From owner-sc22wg5+sc22wg5-dom8=www.open-std.org@open-std.org Sun Sep 16 00:25:29 2012 Return-Path: X-Original-To: sc22wg5-dom8 Delivered-To: sc22wg5-dom8@www.open-std.org Received: by www.open-std.org (Postfix, from userid 521) id DEDF3356925; Sun, 16 Sep 2012 00:25:29 +0200 (CEST) Delivered-To: sc22wg5@open-std.org Received: from nm19.access.bullet.mail.sp2.yahoo.com (nm19.access.bullet.mail.sp2.yahoo.com [98.139.44.146]) by www.open-std.org (Postfix) with SMTP id 11C70356925 for ; Sun, 16 Sep 2012 00:25:26 +0200 (CEST) Received: from [98.139.44.107] by nm19.access.bullet.mail.sp2.yahoo.com with NNFMP; 15 Sep 2012 22:25:25 -0000 Received: from [98.139.44.65] by tm12.access.bullet.mail.sp2.yahoo.com with NNFMP; 15 Sep 2012 22:25:25 -0000 Received: from [127.0.0.1] by omp1002.access.mail.sp2.yahoo.com with NNFMP; 15 Sep 2012 22:25:25 -0000 X-Yahoo-Newman-Id: 736871.9432.bm@omp1002.access.mail.sp2.yahoo.com Received: (qmail 78382 invoked from network); 15 Sep 2012 22:25:25 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1347747925; bh=AO716lEtEvIlzrWGXDj5lLsz0HaTp9SiH4vBOLkc/0o=; h=X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Message-ID:Date:From:User-Agent:MIME-Version:To:CC:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=0ewQiTAf/BZLrGuLINvwblLipZpIwM22Zcb3YBJvGX4LoJscOi4+Eq4tdShxTqUbknYfmj2LsQSr0haoyx2hWedXJA3amdyXujUlFIaOrHAGaBesFvQEfZcgRVQ8JT9k3LFxC4WkvD4z810k8e3p2B3mnfwwGtZ2ShhcQc5zWzo= X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: Y2jKJcgVM1nHCYH9SfQi1AJJnmUlAmN6dgIbza1V2G5M5l_ R.aamsClSKJx2_o2vm_6LGGr67S5oUOeHwju4qhL97.IxzlfEq9L3fwV1w0p nRd6A9Vc9dXX4XuCXB3P3PCdItkV.HGu7alFVUIsuikfT.KBG8ITskvIi2gw ymssIMWQGRnU6wZuNoPkeOQ_ymCO48VkHrhXrOqH3La9prDmb4QH3UizRsk8 16KxJY5NQwfwtO1l.sXihndaVsYB4vsmnqxLmV6f9L0izNls57vic5LMEED8 cB2QiHpgyFy7UwGmp7u06qPmvHy93wB91uux.MrYw6edWt63EZJz5cijVl_o tcWeybjlQ5q7PakTFSw_dcCpo6PjjRf79HG_hhPlTUI8q9wfch0gbhhozGg8 wi4SR6oRBaNMsfiCb6XleFeHJZqP4Goc9biJWdVy.DAEuhtvo3_tUFxl1mRy 40QYf X-Yahoo-SMTP: EsWMRgGswBCJ115Lh3i7tuoFc7oZg_W1NL_P8LouqQe9CakaKQ-- Received: from [192.168.1.11] (van.snyder@76.208.161.211 with plain) by smtp107.sbc.mail.ne1.yahoo.com with SMTP; 15 Sep 2012 15:25:24 -0700 PDT Message-ID: <50550053.70105@jpl.nasa.gov> Date: Sat, 15 Sep 2012 15:25:23 -0700 From: Van Snyder User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.6) Gecko/20070802 SeaMonkey/1.1.4 MIME-Version: 1.0 To: "N.M. Maclaren" CC: sc22wg5 Subject: Re: [ukfortran] (SC22WG5.4776) [WG5 letter ballot 4 on Fortran 2008 interpretations] References: <20120914232724.BB7E5356938@www.open-std.org> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-sc22wg5@open-std.org Precedence: bulk N.M. Maclaren wrote: > This is merely a remark on a response, not a response. > > On Sep 15 2012, Van Snyder wrote: >> >> -C- --- F08/0057 Interoperability with empty types >> >> Does this need a compatibility caveat in 1.6? > > I doubt it. While empty structures are allowed in C++, including in its > C mode, and they are allowed as an extension in gcc and Intel C, it IS > explicitly and clearly illegal in C and has not been added even to C11. > Despite the statement in the question, it is neither a syntax error nor > a constraint in C - it is merely forbidden, and so can be extended > without needing a warning - but compatibility caveats for > interoperability > with extended C languages does seem to be going a bit far. Just because one declares a type with the BIND(C) attribute, and creates objects of that type, doesn't mean they are actually ever used for interoperation. Bizarre, yes, but permitted by the standard -- until this interp. Compatibility caveats in 1.6 are for compatibility with earlier Fortran standards, not for interoperability. "We allowed this in Fortran 2003, but not any more."