>>> On 4/9/2013 at 09:24 PM, "Zhanghaoyu (A)" <haoyu.zh...@huawei.com> wrote: >> > I compile the QEMU source download from qemu.git >> > (http://git.qemu.org/git/qemu.git) on 4-9-2013, errors reported as >> > below, >> > >> > >> > >> > hw/virtio/dataplane/vring.c: In function 'vring_enable_notification': >> > >> > hw/virtio/dataplane/vring.c:72: warning: implicit declaration of >> > function 'vring_avail_event' >> > >> > hw/virtio/dataplane/vring.c:72: warning: nested extern declaration of >> > 'vring_avail_event' >> > >> > hw/virtio/dataplane/vring.c:72: error: lvalue required as left operand >> > of assignment >> > >> > hw/virtio/dataplane/vring.c: In function 'vring_should_notify': >> > >> > hw/virtio/dataplane/vring.c:107: warning: implicit declaration of >> > function 'vring_need_event' >> > >> > hw/virtio/dataplane/vring.c:107: warning: nested extern declaration of >> > 'vring_need_event' >> > >> > hw/virtio/dataplane/vring.c:107: warning: implicit declaration of >> > function 'vring_used_event' >> > >> > hw/virtio/dataplane/vring.c:107: warning: nested extern declaration of >> > 'vring_used_event' >> > >> > hw/virtio/dataplane/vring.c: In function 'vring_pop': >> > >> > hw/virtio/dataplane/vring.c:262: error: lvalue required as left >> > operand of assignment >> > >> > make: *** [hw/virtio/dataplane/vring.o] Error 1 >> > >> > >> > >> > 'vring_avail_event' and 'vring_need_event' defined in >> > /linux-headers/linux/virtio_ring.h, are not available in vring.c ? >> >> Please send the log of "make V=1". >> >> Paolo > > The log of "make V=1" is identical with that of "make", shown as below, > > hw/virtio/dataplane/vring.c: In function 'vring_enable_notification': > hw/virtio/dataplane/vring.c:72: warning: implicit declaration of function > 'vring_avail_event' > hw/virtio/dataplane/vring.c:72: warning: nested extern declaration of > 'vring_avail_event' > hw/virtio/dataplane/vring.c:72: error: lvalue required as left operand of > assignment > hw/virtio/dataplane/vring.c: In function 'vring_should_notify': > hw/virtio/dataplane/vring.c:107: warning: implicit declaration of function > 'vring_need_event' > hw/virtio/dataplane/vring.c:107: warning: nested extern declaration of > 'vring_need_event' > hw/virtio/dataplane/vring.c:107: warning: implicit declaration of function > 'vring_used_event' > hw/virtio/dataplane/vring.c:107: warning: nested extern declaration of > 'vring_used_event' > hw/virtio/dataplane/vring.c: In function 'vring_pop': > hw/virtio/dataplane/vring.c:262: error: lvalue required as left operand of > assignment > make: *** [hw/virtio/dataplane/vring.o] Error 1 > > Thanks, > Zhang Haoyu
I'm seeing the same failure. It turns out that linux-headers/linux/virtio_ring.h is not being referenced, but rather /usr/include/linux/virtio_ring.h, which in my case (and presumably yours as well) is not as recent and doesn't have vring_avail_event() and vring_used_event(). Bruce
