[alsa-devel] ABI breakage in alsa-lib 1.2

[alsa-devel] ABI breakage in alsa-lib 1.2

[Jordi Mallach]

[Please Cc me on replies, I'm not currently subscribed to alsa-devel]

Hello,

I'm one of the ALSA Debian maintainers, and some weeks ago I looked
into updating our ALSA packages to 1.2.1.

I quickly noticed there's been some fundamental change to libasound2,
one that appears to break ABI and should have warranted an soname bump
at least.

With the split of the snd_tplg API to the new libatopology2, libasound2
has been left missing that part of the API that was part of the
asound.h header, etc. This could have been a somewhat lesser issue if
libasound2 linked to libatopology, but unfortunately this goes in the
other direction, so the ABI and API breakage is not avoided.

I cannot update alsa-lib in this state. I could hack around and patch
it to reinstate the missing api in libasound, but this sounds like pain
and suffering for everyone involved. How should we move forward with
this?

I am sorry I only come up with this 2 months after the release when I
had identified the problem many weeks ago, I've been extremely busy.

Thanks,
Jordi
-- 
Jordi Mallach <jordi@debian.org>
Debian Project

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Re: [alsa-devel] ABI breakage in alsa-lib 1.2

[Jaroslav Kysela]

Dne 10. 01. 20 v 23:58 Jordi Mallach napsal(a):
> [Please Cc me on replies, I'm not currently subscribed to alsa-devel]
> 
> Hello,
> 
> I'm one of the ALSA Debian maintainers, and some weeks ago I looked
> into updating our ALSA packages to 1.2.1.
> 
> I quickly noticed there's been some fundamental change to libasound2,
> one that appears to break ABI and should have warranted an soname bump
> at least.
> 
> With the split of the snd_tplg API to the new libatopology2, libasound2
> has been left missing that part of the API that was part of the
> asound.h header, etc. This could have been a somewhat lesser issue if
> libasound2 linked to libatopology, but unfortunately this goes in the
> other direction, so the ABI and API breakage is not avoided.
> 
> I cannot update alsa-lib in this state. I could hack around and patch
> it to reinstate the missing api in libasound, but this sounds like pain
> and suffering for everyone involved. How should we move forward with
> this?
> 
> I am sorry I only come up with this 2 months after the release when I
> had identified the problem many weeks ago, I've been extremely busy.

It's not a problem at all. Those API/ABI is used only in the alsatplg utility 
from the alsa-utils package which has the specific usage - compilation the 
topology files from the configuration file to the binary form for the driver. 
This tool is used only by the developers. I believe that you have zero users 
for this. No other applications are expected to be touched. I would not do 
this split, if it affects something serious.

					Jaroslav

> 
> Thanks,
> Jordi
> 


-- 
Jaroslav Kysela <perex@perex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.
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