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Re: PR 34922: fix ./configure --help=recursive

From: Paolo Bonzini <bonzini at gnu dot org>
To: Ralf Wildenhues <Ralf dot Wildenhues at gmx dot de>, gcc-patches at gcc dot gnu dot org
Date: Wed, 23 Jan 2008 10:18:31 +0100
Subject: Re: PR 34922: fix ./configure --help=recursive
References: <20080123063822.GE319@ins.uni-bonn.de>

Ralf Wildenhues wrote:

This makes
  ./configure --help=recursive

work in the toplevel directory.  It is a hack as it uses undocumented
Autoconf variables (ac_subdirs_all) and undocumened diversions
(PARSE_ARGS).  It works with Autoconf 2.59 and current mainline.

Note that, due to a bug in Autoconf 2.59, it will not work outside of
the source tree or an unconfigured tree; i.e.,
  ../gcc/configure --help=recursive

only works after a prior configure run.  This bug has been fixed in
Autoconf mainline.

I would need somebody to review and apply it for me (to both GCC and
src).

I'll do it too.

Paolo

References:
- PR 34922: fix ./configure --help=recursive
  - From: Ralf Wildenhues

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