Bug#791286: smokegen: library transition may be needed when GCC 5 is the default

[Scott Kitterman <debian@kitterman.com>]

On Thursday, August 13, 2015 09:39:43 AM Stéphane Glondu wrote:
> Control: tags -1 + confirmed
> Control: severity -1 serious
> 
> On Fri, 03 Jul 2015 13:14:20 +0000 Matthias Klose <doko@debian.org> wrote:
> >  - Decide if the symbols matching __cxx11 or B5cxx11 are part of the
> >  
> >    library API, and are used by the reverse dependencies of the
> >    library.
> 
> There is at least one such symbol: _ZN5Smoke8classMapB5cxx11E
> 
> >  - If there are no reverse dependencies, it should be the package
> >  
> >    maintainers decision if a transition is needed.  However this might
> >    break software which is not in the Debian archive, and built
> >    against these packages.
> 
> There are many reverse dependencies.
> 
> >  - If a library transition is needed, please prepare for the change.
> >  
> >    Rename the library package, append "v5" to the name of the package
> >    (e.g. libfoo2 -> libfoo2v5). Such a change can be avoided, if you
> >    have a soversion bump and you upload this version instead of the
> >    renamed package.  Prepare a patch and attach it to this issue (mark
> >    this issue with patch), so that it is possible to NMU such a
> >    package. [...]
> 
> TODO

I looked and the non-optional symbol that goes missing is:

c++filt _ZN5Smoke8classMapE     
Smoke::classMap

This is only used in qt4-perl according to codesearch.d.n.  I've locally 
updated smokegen and verified qt4-perl will still build against it.  Since only 
one rdepend is actually affected by this transition, I think it'd be easier to 
just upload smokegen with the fixed symbols file, but no v5 package bump and 
then binNMU qt4-perl.  There's enough else going on that bending the normal 
way of doing things makes sense in this case (at least to me).

Scott K