Re: [Xen-devel] [PATCH 1/2] build/clang: remove the address-of-packed-member warning

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On 06/03/17 13:58, Jan Beulich wrote:
>>>> On 06.03.17 at 13:31, <roger.pau@xxxxxxxxxx> wrote:
>> --- a/Config.mk
>> +++ b/Config.mk
>> @@ -216,6 +216,7 @@ $(call 
>> cc-option-add,HOSTCFLAGS,HOSTCC,-Wdeclaration-after-statement)
>>  $(call cc-option-add,CFLAGS,CC,-Wdeclaration-after-statement)
>>  $(call cc-option-add,CFLAGS,CC,-Wno-unused-but-set-variable)
>>  $(call cc-option-add,CFLAGS,CC,-Wno-unused-local-typedefs)
>> +$(call cc-option-add,CFLAGS,CC,-Wno-address-of-packed-member)
> 
> Actually, having thought some more about this, the warning
> should be suppressed only for x86 imo. ARM wants aligned
> accesses after all.

Looking at Roger's complaint, it appears that the warning is issued even
if the member actually is aligned, if *on some unknown system*, it might
someday be un-aligned.

 -George

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