From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1RCh8G-0007pW-5I for garchives@archives.gentoo.org; Sun, 09 Oct 2011 00:20:44 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id E9BB921C0A8; Sun, 9 Oct 2011 00:20:33 +0000 (UTC) Received: from smtp.gentoo.org (smtp.gentoo.org [140.211.166.183]) by pigeon.gentoo.org (Postfix) with ESMTP id CB45F21C026 for ; Sun, 9 Oct 2011 00:20:07 +0000 (UTC) Received: from mail-vw0-f53.google.com (mail-vw0-f53.google.com [209.85.212.53]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) (Authenticated sender: mattst88) by smtp.gentoo.org (Postfix) with ESMTPSA id 3C5741B4001 for ; Sun, 9 Oct 2011 00:20:07 +0000 (UTC) Received: by vws19 with SMTP id 19so6625623vws.40 for ; Sat, 08 Oct 2011 17:20:05 -0700 (PDT) Received: by 10.52.34.78 with SMTP id x14mr8142920vdi.122.1318119605178; Sat, 08 Oct 2011 17:20:05 -0700 (PDT) Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-dev@lists.gentoo.org Reply-to: gentoo-dev@lists.gentoo.org MIME-Version: 1.0 Received: by 10.52.188.136 with HTTP; Sat, 8 Oct 2011 17:19:45 -0700 (PDT) In-Reply-To: References: <20111008113307.GA13693@gentoo.org> From: Matt Turner Date: Sat, 8 Oct 2011 20:19:45 -0400 Message-ID: Subject: Re: [gentoo-dev] GCC upgrades, FUD and gentoo documentation To: gentoo-dev@lists.gentoo.org Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable X-Archives-Salt: X-Archives-Hash: 26730f5f1f12b7feca1b671f3deb7559 On Sat, Oct 8, 2011 at 6:57 PM, James Cloos wrote: >>>>>> "SV" =3D=3D Sven Vermeulen writes: > > SV> - Since 3.4.0/4.1.0, the C++ ABI is forward-compatible, so rebuilds > SV> =A0 from that version onwards should not be needed > > That is not generally true. > > I use gcc-4.5 as my system gcc, but mostly use 4.6 when building things > outside of portage. =A0I still run into compilation errors with C++ which > go away if I compile said code with 4.5. > > GCC=92s C++ abi is only *mostly* forwards compatible, not *entirely*. Is that a problem with the ABI, or just that gcc-4.6 is more strict? I think it's the latter. Matt