Re: aclocal: warning: AC_CANONICAL_HOST invoked multiple times

[Sam Steingold]

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Eric Blake wrote:
> According to Sam Steingold on 10/17/2007 10:14 AM:
>> I get the following warning:
> 
>> aclocal -I `pwd`/src/m4 -I `pwd`/src/glm4 \
>>         --output=src/autoconf/aclocal.m4
>> configure.ac:87: warning: AC_CANONICAL_BUILD invoked multiple times
> ...
>> how do I avoid this warning?
> 
> Generally, these sorts of errors can be avoided by using
> AC_REQUIRE([AC_CANONICAL_BUILD]) rather than flat-out invoking
> AC_CANONICAL_BUILD.
> 
> On the other hand, this ChangeLog may shed some light on the matter:
> 2005-08-26  Stepan Kasal  <address@hidden>
>       * lib/autoconf/general.m4 (AC_CANONICAL_BUILD, AC_CANONICAL_HOST,
>       AC_CANONICAL_TARGET): Define by AC_DEFUN, no need to use AC_DEFUN_ONCE;
>       but change the m4_divert_text to m4_divert_once.
> 
> The message is printed by AC_DEFUN_ONCE, but the current git sources of
> Autoconf don't use that any more as of the above-mentioned change.  So my
> guess is that you are still using autoconf 2.59 instead of 2.61.

indeed I am using 2.59 which comes with fc.
it is frustrating to see that an allegedly "bleeding edge" distribution
comes with 2-4 y.o. releases...

thanks for your help, you did clarify things quite a bit.

actually, this (and others like this) error may stem from the fact that
I am generating aclocal.m4 from _many_ configure.in (one top-level plus
one for each optional module) files by concatenating them together and
passing the result as configure.in argument to aclocal.
this is clearly suboptimal, so I was wondering whether there is a
standard way to merge aclocal.m4 files generated from different
configure.in files.

thanks
Sam
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