From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 48417 invoked by alias); 16 Mar 2018 13:48:37 -0000 Mailing-List: contact fortran-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: fortran-owner@gcc.gnu.org Received: (qmail 48287 invoked by uid 89); 16 Mar 2018 13:48:34 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.7 required=5.0 tests=AWL,BAYES_00,SPF_PASS autolearn=ham version=3.3.2 spammy=HTo:U*jvdelisle X-HELO: probity.mcc.ac.uk Received: from probity.mcc.ac.uk (HELO probity.mcc.ac.uk) (130.88.200.94) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Fri, 16 Mar 2018 13:48:32 +0000 Received: from asmtp2.its.manchester.ac.uk ([130.88.13.150]) by probity.mcc.ac.uk with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1 (FreeBSD)) (envelope-from ) id 1ewpif-000LcH-Aj; Fri, 16 Mar 2018 13:48:29 +0000 Received: from [10.247.128.21] (port=57050 helo=albion.it.manchester.ac.uk) by asmtp2.its.manchester.ac.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1ewpif-0008T9-8q; Fri, 16 Mar 2018 13:48:29 +0000 From: Dave Love To: Jerry DeLisle Cc: fortran@gcc.gnu.org Subject: Re: backwards incompatibility References: <871sgp8fpb.fsf@albion.it.manchester.ac.uk> <87zi3c57o8.fsf@albion.it.manchester.ac.uk> X-Draft-From: ("nntp+news.gmane.org:gmane.comp.gcc.fortran" 49849) Date: Fri, 16 Mar 2018 13:48:00 -0000 In-Reply-To: (Jerry DeLisle's message of "Tue, 13 Mar 2018 19:30:27 -0700") Message-ID: <87vadwyvv7.fsf@albion.it.manchester.ac.uk> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Authenticated-From: Dave.Love@manchester.ac.uk X-Spam-Score: -5.0(?) X-SW-Source: 2018-03/txt/msg00086.txt.bz2 Jerry DeLisle writes: > It would be an order of magnitude easier and take less time if you > just recompiled all of your sources. I hope you use make or cmake or > at least some build scripting and let it run overnight. Or, does it > take a week or two? > > Regards, > > Jerry [I saw this late on gmane as I'm not subscribed to the list.] This isn't necessarily about "my" sources (stuff on local systems). I go with the engineering trades-off in packaging and late binding (in this context) rather than combinatorial rebuild-the-world and distribute packaging. I'm specifically interested in RHEL (EPEL) packages, and concerned by the lack of information on ABI compatibility of, say, gfortran 4.8 (the system version) and gfortran 6 (the latest with the same libgfortan, distributed for RHEL-like systems and necessary for several things like proper MPI support and avx512). Can someone say if 6 is (in)compatible with 4.8 apart from the module format, assuming the same language features?