[FFmpeg-devel] [PATCH 1/4] swr: convert resample_common/linear_int16_mmx2/sse2 to yasm.

[Andreas Cadhalpun]

On 12.07.2014 21:40, Hendrik Leppkes wrote:
> On Sat, Jul 12, 2014 at 9:26 PM, Andreas Cadhalpun
> <andreas.cadhalpun at googlemail.com> wrote:
>
>>
>> I'm not sure what you mean with 'officially' here. Every symbol exported by
>> a shared library can be used by another program.
>> Even if only other av* libraries use the avpriv_* symbols they can't just be
>> removed, because that would break ABI compatibility between the old version
>> of the library using such a symbol with the new version of the other library
>> not exporting this symbol anymore.
>>
>
> Unrelated to any ABI or API problems, a use-case of mixing different
> versions  of the libraries strongly advised against ever using or a
> distribution enabling such use, because its hardly ever tested, and
> results may be rather unpredictable, especially with a lot of
> applications sadly still using some of the API "incorrectly".

There shouldn't be any problem, as long as libraries with the same major 
SOVERSION are ABI backward-compatible.
If there would be a problem, I would call it a (very strange) bug.
Have you ever heard of such a problem?

If you don't want different versions of the libraries used together, you 
should either bundle all these libraries into a big one or bump all 
major SOVERSIONs in every release. Neither of those make much sense, I 
think.

Best regards,
Andreas