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

[Hendrik Leppkes]

On Sat, Jul 12, 2014 at 9:56 PM, Andreas Cadhalpun
<andreas.cadhalpun at googlemail.com> wrote:
> 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.
>
>

There have been a lot of those bugs, which get fixed when found, but
its something that easily breaks and is hard to find, so its just
something you should avoid instead of encourage.

- Hendrik