From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 39629 invoked by alias); 21 Sep 2017 13:34:24 -0000 Mailing-List: contact gdb-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sourceware.org Received: (qmail 39611 invoked by uid 89); 21 Sep 2017 13:34:23 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.4 required=5.0 tests=AWL,BAYES_00,RP_MATCHES_RCVD,SPF_HELO_PASS,SPF_PASS autolearn=ham version=3.3.2 spammy= X-Spam-User: qpsmtpd, 2 recipients X-HELO: smtp.polymtl.ca Received: from smtp.polymtl.ca (HELO smtp.polymtl.ca) (132.207.4.11) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Thu, 21 Sep 2017 13:34:17 +0000 Received: from simark.ca (simark.ca [158.69.221.121]) (authenticated bits=0) by smtp.polymtl.ca (8.14.7/8.14.7) with ESMTP id v8LDYA0V014572 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 21 Sep 2017 09:34:15 -0400 Received: by simark.ca (Postfix, from userid 112) id 1BB4D1E519; Thu, 21 Sep 2017 09:26:15 -0400 (EDT) Received: from simark.ca (localhost [127.0.0.1]) by simark.ca (Postfix) with ESMTP id 8AF341E512; Thu, 21 Sep 2017 09:25:53 -0400 (EDT) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Thu, 21 Sep 2017 13:34:00 -0000 From: Simon Marchi To: Petr Ovtchenkov Cc: Pedro Alves , Matt Rice , Fiodar Stryzhniou , Andreas Schwab , Binutils , Joel Brobecker , Matthias Klose , GDB Subject: Re: meaning of "Automatic date update in version.in" commits In-Reply-To: <20170921161743.3ddc6bb9@void-ptr.info> References: <20170921135845.479dfc76@void-ptr.info> <024439c7-2083-d368-0138-2160e4494b81@redhat.com> <20170921152240.16bb4cc0@void-ptr.info> <8740f2a7-1300-3116-f34b-5487a8cd8b2b@redhat.com> <20170921161743.3ddc6bb9@void-ptr.info> Message-ID: X-Sender: simon.marchi@polymtl.ca User-Agent: Roundcube Webmail/1.3.0 X-Poly-FromMTA: (simark.ca [158.69.221.121]) at Thu, 21 Sep 2017 13:34:10 +0000 X-IsSubscribed: yes X-SW-Source: 2017-09/txt/msg00079.txt.bz2 On 2017-09-21 15:17, Petr Ovtchenkov wrote: > And date stamp in version.in not play here at all. But, > > - if you insert date stamp into sources, you > i) keep "litter" problem > ii) make misorientation (what this date mean? commit date? - it > already > present in commit; and what commit date?) > - if you don't insert date stamp into sources, but add to SONAME > during build process, > it still not reflect ABI compatibilities, but may prevent "binary > reproducible builds" > (depends upon what date you use). I'm underline, that such addition > has no relation to ABI compatibilities, so such SONAME modification > lose sense. Binary reproducible builds mean that if you and I start with the same source code and same build tools, we will get exactly the same build artifacts. Here the build can't "depend on what date you use": you can't choose a date or another, the date is part of the code you are trying to build. So if you and I build from the same commit, we'll build using the same date, whatever date is in the version.h file.