Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754674AbZGUAOJ (ORCPT ); Mon, 20 Jul 2009 20:14:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754365AbZGUAOI (ORCPT ); Mon, 20 Jul 2009 20:14:08 -0400 Received: from chilli.pcug.org.au ([203.10.76.44]:34684 "EHLO smtps.tip.net.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752391AbZGUAOI (ORCPT ); Mon, 20 Jul 2009 20:14:08 -0400 Date: Tue, 21 Jul 2009 10:13:55 +1000 From: Stephen Rothwell To: Linus Torvalds Cc: Damien Wyart , Greg KH , Wolfgang Walter , linux-kernel@vger.kernel.org Subject: Re: Linux 2.6.30.2: does not boot Message-Id: <20090721101355.c32a0d27.sfr@canb.auug.org.au> In-Reply-To: References: <20090720040813.GC11940@kroah.com> <200907201613.22483.wolfgang.walter@stwm.de> <20090720150916.GB10015@suse.de> <20090720180333.GA2905@brouette> X-Mailer: Sylpheed 2.6.0 (GTK+ 2.16.4; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: multipart/signed; protocol="application/pgp-signature"; micalg="PGP-SHA1"; boundary="Signature=_Tue__21_Jul_2009_10_13_55_+1000_As0gsyLpMMjDjU_g" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1686 Lines: 46 --Signature=_Tue__21_Jul_2009_10_13_55_+1000_As0gsyLpMMjDjU_g Content-Type: text/plain; charset=US-ASCII Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, 20 Jul 2009 11:16:17 -0700 (PDT) Linus Torvalds wrote: > > Why? Many distro's use ccache, and so you may actually get a cached objec= t=20 > file from a previous compile (with a previous compiler). Now, ccache is=20 > pretty good at noticing when things change, and I can well imagine that i= t=20 > also checks the compiler version (in addition to checking the hash of the= =20 > preprocessed output and build flags etc), but I haven't double-checked. >=20 > So to make doubly sure that you really don't end up using cached object=20 > files, you might want to run "ccache -C". ccache includes, in the hash of the preprocessed file, "the real compilers size and modification time", so will probably notice an upgrade or downgrade of the compiler. --=20 Cheers, Stephen Rothwell sfr@canb.auug.org.au http://www.canb.auug.org.au/~sfr/ --Signature=_Tue__21_Jul_2009_10_13_55_+1000_As0gsyLpMMjDjU_g Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAkplCEMACgkQjjKRsyhoI8ylJQCfedyUFWHTyu5k3QQP37+EItBW CLMAnRWZEABEbrqX8sNGLNEold4aX3uN =s8Gy -----END PGP SIGNATURE----- --Signature=_Tue__21_Jul_2009_10_13_55_+1000_As0gsyLpMMjDjU_g-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/