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,URIBL_BLOCKED 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 2A779C433F5 for ; Wed, 5 Sep 2018 17:50:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CA17220857 for ; Wed, 5 Sep 2018 17:50:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CA17220857 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 S1727665AbeIEWV7 convert rfc822-to-8bit (ORCPT ); Wed, 5 Sep 2018 18:21:59 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:40546 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727201AbeIEWV6 (ORCPT ); Wed, 5 Sep 2018 18:21:58 -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 0ED7640241CA; Wed, 5 Sep 2018 17:50:44 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-123-84.rdu2.redhat.com [10.10.123.84]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9847463A8A; Wed, 5 Sep 2018 17:50:42 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <20180905165552.GB25206@kroah.com> References: <20180905165552.GB25206@kroah.com> <153616286704.23468.584491117180383924.stgit@warthog.procyon.org.uk> To: Greg KH Cc: dhowells@redhat.com, linux-api@vger.kernel.org, linux-kbuild@vger.kernel.org, dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org, keyrings@vger.kernel.org, netfilter-devel@vger.kernel.org, linux-fsdevel@vger.kernel.org, alsa-devel@alsa-project.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: Re: [RFC] UAPI: Check headers by compiling all together as C++ MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <22224.1536169842.1@warthog.procyon.org.uk> Content-Transfer-Encoding: 8BIT Date: Wed, 05 Sep 2018 18:50:42 +0100 Message-ID: <22225.1536169842@warthog.procyon.org.uk> 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 [10.11.55.7]); Wed, 05 Sep 2018 17:50:44 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.7]); Wed, 05 Sep 2018 17:50:44 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'dhowells@redhat.com' RCPT:'' Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Greg KH 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? There's at least one outstanding bug due to a C++ identifier in the kernel UAPI headers. Are you saying you explicitly don't want people to be able to use the kernel UAPI headers in C++? > 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? No, because there's no such trick (except with the preprocessor). David