net/virtio: fix build

Add extern to variable declaration to avoid some compiler treating it
as variable definition.

build error log:

lib/librte_pmd_virtio.a(vhost_kernel.o):(.rodata+0x110):
multiple definition of `vhost_msg_strings'
lib/librte_pmd_virtio.a(vhost_user.o):(.data.rel.ro.local+0x0):
first defined here
lib/librte_pmd_virtio.a(virtio_user_dev.o):(.rodata+0xe8):
multiple definition of `vhost_msg_strings'
lib/librte_pmd_virtio.a(vhost_user.o):(.data.rel.ro.local+0x0):
first defined here

Fixes: 33d24d65fe2b ("net/virtio-user: abstract backend operations")
Cc: stable@dpdk.org
Signed-off-by: Jerin Jacob <jerinj@marvell.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

diff --git a/drivers/net/virtio/virtio_user/vhost.h b/drivers/net/virtio/virtio_user/vhost.h
index 55f4703..1e784e5 100644 (file)
--- a/drivers/net/virtio/virtio_user/vhost.h
+++ b/drivers/net/virtio/virtio_user/vhost.h
@@ -67,7 +67,7 @@ enum vhost_user_request {
        VHOST_USER_MAX
 };
 
-const char * const vhost_msg_strings[VHOST_USER_MAX];
+extern const char * const vhost_msg_strings[VHOST_USER_MAX];
 
 struct vhost_memory_region {
        uint64_t guest_phys_addr;