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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 13:47:58 +0000

On Sun, Dec 19, 2010 at 10:48 UTC, Ralf Wildenhues
<address@hidden> wrote:
> Hi Dave,
> * 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?

This seems to be doing the right thing on Automake 1.11.  Not yet
tested with older Automake.

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], [m4_define([AM_COND_IF],
           [m4_fatal([$0 backport: no such condition "$1"])])dnl
if test -z "$$1_TRUE"; then :

Thanks again,
Dave Hart

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