Re: [Xen-devel] [PATCH 31/34] tools: Disable ignored-attributes warning when compiling with clang

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 03/27/2014 05:14 PM, Ian Campbell wrote:
> On Tue, 2014-03-25 at 16:55 +0000, Julien Grall wrote:
>> Clang 3.5 will fail to build most of the tools because aligned attribute
>> is not used sometimes:
>>
>> In file included from xc_core.c:64:
>> In file included from ./xg_private.h:30:
>> In file included from ./xenctrl.h:55:
>> ../../tools/include/xen/foreign/x86_64.h:198:47: error: 'aligned' attribute 
>> ignored when parsing type [-Werror,-Wignored-attributes]
>>     __align8__ uint64_t evtchn_pending[sizeof(__align8__ uint64_t) * 8];
>>                                               ^~~~~~~~~~
>> ../../tools/include/xen/foreign/x86_64.h:13:36: note: expanded from macro 
>> '__align8__'
>>  # define __align8__ __attribute__((aligned (8)))
>>                                    ^~~~~~~~~~~
>> ../../tools/include/xen/foreign/x86_64.h:199:44: error: 'aligned' attribute 
>> ignored when parsing type [-Werror,-Wignored-attributes]
>>     __align8__ uint64_t evtchn_mask[sizeof(__align8__ uint64_t) * 8];
> 
> Is sizeof(__align8__ uint64_t) != sizeof(uint64_t) under any
> circumstances? IOW can't we just drop the __align8__ here?

I don't think. This code is generated by mkheader.py. I will look at it
and see if I can modify it.

Regards,

-- 
Julien Grall

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