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Date: Fri, 22 Oct 2010 22:49:10 +0200
From: Stefan Weil <weil@mail.berlios.de>
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Subject: Re: [Qemu-devel] [PATCH 2/4] Silence compiler warning in json test
	case
References: <1287756396-13100-1-git-send-email-lcapitulino@redhat.com>	<1287756396-13100-3-git-send-email-lcapitulino@redhat.com>	<m3aam6gndw.fsf@blackfin.pond.sub.org>
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To: Luiz Capitulino <lcapitulino@redhat.com>
Cc: Jan Kiszka <jan.kiszka@web.de>, Markus Armbruster <armbru@redhat.com>, qemu-devel@nongnu.org

Am 22.10.2010 19:33, schrieb Luiz Capitulino:
> On Fri, 22 Oct 2010 19:15:07 +0200
> Markus Armbruster<armbru@redhat.com>  wrote:
>
>    
>> Luiz Capitulino<lcapitulino@redhat.com>  writes:
>>
>>      
>>> From: Jan Kiszka<jan.kiszka@web.de>
>>>
>>> This avoids
>>>
>>>      error: zero-length gnu_printf format string
>>>
>>> Signed-off-by: Jan Kiszka<jan.kiszka@siemens.com>
>>> Signed-off-by: Luiz Capitulino<lcapitulino@redhat.com>
>>> ---
>>>   check-qjson.c |    4 +++-
>>>   1 files changed, 3 insertions(+), 1 deletions(-)
>>>
>>> diff --git a/check-qjson.c b/check-qjson.c
>>> index 0b60e45..64fcdcb 100644
>>> --- a/check-qjson.c
>>> +++ b/check-qjson.c
>>> @@ -639,7 +639,9 @@ END_TEST
>>>
>>>   START_TEST(empty_input)
>>>   {
>>> -    QObject *obj = qobject_from_json("");
>>> +    const char *empty = "";
>>> +
>>> +    QObject *obj = qobject_from_json(empty);
>>>       fail_unless(obj == NULL);
>>>   }
>>>   END_TEST
>>>        
>> The warning is silly.  Printing nothing is unlikely to happen
>> unintentionally, and is perfectly well-defined and portable.
>>
>> Why make the code ugly to avoid a useless warning, when we can disable
>> the warning?
>>      
> You mean, disable it only for this specific case or QEMU wide?
>
> If it's the former, please, submit a patch. Otherwise, this has been
> discussed already and the conclusion was that the warning is
> useful:
>
>   http://www.mail-archive.com/qemu-devel@nongnu.org/msg44072.html
>
> Honestly speaking, no matter what the conclusion is, what can not
> happen is having code that doesn't compile in the tree. Either: we apply
> this patch or revert the patch that broke the build.
>    


If needed, commit 8b7968f7c4ac8c07cad6a1a0891d38cf239a2839
can be reverted partially (only for qjson.h).

Tell me if you would prefer that solution, then I can send a patch.