Re: [Xen-devel] [libvirt] [PATCH 1/2] virdbus: don't force users to pass int for bool values

[Eric Blake <eblake@xxxxxxxxxx>]

On 11/24/2014 02:43 AM, Ian Campbell wrote:

>>>>
>>>> I think this change breaks build on FreeBSD:
>>>>
>>>>   CC       util/libvirt_util_la-virdbus.lo
>>>> util/virdbus.c:956:13: error: cast from 'bool *' to 'dbus_bool_t *' (aka 
>>>> 'unsigned int *') increases required alignment from 1 to 4 
>>>> [-Werror,-Wcast-align]
>>>>             GET_NEXT_VAL(dbus_bool_t, bool_val, bool, "%d");
>>>>             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>> util/virdbus.c:858:17: note: expanded from macro 'GET_NEXT_VAL'
>>>>             x = (dbustype *)(*xptrptr + (*narrayptr - 1));              \
>>>>                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1 error 
>>>> generated.
>>>
>>> Valid complaint, so I'll have to figure something out to avoid it.  :(

> I'm, guessing that this is the same underlying issue as:
>         util/virdbus.c: In function 'virDBusMessageIterDecode':
>         util/virdbus.c:956:346: error: cast increases required alignment of 
> target type [-Werror=cast-align]

Yes.

>         
> which we are seeing in the Xen automated tests [0, 1] (on armhf only,
> probably compiler dependent?).

So, do I have an ACK on my proposed fix yet? :)
https://www.redhat.com/archives/libvir-list/2014-November/msg00838.html

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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