linux-kernel - Re: [PATCH 03/11] UAPI: virtio_net: Fix use of C++ keywords as structural members

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Date:   Wed, 5 Sep 2018 13:35:29 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     David Howells <dhowells@...hat.com>
Cc:     linux-api@...r.kernel.org, linux-kbuild@...r.kernel.org,
        Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/11] UAPI: virtio_net: Fix use of C++ keywords as
 structural members

On Wed, Sep 05, 2018 at 04:54:55PM +0100, David Howells wrote:
> The virtio_net_ctrl_hdr struct uses a C++ keyword as structural members.  Fix
> this by inserting an anonymous union that provides an alternative name and
> then hide the reserved name in C++.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: "Michael S. Tsirkin" <mst@...hat.com>
> cc: Jason Wang <jasowang@...hat.com>
> cc: virtualization@...ts.linux-foundation.org
> ---
> 
>  include/uapi/linux/virtio_net.h |    7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/include/uapi/linux/virtio_net.h b/include/uapi/linux/virtio_net.h
> index a3715a3224c1..967142bc0e05 100644
> --- a/include/uapi/linux/virtio_net.h
> +++ b/include/uapi/linux/virtio_net.h
> @@ -150,7 +150,12 @@ struct virtio_net_hdr_mrg_rxbuf {
>   * command goes in between.
>   */
>  struct virtio_net_ctrl_hdr {
> -	__u8 class;
> +	union {
> +#ifndef __cplusplus
> +		__u8 class;
> +#endif
> +		__u8 _class;
> +	};
>  	__u8 cmd;
>  } __attribute__((packed));


As long as you do not intend to use any classes, how about
simply adding

-Dclass=_class

to your command line?

Seems to work fine with gcc 8.1.1 on Fedora.

-- 
MST