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

[Daniel P. Berrange]

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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