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Re: Clarification request: AC_PREFIX_DEFAULT([.]) and AC_CONFIG_SUBDIRS

From: Eric Blake
Subject: Re: Clarification request: AC_PREFIX_DEFAULT([.]) and AC_CONFIG_SUBDIRS collide.
Date: Wed, 03 Dec 2014 06:14:50 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0

On 12/03/2014 04:24 AM, Václav Zeman wrote:
> On 3 December 2014 at 11:32, Thomas Jahns wrote:
>> Hello,
>> I noticed having a default prefix of . causes AC_CONFIG_SUBDIRS to fail.
>> Is this a bug in AC_PREFIX_DEFAULT (or its documentation) or in

>> configure: error: expected an absolute directory name for --prefix: .
>> configure: error: ./configure failed for directory_sub
> I do not know the internals but this does look like a deliberate foot
> shooting preventive measure rather than bug.

install.texi (and therefore INSTALL) documents that --prefix MUST be
absolute.  Using AC_PREFIX_DEFAULT with a non-absolute location is
therefore unwise.  That said, we either need a doc patch to mention this
about AC_PREFIX_DEFAULT, or it may be possible to refactor
AC_PREFIX_DEFAULT to canonicalize the default to be absolute to match
that --prefix must be absolute.  Would you care to write the patch?

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library

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