself that the .m4 file you put
> this in is included in aclocal.m4 (or

Good to know, thanks.  I removed the "no such condition" check because
$1_TRUE is not m4_define()d and I didn't want to get into redefining
AM_CONDITIONAL simply to enable this check in the AM_COND_IF backport.
 Here's what I've hopefully settled on:

dnl AC_CONFIG_FILES conditionalization requires using AM_COND_IF, however
dnl AM_COND_IF is new to Automake 1.11.  To use it on new Automake without
dnl requiring same, a fallback implementation for older Autoconf is provided.
dnl Note that disabling of AC_CONFIG_FILES requires Automake 1.11, this code
dnl is correct only in terms of m4sh generated script.
m4_ifndef([AM_COND_IF], [AC_DEFUN([AM_COND_IF], [
if test -z "$$1_TRUE"; then :

Thanks for all the assistance,
Dave Hart

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