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Re: Versioned Symbols



* Junichi Uekawa (dancer@netfort.gr.jp) wrote:
> > What about it would avoid libssl0.9.6 problems?  Nothing I saw would
> > solve the problems of multiple versions of a library ending up linked
> > into the same process except the symbol versioning portion, which is
> > what I'm advocating here but you seem to be against while offering
> > 'solutions' that either don't deal with the problem at all or only solve
> > a portion of it.
> 
> Following libpkg-guide will avoid future similar problems.

Wrong, wrong, wrong.  Quit spreading misinformation.

> To work around libssl problem, you can certainly use 
> symbol versioning.

That's a solution and what I'm trying to push for.

> You could also take an approach of pulling out libssl-dev,
> and making packages to Build-Depend on libssl0.9.7-dev libssl0.9.6-dev
> explicitly, and starting to rebuild packages against them.
> 
> That way, within Debian, it is not possible to build a package
> that is simultaneously linked against libssl0.9.6 and libssl0.9.7.
> 
> That is what libpkg-guide documents.

Will you please just quit with the foolish claims?  Even if packages
build-depend on a specific library version a running process can end up
being linked against two versions of a library.  Here we go, again:

At time X libssl0.9.6-dev is in Debian.
At time X ssh is built against libssl0.9.6-dev.
At time Y libssl0.9.7-dev is uploaded to Debian.
At time Y libldap2 is built against libssl0.9.7-dev.
At time Z a user installs libssl0.9.6, libssl0.9.7, ssh, libldap2
and libpam-ldap, all of which are in Debian and all of which can be
installed without any problems with dependencies.
At time Z the ssh process will end up linked (AT RUNTIME) to both
libssl0.9.6 *AND* libssl0.9.7.  ssh will end up segfaulting because of
this.

*Please* tell me you see and understand the problem.  I'm really getting
tired of having to explain it to you over and over again.

	Stephen

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