Re: [Qemu-devel] [PATCH] pixman: remove -Wredundand-decls

[Alexey Kardashevskiy <aik@ozlabs.ru>]

On 04/16/2013 01:55 AM, Markus Armbruster wrote:
> Alexey Kardashevskiy <aik@ozlabs.ru> writes:
>
>> On 04/15/2013 10:57 PM, Markus Armbruster wrote:
>>> Alexey Kardashevskiy <aik@ozlabs.ru> writes:
>>>
>>>> On 04/15/2013 08:01 PM, Peter Maydell wrote:
>>>>> On 15 April 2013 10:50, Alexey Kardashevskiy <aik@ozlabs.ru> wrote:
>>>>>> /home/alexey/pcipassthru/qemu-impreza/../lib4qemu/usr/include/assert.h:67:13:
>>>>>> error: redundant redeclaration of '__assert_fail' [-Werror=redundant-decls]
>>>>>> /home/alexey/pcipassthru/qemu-impreza/../lib4qemu/usr/include/assert.h:67:13:
>>>>>> note: previous declaration of '__assert_fail' was here
>>>>>> /home/alexey/pcipassthru/qemu-impreza/../lib4qemu/usr/include/assert.h:72:13:
>>>>>> error: redundant redeclaration of '__assert_perror_fail'
>>>>>> [-Werror=redundant-decls]
>>>>>
>>>>> This copy of assert.h seems to be broken. The declarations
>>>>> should be guarded (by _ASSERT_H_DECLS in my system's copy).
>>>>
>>>> Debian? It uses eglibc which is fork (or clone?) of glibc.
>>>>
>>>>> If it's widespread we might have to work around this.
>>>>
>>>> It is in fedora 18 and glibc's git master branch. Why "if"?
>>>
>>> It's in Fedora 17, too, but I *don't* get a warning.  Suspecting your
>>> compiler.  --version?
>>
>>
>> powerpc64-linux-gcc 4.6.3, 4.7.2, 4.8.0, all the same. I'll try to
>> track it down tomorrow why it all works when host and target are the
>> same (pretty sure this is the cse) but I just do not get it... It is
>> just me who sees obvious error in assert.h which is caused by
>> -Wno-redundant-decls? Even if you do not hit this now, you will get
>> there eventually.
>
> I don't doubt your gcc+libc is in error.  I just don't want to lose a
> useful warning because of that.
 >
> Workaround: configure --disable-werror

This workaround does NOT work if pragmas used. "#pragma GCC diagnostic 
error "-Wredundant-decls"" re-enables warnings as errors.



-- 
Alexey