Re: [FFmpeg-devel] Patchwork FATE Errors

[Andreas Rheinhardt <andreas.rheinhardt@outlook.com>]

Soft Works:
> 
> 
>> -----Original Message-----
>> From: ffmpeg-devel <ffmpeg-devel-bounces@ffmpeg.org> On Behalf Of Andreas
>> Rheinhardt
>> Sent: Thursday, January 20, 2022 10:22 PM
>> To: ffmpeg-devel@ffmpeg.org
>> Subject: Re: [FFmpeg-devel] Patchwork FATE Errors
>>
>> Soft Works:
>>>
>>> andriy/make_fate_ppc
>>>
>>> => Does it possibly need 'make fate-rsync'?
>>>
>>
>> No. The test does not rely on need samples; 
> 
> It was just a very quick guess, because yesterday I rebased and
> saw the test matroska-dovi-write-config7 failing which was fixed
> after fate-rsync - that's why I though it might be the same reason
> (with make -jX, it's probably not deterministic, which test will
> fail first).
> 
> 
>> and the other test that uses
>> this sample works fine. Some time ago, someone else wrote FATE tests for
>> AVDOVIDecoderConfigurationRecord in Matroska
>> (https://patchwork.ffmpeg.org/project/ffmpeg/patch/20220101165153.440729-6-
>> tcChlisop0@gmail.com/).
>> These were faulty and one of them relied on a sample that has apparently
>> never been uploaded (but this test is actually redundant with the other
>> test), so I investigated and saw that the test (presumably
>> unintentially) reencoded audio, so I switched it to a pure copy test and
>> applied it, believing that codec-copy tests could not possibly for some
>> arches. That was a mistake and I am deeply sorry for this mess.
> 
> Nevermind - things happen..
> 
> 
> BTW, I was thinking about submitting a patch for libavutil/tests/md5.c
> 
> something like:
> 
> #ifdef __GNUC__
> #pragma GCC diagnostic ignored "-Wdiscarded-qualifiers"
> #endif
> 
> #ifdef __clang__
> #pragma clang diagnostic ignored "-Wdiscarded-qualifiers"
> #endif
> 
> Would that make sense?
> Those warnings are appearing in every single fate error output on patchwork,
> possibly covering up more relevant things.
> 

Instead of pragmas one should limit the volatile to those compilers
which miscompile the code without them.
(IMO one does not need to find the exact set of compilers that
miscompile this; all that matters is that recent versions don't give
warnings and old versions don't miscompile. If some compilers of medium
age still show this warning afterwards without needing the volatile, so
be it.)

- Andreas
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