From: Thomas Dickey <dickey@herndon4.his.com>
To: Alexandre Oliva <aoliva@redhat.com>
Cc: Daniel Jacobowitz <drow@mvista.com>,
Nathanael Nerode <neroden@twcny.rr.com>,
gcc-patches@gcc.gnu.org, gdb-patches@sources.redhat.com,
binutils@sources.redhat.com, dj@redhat.com, autoconf@gnu.org
Subject: Re: (toplevel) introduce host subdir configuration in Makefile
Date: Mon, 02 Dec 2002 14:03:00 -0000 [thread overview]
Message-ID: <20021202220637.GC528@bloatware.reston01.va.comcast.net> (raw)
In-Reply-To: <oru1hwml2i.fsf@free.redhat.lsd.ic.unicamp.br>
On Mon, Dec 02, 2002 at 02:39:49PM -0200, Alexandre Oliva wrote:
> On Dec 2, 2002, Daniel Jacobowitz <drow@mvista.com> wrote:
>
> > You may already know this, but just to be careful I'll mention it
> > anyway... it is not necessarily safe to configure more than one
> > subdirectory at a time. One possibly gotcha is the updating of
> > $cache_file. It isn't done atomically and so if you happen to have two
> > subdirectories with the same (essentially) configure.in, and they
> > happen to get started on an SMP system by make -j2 at (essentially) the
> > same time, you can blow out the cache file.
>
> > This isn't entirely hypothetical. A similar thing happened in
> > libiberty with two invocations of config.status.
>
> This was a bug in autoconf 2.13, that's fixed in autoconf 2.5x.
arguable (as usual). 2.13 didn't pretend to support parallel make.
2.5x pretends to, but (as you note) config.cache isn't handled.
So it appears more as a bug in 2.5x
--
Thomas E. Dickey <dickey@invisible-island.net>
http://invisible-island.net
ftp://invisible-island.net
next prev parent reply other threads:[~2002-12-02 22:03 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-28 14:13 Nathanael Nerode
2002-11-29 8:44 ` Andrew Cagney
2002-12-02 8:18 ` Daniel Jacobowitz
2002-12-02 8:40 ` Alexandre Oliva
2002-12-02 8:52 ` Daniel Jacobowitz
2002-12-02 9:44 ` Alexandre Oliva
2002-12-02 10:23 ` Daniel Jacobowitz
2002-12-02 12:48 ` Alexandre Oliva
2002-12-02 13:43 ` DJ Delorie
2002-12-02 14:03 ` Thomas Dickey [this message]
2002-12-04 0:42 ` Samuel Tardieu
2002-12-04 3:14 ` Thomas E. Dickey
2002-12-02 10:17 ` DJ Delorie
2002-11-29 13:51 Nathanael Nerode
2002-11-29 14:23 ` Andrew Cagney
2002-11-29 14:40 Nathanael Nerode
2002-11-29 15:16 ` Andrew Cagney
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