From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A95F8C43334 for ; Wed, 5 Sep 2018 17:43:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6253B205F4 for ; Wed, 5 Sep 2018 17:43:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6253B205F4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727695AbeIEWOU (ORCPT ); Wed, 5 Sep 2018 18:14:20 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:53584 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726497AbeIEWOT (ORCPT ); Wed, 5 Sep 2018 18:14:19 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5A33F4023351; Wed, 5 Sep 2018 17:43:05 +0000 (UTC) Received: from redhat.com (ovpn-124-138.rdu2.redhat.com [10.10.124.138]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5861AFA96C; Wed, 5 Sep 2018 17:42:59 +0000 (UTC) Date: Wed, 5 Sep 2018 13:42:58 -0400 From: "Michael S. Tsirkin" To: Yann Droneaud Cc: Greg KH , David Howells , linux-api@vger.kernel.org, linux-kbuild@vger.kernel.org, Michal Marek , dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org, keyrings@vger.kernel.org, David Airlie , linux-nilfs@vger.kernel.org, linux-nvdimm@lists.01.org, codalist@coda.cs.cmu.edu, coda@cs.cmu.edu, coreteam@netfilter.org, Rob Clark , linux-arm-msm@vger.kernel.org, Kent Overstreet , Dan Williams , Takashi Iwai , linux-bcache@vger.kernel.org, Coly Li , Jaroslav Kysela , Jan Harkes , Masahiro Yamada , Ryusuke Konishi , Jason Wang , Mat Martineau , netfilter-devel@vger.kernel.org, linux-fsdevel@vger.kernel.org, moderated for non-subscribers , freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: Re: [RFC] UAPI: Check headers by compiling all together as C++ Message-ID: <20180905133711-mutt-send-email-mst@kernel.org> References: <153616286704.23468.584491117180383924.stgit@warthog.procyon.org.uk> <20180905165552.GB25206@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Wed, 05 Sep 2018 17:43:05 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Wed, 05 Sep 2018 17:43:05 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'mst@redhat.com' RCPT:'' Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Sep 05, 2018 at 07:33:38PM +0200, Yann Droneaud wrote: > Hi, > > Le mercredi 05 septembre 2018 à 18:55 +0200, Greg KH a écrit : > > On Wed, Sep 05, 2018 at 04:54:27PM +0100, David Howells wrote: > > > > > > Here's a set of patches that inserts a step into the build process to make > > > sure that the UAPI headers can all be built together with C++ (if the > > > compiler being used supports C++). All but the final patch perform fixups, > > > including: > > > > Wait, why do we care? What has recently changed to start to directly > > import kernel uapi files into C++ code? > > > > And if userspace wants to do this, can't they do the C namespace trick > > themselves when they do the import? That must be how they are doing it > > today, right? > > > > They can't. > > > Adding extern "C" { } doesn't magically make "class" a non keyword. > Even if it was the case, writing C++ code using whatever->class would > probably broke because class is a keyword in C++. I think it's a bug in the language TBH. > -- > Yann Droneaud > OPTEYA >