linux-kernel - Re: [RFC] UAPI: Check headers by compiling all together as C++

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Message-ID: <nycvar.YFH.7.76.1809052120510.24932@n3.vanv.qr>
Date:   Wed, 5 Sep 2018 21:22:11 +0200 (CEST)
From:   Jan Engelhardt <jengelh@...i.de>
To:     Greg KH <greg@...ah.com>
cc:     David Howells <dhowells@...hat.com>, linux-api@...r.kernel.org,
        linux-kbuild@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org,
        keyrings@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        linux-nilfs@...r.kernel.org, linux-nvdimm@...ts.01.org,
        "Michael S. Tsirkin" <mst@...hat.com>, codalist@...a.cs.cmu.edu,
        coda@...cmu.edu, coreteam@...filter.org,
        Rob Clark <robdclark@...il.com>, linux-arm-msm@...r.kernel.org,
        Kent Overstreet <kent.overstreet@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Takashi Iwai <tiwai@...e.com>, linux-bcache@...r.kernel.org,
        Coly Li <colyli@...e.de>, Jaroslav Kysela <perex@...ex.cz>,
        Jan Harkes <jaharkes@...cmu.edu>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>,
        Jason Wang <jasowang@...hat.com>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        netfilter-devel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        moderated for non-subscribers <alsa-devel@...a-project.org>,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] UAPI: Check headers by compiling all together as C++

On Wednesday 2018-09-05 18:55, Greg KH wrote:

>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?

With C++11, C++ has become a much nicer language to use (for userspace, anyway).

>And if userspace wants to do this, can't they do the C namespace trick
>themselves when they do the import?

The only trick is to use an extra C source file and extensively wrap things.