Bug#791067: hdf5: library transition may be needed when GCC 5 is the default

[Simon McVittie]

On Sat, 18 Jul 2015 at 12:15:10 +0200, Gilles Filippini wrote:
> hdf5 in experimental have a soversion bump. From there I'm unsure about
> what to do right now.

This SONAME bump means the necessary rename has taken place in experimental.
What do you plan to do about unstable?

There are basically two options:

* send the experimental version to unstable, if you believe this to
  have a low risk of derailing the g++-5 transition, and in
  particular all the reverse-dependencies still build;

* do a "v5" rename in unstable, similar to
  https://patches.ubuntu.com/h/hdf5/hdf5_1.8.13+docs-15ubuntu2.patch

My advice would be to choose whichever of those you think is
lower-risk.

The release team have said[1] that starting the transition is OK for any
library whose library dependencies have all either started *their*
transitions, or been confirmed not to need transitions. hdf5
doesn't appear to depend on any C++ libraries except mpich, which
doesn't seem to be affected by this whole mess due to having a
simpler ABI than most C++ libraries - so I think hdf5 is ready
to go?

(If you require confirmation from the release team I can try to
get that, but I don't think they are going to be able to follow up
on each of the dozens of parallel transitions involved in the libstdc++
ABI change, which is why I'm trying to help keep things moving.)

Regards,
    S

[1] <https://lists.debian.org/debian-release/2015/08/msg00426.html>