Re: [Qemu-devel] CMSG_SPACE() causing compile time error on Mac OS X

[Programmingkid]

On Jan 18, 2016, at 4:58 AM, Daniel P. Berrange wrote:

> On Sun, Jan 17, 2016 at 05:23:44PM -0500, Programmingkid wrote:
>> I was wondering if you had problems compiling QEMU on Mac OS X recently. On 
>> my system, the channel-socket.c file causes this error:
>> 
>> io/channel-socket.c: In function 'qio_channel_socket_writev':
>> io/channel-socket.c:497:18: error: variable-sized object may not be 
>> initialized
>>     char control[CMSG_SPACE(sizeof(int) * SOCKET_MAX_FDS)] = { 0 };
> 
> Can you try applying this patch:
> 
> diff --git a/io/channel-socket.c b/io/channel-socket.c
> index eaa411f..bc117b1 100644
> --- a/io/channel-socket.c
> +++ b/io/channel-socket.c
> @@ -493,10 +495,12 @@ static ssize_t qio_channel_socket_writev(QIOChannel 
> *ioc,
>     QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
>     ssize_t ret;
>     struct msghdr msg = { NULL, };
> -    char control[CMSG_SPACE(sizeof(int) * SOCKET_MAX_FDS)] = { 0 };
> +    char control[CMSG_SPACE(sizeof(int) * SOCKET_MAX_FDS)];
>     size_t fdsize = sizeof(int) * nfds;
>     struct cmsghdr *cmsg;
> 
> +    memset(control, 0, CMSG_SPACE(sizeof(int) * SOCKET_MAX_FDS));
> +
>     msg.msg_iov = (struct iovec *)iov;
>     msg.msg_iovlen = niov;
> 
> 
> 
> Regards,
> Daniel
> -- 
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Your patch solves the problem. Good job!

Reviewed-By: John Arbuckle <address@hidden>