[Pkg-alsa-devel] Re: [Alsa-devel] 1.0.13rc3: relocation error: mocp: symbol snd_pcm_hw_params_get_channels_min ..

[Takashi Iwai]

At Tue, 26 Sep 2006 17:03:29 -0400,
Lee Revell wrote:
> 
> On Tue, 2006-09-26 at 22:40 +0200, Elimar Riesebieter wrote:
> > On Tue, 26 Sep 2006 the mental interface of
> > Lee Revell told:
> > 
> > > On Tue, 2006-09-26 at 22:13 +0200, Elimar Riesebieter wrote:
> > > > Hi all,
> > > > 
> > > > I am testing 1.0.13rc3 (lib/driver/utils) on PPC/2.6.18
> > > > 
> > > > Starting a soundapp like moc gives:
> > > > 
> > > > "relocation error: mocp: symbol snd_pcm_hw_params_get_channels_min,
> > > > version ALSA_0.9.0rc4 not defined in file libasound.so.2 with link
> > > > time reference"
> > > > 
> > > > Any hints?
> > > > 
> > > 
> > > Application was compiled against a different alsa-lib version than is
> > > present.
> > 
> > This was my idea as well, but apps compiled with versions << 1.0.12
> > are running with 1.0.13rc2?
> 
> It's not guaranteed that using a wrong library version won't work.

The backward compatibility is guaranteed.
That's the very reason that such a versioned symbol was introduced.
(And it was a big failure...)

Please don't mix up the things about config files and the library ABI
compatibility.  In a very rare case, the configuration file doesn't
match with the driver version.  This happend once on emu10k1 (and
people now think that it's a frequent case, unforunately, although
we've tried to keep the compatibility of config stuff since then).
But, the ABI is kept backward-compatible for many years. 

So, you don't have to use the same version of alsa-lib.  In general,
the newer version is always better.  The newer one includes more
bugfixes and new features.


BTW, the problem here looks like a build of alsa-lib with versioned
symbols.  Or, the app isn't linked to libasound at compile time, so it
couldn't resolve the versioned symbols properly.  It's a common
problem with versioned symbols.


Takashi