[dpdk-dev] clang compilation errors with clang 4.0
Yuanhan Liu
yuanhan.liu at linux.intel.com
Mon Apr 17 09:52:42 CEST 2017
On Fri, Apr 14, 2017 at 04:55:53PM +0100, Bruce Richardson wrote:
> Hi all,
>
> just a heads-up that there are compilation errors showing up with
> compiling DPDK with clang 4.0 release. Here are some of the errors I am
> seeing. Volunteers to do patches for some of them welcome.
>
> Regards,
> /Bruce
>
> /home/bruce/dpdk.org/lib/librte_eal/common/eal_common_tailqs.c:92:24: warning: taking address of packed member 'qlock' of class or structure 'rte_mem_config' may result in an unaligned pointer value [-Waddress-of-packed-member]
> rte_rwlock_read_lock(&mcfg->qlock);
> ^~~~~~~~~~~
>
>
> /home/bruce/dpdk.org/lib/librte_eventdev/rte_eventdev.c:371:6: warning: logical not is only applied to the left hand side of this bitwise operator [-Wlogical-not-parentheses]
> if (!dev_conf->event_dev_cfg & RTE_EVENT_DEV_CFG_PER_DEQUEUE_TIMEOUT) {
> ^ ~
>
> /home/bruce/dpdk.org/lib/librte_ip_frag/rte_ipv4_reassembly.c:139:31: warning: taking address of packed member 'src_addr' of class or structure 'ipv4_hdr' may result in an unaligned pointer value [-Waddress-of-packed-member]
> psd = (unaligned_uint64_t *)&ip_hdr->src_addr;
> ^~~~~~~~~~~~~~~~
>
> /home/bruce/dpdk.org/lib/librte_vhost/vhost_user.c:1037:34: warning: taking address of packed member 'payload' of class or structure 'VhostUserMsg' may result in an unaligned pointer value [-Waddress-of-packed-member]
> vhost_user_set_vring_num(dev, &msg.payload.state);
> ^~~~~~~~~~~~~~~~~
Besides the 2nd warnign, all others are the same. Though I'm not quite
sure others, for this vhost-user one, I think it's a false-positive
warning.
--yliu
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