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List:       autoconf-bug
Subject:    Re: configure oddity
From:       Eric Blake <eblake () redhat ! com>
Date:       2011-02-26 14:02:25
Message-ID: 4D6907F1.1060001 () redhat ! com
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On 02/26/2011 05:07 AM, Ralf Wildenhues wrote:
> How about this patch to diagnose such issues early (test case taken from
> gnulib)?  This way you get an error if you run autoconf, aclocal, or
> automake, anywhere in GCC, and the underlying M4 has the problem.

I like the concept, although I can make it shorter.

Autoconf's m4/m4.m4 needs a similar test.

> 2011-02-26  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
> 
> 	* override.m4: Error out if a buggy M4 was detected, to
> 	avoid spurious diffs in generated files.
> 
> diff --git a/config/override.m4 b/config/override.m4
> index fc2d527..9536009 100644
> --- a/config/override.m4
> +++ b/config/override.m4
> @@ -48,6 +48,15 @@ _GCC_AUTOCONF_VERSION_CHECK
>  ])
>  
>  
> +dnl Ensure we do not use a buggy M4.

m4_if(m4_index([..wi.d.], [.d.]), [-1],
  [m4_fatal(...

-- 
Eric Blake   eblake@redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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