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Re: error: '' is already registered with AC_CONFIG_FILES

From: Eric Blake
Subject: Re: error: '' is already registered with AC_CONFIG_FILES
Date: Fri, 08 Apr 2011 12:16:58 -0600
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On 04/08/2011 12:01 PM, Stephen Henry wrote:
> The construct in which this error appears is:
> AS_IF([test...],
>       ... list of Makefiles in various directories
>       [AS_IF([test...],
>                [
>       ])]
>       ])
> ])

Try swapping your conditionals.  AC_CONFIG_FILES expects literal file
names, but the text "[AS_IF..." is not a literal filename.  Meanwhile,
it is safe to call AC_CONFIG_FILES more than once.

AC_CONFIG_FILES([... list of unconditional makefiles])

> I have verified that the list does not contain duplicate Makefile entries. 
> The configuration script works fine when I remove the [AS_IF] statement, but 
> not when it is included. I am fairly confident that the syntax used is 
> correct and I have removed all trailing whitespace etc... Also, all of the 
> Makefiles have been verified to be in UNIX format.
> I am using autoconf 2.68 and m4 1.4.15.

Consider upgrading to m4 1.4.16; there was a nasty strstr() bug in m4
1.4.15 that has been proven to generate broken configure files in some

Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library

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